List of Lab Rats episodes

When Leo and his mom, Tasha, move in with Donald Davenport, Leo's step-father, Leo discovers three bionic superhuman teenagers named Adam, Bree, and Chase living in a secret underground lab in Donald's high-tech home. He takes them to school, where their lack of experience with the outside world causes chaos, prompting Donald to ban them from ever leaving the lab. However, Leo, in appreciation for making him more popular by using their bionics, throws a party for the Lab Rats in Donald's house, only to get caught when Donald and Tasha walk in during the festivities.

After the Lab Rats disobey Donald's orders, Donald decides it is best they are sent to a top secret facility in the arctic. To replace them, Donald creates robot versions of them to hang out with Leo, but the Lab Rats switch places with the robots. However, Tasha decides that she does not want Leo to hang out with robots and tells Donald to recycle them, not knowing they were the real children. Once at the recycling plant, the Lab Rats use their bionics to avoid the various hazards, but must go back when Leo jumps in, hoping to rescue them, before Adam finds the off button. When Donald sees the children risk their lives for each other, he decides to let them stay, as long as they can control their glitches.

On the Lab Rats' first day at school, all goes awry when Chase is confronted by a football player and his "Commando App" is triggered, transforming him into Spike, a loud-mouthed, insulting bully with an enormous temper. When Spike stands up to Principal Perry, she puts the Lab Rats up against the football team to battle it out for the coveted cafeteria table. While the Lab Rats' bionics and Spike's aggression get them close to winning, Spike reverts to Chase at the last minute. While Chase tries to compute the perfect winning pass, he becomes confused by too many targets, causing them to lose. Meanwhile, Donald tries to work, but is constantly interrupted by Eddy.

When Leo needs help asking a girl to the school dance, Adam and Chase step in to help, but the plan backfires when she falls for Adam instead. The boys decide to settle their differences on the dance floor and they each show off their best moves. Meanwhile, Bree gets to know her crush, Ethan, but he gets to know that Bree is one weird girl.

Guest stars: Angel Parker as Tasha, Garrett Backstrom as Ethan, Ginny Gardner as Danielle

The Lab Rats get their first mission to stop Donald's high-tech, super fast train from speeding out of control. Leo sneaks along, but when the Lab Rats discover he accidentally discarded the braking system they were supposed to install, they must improvise a way to stop the train before it crashes into a nearby town. Meanwhile, Tasha is given her big break at the TV news station when her boss asks her to cover the runaway train. She passes the opportunity to see the train and fails the report. After Leo stops the train, Tasha finds out and grounds Leo for two weeks in his room without television, video games, and leaving the house, but Leo shortens his grounding to one week without Tasha knowing.

When Chase refuses to admit that Adam has good ideas, Adam decides to run against him for Student of the Semester. Meanwhile, Leo takes advantage of Bree's super speed and starts using her as his personal taxi.

Guest star: Garrett Backstrom as Ethan

Tasha's mother, Rose, comes to visit the family. Tasha must pretend that the Lab Rats are her staff. Meanwhile Donald's prized invention, a super strength and laser empowered exoskeleton suit, malfunctions, after Chase reverses its controls, to get back at Leo for stealing his presenting job. However, it ends up unleashing destructive power on the household, making Leo's grandma even more suspicious of the family. While Rose is not looking, the Lab Rats use their powers to stop the exoskeleton. Afterwards, Rose demands answers, and Donald tells her that Adam, Bree, and Chase are his brother's children, who he says he adopted after his brother fell into a volcano.

Guest stars: Angel Parker as Tasha, Telma Hopkins as Grandma Rose

When the Lab Rats forget to invite Leo to his own surprise birthday party, they must make it up to him, so they take Leo into the ultra-cool virtual mission simulator and show him what it is like to be bionic.

Leo teams up with Adam in the school fitness challenge Death Spiral Smackdown, hoping that Adam's bionic powers will be his secret weapon; the plan backfires when they end up going head-to-head in the finals. Meanwhile, Bree and Chase use their bionic abilities against one another when Chase tries to sabotage Bree when she is with her friends by making her speak French, Swedish, and many other languages and making her slap her face.

Guest stars: Maile Flanagan as Principal Perry, Tucker Albrizzi as Gordo

Leo borrows Donald's helicopter to take his crush, Janelle, on a flight date. Meanwhile, Bree gets her own bedroom and Adam and Chase are excited to have the lab to themselves; however, things get out of hand and Chase decides to divide the lab in half.

Future Leo travels seven years into the past to tell Leo that the Lab Rats will not make it to the future and that the only way to save them is to not let them go on their ultra-collider mission. The Lab Rats go anyway, since the whole world is in their hands. After young Leo goes after them and saves their life by pushing them aside when the dome collides, Adam digs up Leo who ended up saving every one of them. Leo misses his date with Janelle and Future Leo ends up with a dog instead of Janelle.

Special guest star: Tyler James Williams as Future Leo

The Lab Rats switch their bionic chips after Leo mentions such an idea. Adam has Bree's speed, Bree has Chase's intelligence, and Chase has Adam's strength. Ignoring Donald's warning, they go to school and Chase, not used to heat vision, accidentally traps Leo and Principal Perry inside an elevator during a drill as part of Emergency Preparedness Week at the school after Bree complains about the noise the fire alarm bell makes. Chase is unable to do anything, so the Lab Rats race home and try to switch back their chips, but it backfires—Chase ends up with Bree's speed, Bree ends up with Adam's strength, and Adam ends up with Chase's intelligence. Adam figures out that Bree can pull the elevator cables, lifting Leo and Principal Perry to safety. This works, but Donald busts them, though he is glad that they learned their lesson about chip switching.

When Donald and Tasha go on vacation, it is up to Leo to make sure that nothing happens to Donald's prized possessions. Leo and the Lab Rats all promise to behave, but once they leave, the Lab Rats start to fool around in the lab. At night, Leo turns on the LEMP, a "glitch machine," thinking it is a nightlight. In the morning, Leo wakes up to find that Adam is talking backward and Chase can only see pixels. They tell Leo that Bree began running in the night and that they do not know where she went. Chase uses the computer to track Bree. They fix their glitches, Bree runs home by using a map, and Chase finds out he tracked one of Donald's drones, forcing Eddy to steer the plane back. In the end, Donald grounds Leo and the Lab Rats.

The Lab Rats learn about chores and earn an allowance for the first time. In hopes of raising more money, the Lab Rats decide to host a yard sale, but they accidentally sell an antique jewelry box that Donald was restoring for Tasha. Meanwhile, Leo and Donald bond over the latest Pig Zombie movie. When Tasha finds out about her son disobeying her rule and lying to her and Donald, she grounds Leo and forbids him to watch television for a week, but Tasha later lets Leo watch the Pig Zombie movie marathon and she extends Leo's grounding to a month. Donald finds out about the jewelry box's disappearance and punishes the Lab Rats by making them do every filthy, disgusting chore in the house without their bionics for a month.

Tasha takes the entire family on a nice technology free beach weekend in the RV, but when Donald discovers a solar flare headed toward Earth, he secretly enlists the help of the Lab Rats. While Donald distracts Tasha, the Lab Rats are forced to wait in the RV for their rocket launch window. Cooped up inside during their first summer vacation, Leo and the Lab Rats sneak out for a quick jaunt on the boardwalk, but when they return the RV is gone. A policeman tells them he had the RV towed and the Lab Rats perform to get money so they can get the RV back, but they land in jail when they realize they do not have a license to perform.

When Leo wants to impress Janelle by beating school bully Trent in basketball, Chase lends him Donald's anti-gravity boots. However, when Trent steals the shoes, Chase gets a gadget that makes the shoes dance with Trent in them. Trent takes the shoes off, and in the second round, Leo scores a goal by himself. Meanwhile, Bree and Adam compete for a spot on the cheer-leading squad. Adam wins, but when Stephanie makes fun of Bree, Adam quits, and he and Bree make their own cheer and shame Stephanie and the cheerleaders out of the court.

Guest stars: Madison Pettis as Janelle, Eddie Perino as Trent, Oana Gregory as Stephanie

Leo desperately wants to be Donald's lab assistant, but he accidentally corrupts the smart-home system, turning Eddy into an evil demonic virus named Teddy. Meanwhile, Bree holds a sleepover with her friends, unaware that they only wanted to come because of the house she lives in, while Adam and Chase try to pull a prank on the girls.

After using their bionics to save Leo from a falling air conditioning unit, a suspicious Principal Perry catches the Lab Rats on video using their bionics, but she has not viewed the footage yet. In order to stop her from showing Donald and Tasha the film on parent-teacher night, Leo uses Donald's invisibility cloak to sneak into her office. However, after Leo gets caught, the Lab Rats must think of a new plan.

Adam and Chase befriend a new child, Marcus, from school. They form a band, but when Leo gets suspicious he joins the band, only to get blamed for breaking Marcus' guitar. Meanwhile, Bree plans to bond with Donald on Career Day, but gets upset when she finds out Donald had been planning something with the boys. Leo brings along a tablet with Eddy's home system recording installed on it, showing that he did not break Marcus' guitar, but before he shows everyone Marcus confesses and finally tells everyone the "truth." After a pretend breakdown, he then tells Leo to never tell on him again or else.

The Lab Rats are at school when Marcus asks them if he can stay at their house for the weekend because his dad is out of town and he does not want to stay with his grandma. They agree to let him stay. The Lab Rats discover they have secret abilities, but when they confront Donald, they find out that he does not know the type of ability they will have or the time it will come. When Marcus comes over, they have to go into space because Donald's satellite is about to get hit by a meteor shower due to a breach. They get there and fix the breach, but Adam accidentally breaks his tether with his heat vision. Marcus infiltrates the lab and places a microscopic spy camera inside. Later, Marcus notifies a mysterious man about his infiltration in Donald's lab.

The Lab Rats sneak out in Donald's new self-driving sports car. When Leo tries to stop them, his nemesis Marcus traps him inside the car and programs it to take him on a wild, high-speed ride bound for the bottom of the Pacific Ocean. In the end, Marcus reveals to Leo he is bionic like the Lab Rats and that if Leo tells anyone, Marcus will tell the world about the Lab Rats' secret. Meanwhile, Donald and Tasha try to celebrate their one-year anniversary, but Eddy keeps interrupting them.

Leo uses a robotic fly to mess with Bree, but he goes too far when he uses it to cheat off Bree's test. When Bree scolds Leo for copying, Principal Perry gives her an F for talking during a test. However, when Principal Perry finds and keeps Leo's robotic fly, she accidentally releases a swarm of them, which all paralyze the students, but the only way Bree will help is if Leo confesses he cheated. Leo confesses and Bree creates a tornado with her speed to capture the flies in the container. Meanwhile, Adam and Chase must take care of baby dolls for a class, but it ends up in a battle between them, with them hurting each other's babies in various ways.

Guest star: Maile Flanagan as Principal Perry

Leo wants to be a part of the team, but Donald will not let him. When Donald discovers a gas leak, he calls the Lab Rats, but they are stuck in detention with Principal Perry for missing school during their other missions. Leo goes instead, much to Donald's dismay. Leo soon proves to be worthy when he saves the day. In the end, Leo is officially a member of the team as someone who watches over the mission and gives ideas and advice. Meanwhile, Donald gives Eddy a body, which is broken on the mission.

While going on a mission to receive samples to bust criminals, Bree is exposed to some of the chemicals she is collecting when she is not paying attention. Adam, Chase, and Donald try to figure out what is wrong with her and how to undo it. Leo tries to make sure Bree does not reveal her bionics when she sneaks out to see her crush's art. At the art show, the side effects of the chemical Bree was exposed to begin to manifest.

Chase and Leo decide to enter a build-your-own-bot Robot Throwdown. When Donald wants to join their team, they let him, but they kick him off when he wrecks their robot. He then enters the competition himself, going head-to-head against Chase and Leo. Meanwhile, Bree accidentally exposes her bionics to Caitlin, who then leaves in a fluster. Caitlin confesses she has a crush on Adam and he becomes her boyfriend so that he can convince her she did not see anything. When Adam and Caitlin are on their date, Caitlin confesses she was wearing glasses and therefore did not see anything. Adam, who does not like Caitlin, becomes upset, which activates his bionics and Bree tackles Caitlin to the ground, both to protect her and to stop her from seeing Adam's heat vision. Later, Adam finally gets Caitlin off his back by showing her who her true crush is; however, her true crush does not really want to cooperate.

Chase pulls a prank on Adam, ending with Adam dislocating his arm. Adam then gets worried because the world is so dangerous. He quits the team because he does not want to get hurt. Chase and Bree realize they cannot do it alone, so Chase and Donald come up with a plan to get Adam back on the team, but things go wrong and Chase gets hurt. Meanwhile, Bree discovers her secret ability and gets grounded for using it to make fun of Principal Perry. Leo and Bree later get grounded at home.

Leo and the Lab Rats go on strike due to Donald's refusal to give them a day off. When he needs them for a special presentation, he must admit that he is wrong or risk his entire career, but he instead gets Leo to be his pilot for the presentation. However, little does Leo know that Donald is using him to get the Lab Rats to cave. In the end, Donald's presentation is blown and the Lab Rats forgive Leo.

One of Donald's inventions accidentally sucks Leo into a parallel universe, where the Lab Rats are powerless and Leo is the one with bionics and everything is backward. Tasha is a technology genius, Donald is her assistant, Principal Perry is nice, Adam is a nerd, Chase is a jock, and Bree is popular. The Lab Rats do not know Leo; when he exposes his bionics to them, which freaks them out, they tell the FBI. He and Donald have to get him back to his universe before Leo ends up in government lockdown.

Leo decides to enter the school talent show by performing a magic act. When Chase is not pictured on the yearbook, he uses his molecularkinesis in the talent show auditions to show everyone he is popular, but takes Leo's spot. Eddy gives Leo a device to interrupt Chase's bionics during the show. Chase gets booed, causing his Commando App to activate. Leo calms him down, but induces Spike again by insulting Chase. Leo tries using the device to shut Spike down, but ends up causing Spike's aggression levels to soar. Principal Perry then takes Spike down, reverting him to Chase. Meanwhile, Adam and Owen try to use butter as art, much to Bree's chagrin. Bree melts their butter statue of Principal Perry, upsetting Owen. She makes it up to him by making him a new statue out of popcorn.

Guest stars: Maile Flanagan as Principal Perry, Ben Stillwell as Owen, Will Forte as the voice of Eddy

After seeing Marcus at school, Leo follows him to his house. He gets photographic evidence that not only proves that Marcus is evil, but that he also wants the Lab Rats. Unfortunately, he is captured by Marcus and he orders his robot to kill him. Leo escapes by out-thinking Marcus with a move Chase used to beat Adam at arm wrestling. Meanwhile, the Lab Rats try out a teleporter, but accidentally teleport Tasha to Fresno and must fix the teleporter to bring her back. Adam reveals that instead of depending on the broken teleporter, he called Tasha and told her to ride a bus home. When Leo tries to bust Marcus, his phone is destroyed by the broken teleporter. Marcus's house appears normal except for a camera that Donald suspiciously notices, but does not mention. Marcus's dad reveals himself and says that Marcus has failed him and he will take care of Donald and the Lab Rats.

When Donald shows Leo and the Lab Rats his one-million dollar painting, they do not approve of it. While Donald is at work, Leo and the Lab Rats put the painting in Donald's art vault, which has a bunch of other paintings. When Adam sneezes, it triggers his heat vision which burns a hole into the painting. Leo and the Lab Rats then try to cover it up by painting a new one that looks exactly like the original. All does not go according to plan when the FBI shows up and accuses Donald of forging art and almost discovers the lab when looking for more forged art.

Adam gets his driver's license and Donald takes him to get a car; however, when Donald has to leave early, Adam gets a monster truck instead of the intended car. Donald is about to take back the truck, but he and Adam decide to keep it and take a joyride. Meanwhile, Leo is bragging about how he was invited to a party, but when Tasha runs for PTA president and embarrasses him, he worries he will be uninvited, so Bree uses her voice manipulation powers to make Tasha seem like she is making fun of Principal Perry, and Perry then decides to run against Tasha. In the end, Perry wins the vote when Adam and Donald accidentally crash the monster truck into the school.

Leo wants the corner locker at school, only to find out it has been taken by his neighbor Clayton Harrington. Meanwhile Donald has grown tired of Clayton's obnoxious ultra-rich father, Pierce, and decides to end their feud with a stock car race. However, he quickly finds out that he will need the help of Leo and the Lab Rats when his neighbor enlists the help of Joey Logano to win the race. Donald fires his pit crew, who have been paid by Pierce to sabotage his car, and Leo and the Lab Rats become his new pit crew. Joey later leaves because Pierce and Clayton sabotaged Donald's car and says he does not work for cheaters. Joey helps Donald win as well. Donald has a plan to stay behind and then slingshot past Pierce's car. In the end, Donald wins, Pierce and Clayton move out of the neighborhood, and Leo gets the corner locker.

After Donald only seems to point out what they do wrong, the Lab Rats get annoyed with him. Meanwhile, Marcus disables Eddy and he and his dad, Douglas, who is Donald's brother, capture Donald. Using Donald as bait, they lure the Lab Rats to their lair. Marcus, who has enhanced forms of all their powers, defeats Adam and Bree easily. Chase uses a new ability, levitation, and Marcus feigns defeat. Douglas transports them into Donald's cage and says that he is their father. Donald and Douglas jointly founded Davenport Industries, but had a falling out after Douglas went behind Donald's back and implanted bionics which they had designed for robots into human subjects (Adam, Bree, and Chase). Douglas then built Marcus, an android. Douglas created Adam, Bree, and Chase with a Triton App so that he could control them, but Donald disabled the app shortly after he took the bionic siblings away from him. While Douglas works on an override to reactive the Triton App, Leo arrives and Marcus seemingly kills him with an electric bolt. The Lab Rats deactivate the cage using a granola bar wrapper and Donald's custom belt buckle. Donald and Douglas fight over the Triton App remote. Marcus defeats the Lab Rats, but Leo arrives in the exoskeleton, having been wearing a Davenport suit which saved him from Marcus's earlier attack. Donald crushes the remote, while Marcus knocks Leo down and prepares to kill him. Adam gets angry and unlocks a hidden ability, a bionic blast wave, which destroys the lair and knocks Marcus down. Douglas escapes, but Marcus is crushed by a mountain of rubble, and the Lab Rats help each other get out. Donald says he is proud of them and Chase says that Donald is their real father.

Guest stars: Jeremy Kent Jackson as Douglas Davenport, Mateus Ward as Marcus, Will Forte as the voice of Eddy

After Donald catches Leo and the Lab Rats coming home two hours past curfew and grounds them for three weeks, they use Donald's memory-erasing device to make him forget that he grounded them. However, Leo goes too far and accidentally erases 24 years instead of 24 hours, rendering him a teenager. When Chase tries to fix it, he wipes Donald's memory again to 24 years as a four-and-a-half-year old. When Donald discovers that Leo and the Lab Rats were using his memory-erasing device after he returns to normal, he grounds them "forever".

Adam and Bree are always saying that super speed and super strength always make a good team, so Chase tries to prove to them and Donald that super smarts can be good on its own. Meanwhile, Leo accidentally freezes Janelle and Tasha with Donald's freezing gun. Donald arranges for the Lab Rats to go on a mission in Antarctica, but calls it off because he thinks that it is going to be too dangerous. Chase goes, anyway, wanting to prove to Adam and Bree that he can complete a mission by himself and ends up getting trapped by an avalanche. He is rescued by Douglas, who presents him with a tempting offer to work together. Chase pretends to agree, but freezes Douglas in the end.

When the Lab Rats are completing their training, Adam gets bored of training and wants to have fun. He creates a duplicate of himself with Donald's cellular duplicator; however, things get out of hand when the duplicate learns how to multiply himself. Meanwhile, Bree and Chase have to babysit Principal Perry's niece who acts nice, but is actually blackmailing them.

Guest stars: Maile Flanagan as Principal Perry, Grace Kaufman as Kerry Perry, Will Forte as the voice of Eddy

When the school mascot’s Dingo costume is stolen by the rival team, Adam seeks revenge by taking their mascot, a llama. When Chase and Adam try to return the llama, they discover that the animal has swallowed hundreds of Donald's mechanical nanobots, causing it to shoot acidic bionic spit. Meanwhile, Caitlin gets Leo and Bree to help her win the school's domino contest, but she is too hard on them and Bree and Leo decide to compete against her.

Guest stars: Maile Flanagan as Principal Perry, Michaela Carrozzo as Caitlin

After Principal Perry tells everyone a ghost story, Adam, Chase, and Leo decide to take advantage of Trent's fear of ghosts for a little revenge. However, they soon start to believe that the ghost is real. Meanwhile, Bree and Owen have different opinions on how to decorate the gym for the homecoming dance. In the end, it turns out that Principal Perry was behind the whole thing.

Guest stars: Maile Flanagan as Principal Perry, Eddie Perino as Trent, Ben Stillwell as Owen

Davenport makes a deal with Principal Perry to improve the school technology, even though Chase and Leo tell him not to. In the end, his ego ruins everything when he makes a robotic version of Principal Perry. Leo and Chase are mad at him, so they make the robot Perry unfocused while unknowingly restoring the robot to its original factory settings: seek and destroy. Meanwhile, an Irish foreign exchange student named Alistair arrives at the school, and Adam and Bree become convinced that he is another android like Marcus who has been sent to spy on them.

When Chase inadvertently causes Adam to shrink down to two inches, he takes advantage of the situation to get back at Adam for all the times he called him short. However, he begins to regret it when he loses him. Meanwhile, Bree gets control of the school for a day, but finds it hard to handle when Principal Perry decides to act like a student. Later, Bree calls Principal Perry's mom and it is revealed that whenever Principal Perry sees her mom she acts like a child.

Guest star: Maile Flanagan as Principal Perry, Peggy Miley as Mother Perry

When Bree gets tired of always being pranked by Adam and Chase, she asks Donald for help. Chase and Adam's pranks get out of hand when Tasha gets sprayed in the face with ketchup and mustard. Tasha and Bree later prank them back. Grandma Rose comes to visit and begins to interfere with Leo and Janelle's relationship.

The Lab Rats go on a mission to save Dr. Evans on Christmas Eve due to a large volcanic eruption in the frozen tundra. After aiding Dr. Evans in stabilizing several of his machinery, an aftershock causes his gamma-sphere to crack. Chase has to use his force-field to contain the highly dangerous gamma rays. Meanwhile, Principal Perry stays in Donald's mansion and makes Christmas miserable for Leo. In the end, she makes up for it by making a beautiful dinner for them.

Trent asks for help on his test from Chase and Leo, and they decide it is a good chance to get back at him for picking on them. They program Donald's educational Daven-glasses with fake information and Trent fails the test. Principal Perry tells them that Trent would have graduated if he passed the test and they convince her to let him take it again. They help him study for real this time, using Leo's pain as inspiration. In the end, they find out Trent is now their gym teacher. Meanwhile, Bree wants to look good in her yearbook photo, so she goes to the hair salon. Adam accidentally burns off half of her hair, and they ask Donald to fix it. Adam causes another mess by putting too much hair growth cream on Bree. On Picture Day, her bangs grow over her face when Principal Perry takes the photo.

The Lab Rats are forced to expose their bionics to save Principal Perry's life. Meanwhile, Donald is attacked by a mysterious hacker. The hacker later uses all of Donald's credit cards and hacks his computer networks. When Donald loses the house, the Lab Rats then run off to hide from the FBI. It is later revealed that Douglas is the hacker and that he was released by a mysterious masked man with bionics. Later, Douglas sets off explosives in the lab. Leo and Donald escape, but are stuck in the elevator with no way out.

Leo and Donald escape the elevator. Principal Perry lets them stay at the school temporarily in order to get her money from Donald quicker. The Lab Rats stow away on a cargo ship to hide from the FBI and must choose to either keep quiet or help stop a submarine that will crash into the ship and risk being caught. The Lab Rats decide to stop the submarine, with Chase activating his GPS, revealing the Lab Rats' location. Douglas ends up capturing them, disguised as Donald. Douglas reveals that his new bionic partner is a billionaire named Victor Krane, who wants to destroy the Lab Rats permanently. When Donald calls the Lab Rats and tells them that Principal Perry kept their secret, they return home, only for them to get crazy as a result of the Triton App and attack the family, Leo manages to disable Chase's Triton App when he talks to him and Chase manages to disable Adam and Bree's apps. The Lab Rats and the family later see the demolition that happened to the lab and are upset.

Since the lab is destroyed, the Lab Rats go without their capsules. This causes glitches in their bionics. In order to prevent this, Donald pulls off a huge stunt in a fiberglass jet wing he invented. Things go wrong when the jet wing runs out of fuel. Meanwhile, knowing the Lab Rats' bionic secret, Principal Perry uses Adam and Bree as her bionic servants for the day.

Since Principal Perry knows that the Lab Rats are bionic, she wants to get in the action and go on a mission with them. When they stage a fake mission and take her down to the newly built lab, things don't go as planned, and they have to save Mission Creek High from a speeding rocket. Meanwhile, Janelle goes on a date with Leo, but is beginning to see him as a jinx because she always gets hurt when he is around.

Bree gets a part-time job at a tech-support store with Caitlin, but gets out-shined by Chase while he is talking to the manager of Tech Town, Scott. Chase sees how she feels later and they agree to treat each other with respect. Meanwhile, while Tasha is away visiting Grandma Rose, Leo and Adam make a turbo zip-line instead of doing the chores that Tasha gave them, with Donald joining them later. When Tasha finds out about the zip-line, she makes the boys do the chores and she hangs out on the turbo zip-line instead, much to the dismay of Adam, Leo, and Donald.

Chase loses the phone with a bowling video of him and Adam doing bionic bowling stunts at Tech Town while working. Leo and Bree try to get Principal Perry to spend her money when she retires after Donald gives her money and Trent becomes the principal and makes Leo's life miserable. It works in the end, but Principal Perry is broke and Scott fires Caitlin after she destroys an ePhone 7, the one that had Adam and Chase's bowling stunts on it, while giving them to the customers as revenge. Leo makes Trent wear a different uniform, but to Bree and Leo's shock, he loves it, much to their dismay.

Leo invents his first high-end technological creation, a pair of attack orbs meant to protect the family, but when they can't differentiate between friend and enemy, they create more bad than good. Meanwhile, Chase steals Donald’s Eddy technology to make a Cheddy application to win a Tech Town employee contest and beat Scott, but things go wrong when the technology doesn't work as expected. Leo and Tasha go to see Janelle's play which Adam is starring in, but when Trent steals Leo's ticket, Leo and Trent ruin her play, much to Adam and Janelle's dismay.

During a lunar eclipse, Principal Perry arrives at the house to inform everyone that aliens are on the planet, much to the cha Bree, Chase, and Donald's chagrin, but Adam and Leo's shock. She insists that Chase's upset stomach is due to an alien growing inside him and chases him. However, they notice green goop leaking out of Principal Perry's ears and mouth. Donald then admits that she's an alien. Principal Perry chases everyone, while Leo records the whole thing, and eventually tires herself out. Leo accidentally wakes her and she runs off with him to the school. Adam's heat vision destroys the alien pods Principal Perry laid and Leo is freed. The mother ship beams Principal Perry away just as Donald arrives. Thinking that they will miss Principal Perry, they are sadly mistaken when the mother ship beams alien-less Principal Perry back down. It is then revealed the whole thing was Leo's entrant in a contest.

Donald shows a new motorcycle to the Lab Rats when they get a video message from Douglas that Krane has lost it and implanted himself with more bionic abilities, abilities even he doesn't know about. The Lab Rats instead believe this to be a trap, leading Donald to activate a new security system that only he can bypass. While Leo is at Mission Creek High School, Douglas arrives and tries to appeal to Leo by reminding him that he knew about Douglas and Marcus before the rest of them. Douglas then shows Leo video footage of Krane implanting himself with bionics and asks him to call his brother to prove his honesty. Back at the lab, a transmission comes in and shows Leo and Tasha captured. While Donald thinks it's Douglas, Krane reveals himself on-screen as the captor and demands that the Lab Rats arrive in 10 minutes. While the Lab Rats want to rescue them, Donald heads out alone with an extremely powerful thermal blaster. Donald arrives at Krane's lair, only for Krane to siphon the power from the blaster, rendering it useless and quickly beating Donald with super strength and molecularkinesis. During the battle, Leo and Tasha are trapped in an exothermic energy field to fry them. Afterward, Krane geo-leaps to the lab, allowing Donald to use the thermal blaster to suck in the heat to set Leo and Tasha free. As Chase works to deactivate the security system, Krane arrives and easily beats the Lab Rats with his more advanced bionics. Before Krane can finish them off, Douglas arrives and blasts Krane with a laser blaster. Although he saves the Lab Rats, Krane quickly recovers and knocks him down with another force wave. As he once again prepares to attack, Chase repels his blast back at him with a force-field, defeating him for good. Douglas plans to capture the unconscious Krane, but Donald arrives and blames the entire mess on him. Unfortunately, Krane geo-leaps out of the house and Donald demands that Douglas leaves.

Bree is accepted for a semester abroad program in Australia, but when Donald learns about it, he refuses to let her go. When Donald again refuses to let her go to a concert with her friends in favor of bionic chip maintenance, she decides she's had enough and smashes her bionic chip, much to Adam, Chase, and Donald's horror. At first, Bree relishes her new freedom and even begins bragging to a disgruntled Leo. During a mission, Bree feels helpless as Adam and Chase are gone for hours. Chase reveals that they barely made it out alive and because Bree is no longer bionic, the mission took twice as long. Bree realizes she was selfish and apologizes to Adam and Chase. She's ready to become bionic again, but Donald sadly tells her that since Douglas built the chips, he isn't sure if Bree will ever be bionic again. Meanwhile, Tasha is sick, so Leo decides to use his new pill invention on her to see if her diagnosis will reveal the problem, but when he takes some of the software from Eddy, Eddy is stuck in Tasha's body. Eddy spends the day dressing her horribly and getting her kicked out of every spot in town. Donald finally uses his nasal vacuum on Eddy and the pill is extracted. However, Eddy reveals he did a news report as Tasha, and much to her shock, he made her look like a complete buffoon.

As Donald attempts to repair Bree's damaged chip, the replacement chip keeps malfunctioning, much to Donald's frustration. Although Leo believes Douglas can help since he was the original creator, Donald refuses to even see his brother again. Realizing Donald won't change his mind, Leo finds Douglas, anyway, who reluctantly agrees to help. While Donald is away, Douglas creates a new chip as close to the original as possible, and though it seems to work, it also malfunctions by causing Bree to run uncontrollably. Donald finds Leo with Douglas at the lab, but helps out and all three manage to keep Bree still; however, they still can't find a solution. After several minutes, they finally find the error and collaborate for the first time in years, fixing Bree's chip and saving her life. Meanwhile, Adam and Chase try to find a way to replace Bree's speed. While Chase manages to power up Donald's motorcycle to go 350-400 MPH, it runs out of gas almost instantly. After Bree's chip is fixed, Donald still kicks out his brother. While watching Bree apologize for her mistake, Donald realizes everyone deserves a second chance. The next morning, Donald offers his brother a chance to move in with them temporarily, and he accepts.

Leo's scared by a shark movie, so Adam and Chase use one of Donald's sharks to scare him, but it goes haywire and Adam, Chase, Leo, and Janelle end up stuck in the house. In the end, Leo turns the sharks off. Meanwhile, Principal Perry enlists Bree and Donald's help to get into a country club, but when she lies that Donald is her husband and Bree is her daughter and they have pottery around the world, Bree must use super speed to go places without the country club owner knowing about her bionics. Eventually, Principal Perry doesn't get in after the manager figures out the lies, but she decides to spend the summer with the Davenports.

When the Lab Rats are on a mission, it is revealed that a girl was secretly recording them behind a bush. The next day, the Lab Rats go to school and everyone is looking at a viral video called The World's First Bionic Humans. They go back home to tell Donald, but he says he already knows. Meanwhile, Chase is confused that he didn't notice the girl who filmed them behind the bush, even though he thermal scanned the whole place. He then looks at a chip log and finds out that the girl was in the exact spot he scanned. Chase then goes to tell Donald, but a swarm of government agents surrounds them. Leo and Douglas are still in the lab, but they use a trap door to escape and go to school to stay safe. It is then revealed that the mission the Lab Rats were on was a setup. Krane then shows up with the girl who filmed the Lab Rats, whose name is revealed to be S-1. It is also revealed that she is bionic. Krane electrocutes Principal Perry and Douglas while S-1 crushes Leo's arm. Later, Douglas and Principal Perry help Leo to get his arm fixed and take him to the hospital. Tasha later shows up, only to realize that Leo is gone. While the Lab Rats are saying their goodbyes, Special Agent Graham tells them it's time to leave, but Adam refuses. Agent Graham orders his agents to take them down, but Adam uses his wave blast ability to knock them down. When they run to the hospital, Principal Perry tells them Krane is responsible for exposing their bionics. Meanwhile, Leo is in Douglas and Krane's old warehouse and Douglas tells him to take his bandage off and pretend to throw a ball. He then realizes that Douglas upgraded his right arm with bionics. Krane then shows up and knocks down Leo and Douglas. The Lab Rats then show up with Donald, as Krane uses a powerful bionic ability that knocks out Leo, Donald, and the Lab Rats. Krane then paralyzes Donald with his choking ability. Bree battles S-1 while Adam and Chase battle Krane, but he easily takes them down with his newly upgraded Triton App that he uses on S-1. Leo then uses his bionic arm to take down Krane. As Agent Graham arrives, Douglas reveals that Krane and S-1 are the bionic villains. Agent Graham is then saved by Bree as Krane tries to attack him and he takes Krane and S-1 into custody and locks them in a prison with a bionic signal interrupter, preventing them from using their bionics to get out. Later, the Lab Rats are at a press conference and reveal that they are bionic superhumans. While watching it, Principal Perry makes new friends with the Lab Rats. In the end, Agent Graham tells Donald he's now in charge of the Lab Rats. It is also revealed that Krane has an army of bionic soldiers, which he will use to destroy the Lab Rats.

Leo tries to show off his bionic arm to Janelle. Meanwhile, Agent Graham promotes the Lab Rats as bionic celebrities, but when they realize they missed a mission because of him, they decide to get Donald back as their leader by pretending to have glitches in their bionics to humiliate Graham in front of the President of the United States when he comes to visit them. In the end, Donald is back as their leader after Agent Graham is fired by the president, arrested by the Secret Service, and sent to prison.

Guest stars: Jeremy Kent Jackson as Douglas, Madison Pettis as Janelle, Ben Bodé as Agent Graham, John Eric Bentley as President

Donald and the Lab Rats attend a fan convention about the movie, Alien Gladiators. The Lab Rats queue up to meet Andre Ethier, but Caitlin comes and makes them let her cut in line in front of them, getting the lost spot and meeting Andre Ethier. They fight with Caitlin and are thrown in a security holding area with a fanboy. Meanwhile, Leo and Donald are taking part in the Fire Staff Competition to get the walk-in role in the next Alien Gladiators movie.

Chase feels that it is unfair to be picked on by Adam every time and tells Donald. Douglas overhears and unlocks a new ability for Chase, upsetting the balance in the house. Douglas tries to fix things by giving Adam a new ability as well, but Adam and Chase end up fighting with one another. Meanwhile, Bree tells Leo about a contest at Tech Town as they are about to hit their one-millionth customer and Leo competes to ride on the first anti-gravity roller coaster and meet the owner of Tech Town. Principal Perry tries to compete to crush Leo's dream. In the end, Chase and Adam have a death battle, but eventually forgive each other and find out that Douglas gave Bree the ability to go invisible, scaring everyone in the lab.

Chase gets a girl interested in him, but Adam gets jealous and tries to ruin their date by having Chase turn back into Spike. Meanwhile, Leo and Bree suspect that Principal Perry has murdered a cook from the cafeteria and Donald. They then find out it was about a hamburger truck and they misunderstood everything.

Bree wants to get revenge on Adam for embarrassing her in front of her boyfriend, Jake. Working with Chase, she puts on a cyber cloak that makes her look and sound exactly like Principal Perry and embarrasses Adam in front of the whole school. However, when she shows Adam the cyber cloak right before the dance that night, it glitches and won't come off. Bree then makes Chase wear a cyber cloak of herself and go to the dance with Jake. While that's going on, Leo and Douglas snoop in Donald's briefcase and compete for what they think is to be his new vice-president, only to find out it was for the Davenport Industries softball team. Donald then finds out that he had two cyber cloaks missing and deactivates them. This embarrasses Chase and gets Bree into trouble with Jake. She then thinks she's patched things up with Jake, but it's really Principal Perry wearing a cyber cloak.

During Christmas, when the Lab Rats discover that their new action figures are being outsold by another toy, The Nerble, they attempt to improve their toys by adding special features. After adding them they decide that the toys are too dangerous for kids and put them in a box to be destroyed. Tasha is running a toy drive at the school and is collecting gifts. She finds the action figures and hands them out. When the Lab Rats find out, they rush to school and try to catch the action figures. After destroying the toy drive, they find a way to make it up to Tasha and the kids. Leo and Donald have a snowball fight in the house and Grandma Rose shows up just as Leo uses his bionic arm. Rose gets mad and calls Donald a bad father. Donald tries to makes it up to Rose by giving her a Bree action figure, but it promptly explodes.

The Lab Rats plan to gain good publicity by having cameramen film them during a mission, but it turns into a disaster when they fight for screen time. After the mission, the president orders the team to stay away from the public in order to let him settle things down. However, it goes wrong when Leo and Principal Perry are holding back angry protesters who want the Lab Rats gone, and Leo accidentally uses his bionic arm. As the protesters become even more enraged, they try to storm the house; Adam panics and uses his bionic super breath to blow everyone off the premises. However, Chase criticizes Adam's actions and the Lab Rats start fighting. They eventually decide to break the team. Three weeks later, the Lab Rats refuse to talk to each other, but they are forced into action when Krane plans to use his Triton App on everyone in the world. A large battle ensues, pitting Leo, Donald, Douglas, and the Lab Rats against Krane and his bionic army. Most of the soldiers attack Adam and Bree, who manage to take them out. Chase has a one-on-one battle with S-3 and Leo has one-on-one battle against S-1. Donald and Douglas attack the soldiers surrounding the satellite, but Krane keeps them from getting too close. Eventually, the Lab Rats and the rest of the team manage to hold back many of the soldiers, but they are running out of time to stop Krane. Douglas then reveals that the Lab Rats can fuse their abilities to stop Krane. They succeed, blasting Krane into the sky and breaking his control over the soldiers. However, their victory is cut short when they find out that Donald is in serious condition after the battle. Later they find out that after the surgery, Donald is still in a very delicate condition. Leo is made an official member of the Lab Rats and gets an upgrade to his bionic arm.

Donald is in critical condition after the battle with Krane and his soldiers; Leo visits him in the hospital and in an attempt to save him, he risks his life to perform a dangerous bionic process, accelerating his aging process, thus turning him into an old man. Meanwhile, after being deactivated from the Triton App, Krane’s former bionic soldiers have nowhere to go and follow Adam home. The Lab Rats try to protect them because they aren't evil anymore. However, the president doesn't get this and tries to have them arrested, but changes his mind when the soldiers use their powers to heal and save Leo who almost died of old age. Right when they are going to be taken into custody, a newly healed Donald strikes up a deal with the president to build an academy for the soldiers.

Leo finds out that he will be a student at the bionic academy, not a mentor like Adam, Bree and Chase. Chase engages in a battle against a former nemesis and Adam mentors a younger student.

Donald leaves the Lab Rats in charge of the bionic academy while he celebrates his anniversary with Tasha. Leo invites Janelle to the island, but gets distracted by his nemesis, Spin. Spin challenges Leo to a bionic battle. Meanwhile, Adam tells Bob to do all the things he can't do when Donald is around. Bob goes ahead and steals Donald's plane, but he then hits a button that deactivates the auto-pilot. Sebastian and the Lab Rats work together to save Bob. Back at the bionic battle, Leo tries to impress Janelle by battling with Spin. Spin gets the first attack and knocks Leo over. Leo then fights back and hits Spin in the leg. Janelle rushes over to Spin, who is crying, and helps him up. Janelle gets upset at Leo and takes Spin to get a smoothie. It is then revealed that Spin faked the injury so Janelle would spend time with him. Leo tries to prove that Spin is faking it by taking his crutches. Janelle then yells at Leo and carries Spin away. Leo tries again by filming Spin admitting faking the injury, but Spin then smashes Leo's tablet. Janelle walks in and yells at Leo and Spin. Leo and Spin then become her servants and they must give her the vacation that she deserves. Later, Adam uses Donald's jet wing to fly up to the jet and save Bob. When Adam tries re-activating the auto-pilot, the plane begins to fall. Adam helps Bob conquer his fear of heights by jumping out of the jet. Bob takes Adam's parachute and Adam jumps out to try to get it from Bob. At Donald's house, just as Donald finishes setting up the table, Adam and Bob fall through the ceiling. Donald is disappointed with the Lab Rats. Adam confesses and tells him that he wasn't a good mentor. Bob tells Donald that Adam was a good mentor by boosting his confidence. Donald then tells him that his plane was a smart plane that even without the auto-pilot the plane would land itself automatically.

When Leo is chosen for a mission over Spin, Spin recruits Bob to join him on an unauthorized mission to prove themselves. They both end up stuck in quicksand and call Leo to save them. After Leo rescues them, Donald decides to move Leo up a color. Meanwhile, Principal Perry returns saying that she wants a job as head of security at the academy. After countless attempts, Donald agrees, leaving Leo in a particular despair. Meanwhile, Sebastian tries to help Chase get revenge on Adam with a virtual reality machine. After that, Chase tells him about his creator and how they took him out. Later, Sebastian injures Donald with the machine used to prank Adam. When the Lab Rats take Donald to the medic, Sebastian turns evil and says that if they took away his father, then he is going to take away theirs.

Sebastian has secretly formed an evil rebellion to get revenge on the Lab Rats for destroying his father. Meanwhile, Leo is trapped with the other bionic people who also want revenge, but Leo manages to convince Spin and Bob to help him, and, in the end, Sebastian is defeated, his rebellion is brought down, and he and his comrades are taken to a facility. Meanwhile, Donald successfully convinces the others that he has the best interest for them at heart while Adam still blames Chase for everything that happened after the rebellion is over.

After sneaking some students off the island and to the mainland, the Lab Rats accidentally leave Spin and Bob behind and must retrieve them before Donald finds out. Meanwhile, Donald tries on Chase's mission suit and he and Leo scramble to get it off before Chase gets home.

When suspicious events happen overnight on the bionic island, everyone is convinced a new threat has emerged. However, this threat is revealed to be Leo, when his bionics glitch because Douglas never gave Leo a capsule.

Guest stars: Maile Flanagan as Perry, Jeremy Kent Jackson as Douglas, Grace Kaufman as Kerry Perry

Adam brings a dog back to the island and Douglas reveals that it's his old dog, Otis, who Douglas made bionic in order to save his life when Otis was injured. Chase turns out to be allergic to dogs as he starts sneezing, so Douglas says that Otis has to leave, but he and Adam actually hide the dog. Meanwhile, Leo gets a new smartphone application assistant named Shelly, with whom he has fallen in love. Bree finds out and tells Leo how unhealthy it is. When Leo leaves, Bree tries to delete Shelley, but accidentally changes the settings from Shelley to Liam and is soon seduced by him. Leo hears Liam talking and realizes that Bree changed Shelly into Liam, and gets mad. Suddenly, there is an explosion in the weapons storage area and Douglas is injured. Adam, Chase, and Otis go to the weapons storage area and help Douglas up and Chase finds a tripwire. Chase goes to review the footage of the weapons storage area and shows Douglas and Adam that it was Otis who set the tripwire. Douglas and Adam don't believe him at first, saying that Chase is jealous of Otis and made the footage up. After a while, Otis goes to Adam and activates his Override App, which makes Otis able to control Adam. Douglas and Chase try to stop Adam from acting crazy. When Otis starts shooting heat rays from his eyes at Douglas and acting hostile, Chase scans Otis' bionic chip and tells Douglas that he has an override ability. Douglas says it must have been Krane who reprogrammed Otis to destroy Douglas after he betrayed Krane.Douglas is able to extract the chip from Otis. Bree and Leo come out of a room still fighting and they accidentally drop the phone. Otis pees on the phone, which short circuits it and causes Bree and Leo to stop fighting and walk away from the phone.

Guest star: Jeremy Kent Jackson as Douglas

The Lab Rats are on a mission to save people from a wildfire; when the people start to chant Adam, Bree, and Chase's names, Leo gets jealous and wants to become known. Douglas gets put in charge to develop a new technology for the academy, but can only come up with things that can hurt the students. Douglas gets an idea for a lie-detecting chair. If a person lies, they are spun in the chair at mach speed. Bob then unintentionally annoys Douglas by suggesting ideas for things that have already been invented. Later, the Lab Rats get a mission alert. When they arrive at the site, they find an old lady who claims her cat ran up a tree, but it is actually a raccoon. Her cat is on the ground next to her. Then five more mission alerts come up. Back at the academy, after 15 straight missions and none of which were actual emergencies, Adam, Bree, and Chase find out that Leo had made 10,000 business cards and a commercial in English and Spanish for a bionic emergency rescue service. Getting mission alerts from all over the country, Chase decides not to go because at least half of the alerts are not emergencies. Leo feels he needs to fulfill his promises and save people, so he goes on a mission alone. As Bob continues to drive Douglas crazy, he and Spin see all the mission alerts and start answering calls. Arriving at the mission site, Leo finds a helicopter about to fall over a side of a building. Using his super strength, he tries to pull the helicopter back down, but it is too heavy. Calling Bob for help, Leo gets put on a 20-minute hold. Adam starts to help Spin and Bob answer calls and picks up Leo's second call, but hangs up. Chase finds out from Adam that Leo called and rushes to the site of Leo's call. Arriving with Adam and Bree, Chase stabilizes the helicopter, while Bree helps the passengers out. When she goes back to check for anyone else, her suit gets stuck and the helicopter starts to fall. Leo grabs a hold of her just in time and realizes that it is not about the fame, but about saving lives. Douglas uses the technology from the lie-detecting chair to tell if the mission alerts are real or not.

Guest stars: Jeremy Kent Jackson as Douglas, Max Charles as Spin, Brandon Salgado-Telis as Bob

When Leo is injured during a mission, Tasha rushes to the academy to take care of him. After finding out what happens on missions, she bans Leo from joining any more missions, but he disobeys her and goes on a mission with the rest of the team. When Tasha finds out, she kicks Leo off the team and tells him that he is moving back to Mission Creek. Meanwhile, Caitlin also appears and Bob immediately becomes attracted to her. Bree tells Chase that she is mature now, but she fights over Bob. In the end, Bob tells Bree he only liked Caitlin to see if Bree liked him. Later, Tasha and the Lab Rats are having a home-cooked dinner in the mentors' quarters. Suddenly, a category five hurricane comes in. Bree and Chase rush down to help the students. Tasha thinks it is another trick and almost dies. Leo rescues her and proves that he has a place on the team.

Guest stars: Angel Parker as Tasha, Brandon Salgado-Telis as Bob, Michaela Carrozzo as Caitlin

Chase and Douglas reanimate a prehistoric sea spider. It escapes and bites Adam, which poisons him. It then grows and becomes 50 feet long due to growth hormones that had been given to it by Douglas. Everyone tries to stop the spider so they can create a cure for Adam.

Guest star: Jeremy Kent Jackson as Douglas

Douglas finds out that there is a student named Kate with the Commando App. Chase tries to activate her Commando App, named Spikette by Douglas, so he can research her. When he starts fighting with Adam, she activates her Commando App and thinks Chase is her baby. While she destroys the bionic academy, Bree forces Chase to activate his Commando App by embarrassing him so he and Kate can battle. Unfortunately, he teams up with her. Douglas gives Bree a Commando App and she and Kate begin battling each other. Bree wins and Douglas extracts Kate's chip. Chase apologizes to Kate and finds out that Douglas replaced her Commando App with sonic screaming.

Guest stars: Jeremy Kent Jackson as Douglas, Liana Ramirez as Kate, Mar Mar as Reggie

Chase and Donald have invented a new technology that takes in energy from any environment. Chase feels that he does not get his share of spotlight when Donald sells the product without his approval. Meanwhile, Kaz comes to the bionic academy to get powers, bringing Oliver with him. Chase decides to make a deal with another company when its CEO comes to buy the product. The person turns out to be a villain called the Incapacitator, who wanted to steal the product for his own use. The Lab Rats find out that Kaz and Oliver are not bionic heroes. Tecton, Gamma Girl, and Grey Granite arrive when finding out that the Incapacitator has come here. Leo has the same energy transfer power as the Incapacitator. The Lab Rats later find out they are real superheroes. The Incapacitator blasts and injures Chase. Kaz, Oliver, and the other Lab Rats take him to Mighty Med. Kaz switches brains with Chase to find out what problems Chase has. Chase's injury has created a hardware virus in his bionic chip, causing the chip to generate plutonic energy. He is stable for now, but if his blood pressure gets too high..... he will explode. Meanwhile, the others go to find the Incapacitator. Skylar tries to get in the middle of the romance that Bree and Oliver form. They go to the Eiffel Tower to find that he is in Las Vegas. Kaz tricks the Incapacitator to absorb Chase's virus and the Incapacitator explodes. Chase and Kaz switch brains back and Bree stops liking Oliver after she finds out that he resembles Chase. The Lab Rats then depart from Mighty Med hospital to go back home.

Starring: Billy Unger, Spencer Boldman, Kelli Berglund, Tyrel Jackson Williams, Hal Sparks, Bradley Steven Perry, Jake Short, Paris Berelc

Guest stars: Jilon Vanover as Tecton, Damion Poitier as Incapacitator, Carlos Lacámara as Horace

Donald's top scientist, Dr. Ryan, arrives to test Chase's invention. The two of them dislike each other and don't get along. When Donald puts Dr. Ryan in charge of the space elevator, Chase immediately gets jealous. Donald then makes Chase Dr. Ryan's assistant. Dr. Ryan puts Chase in charge of screwing in the lug nuts, but Chase refuses, and Dr. Ryan builds the space elevator without Chase. The day of the launch, Chase performs a bionic scan of the elevator and finds a major braking flaw on the elevator. Chase tells Leo and they agree to keep it to themselves. Donald then decides not to use the test dummy and says that he should test out the space elevator. Chase and Leo try to convince Donald to not go, but he can't hear them since the space elevator's walls are soundproof. After the space elevator takes off, Chase tells Dr. Ryan that there is a design flaw with the braking system. The two of them work together to safely get Donald back on the ground. Working together they reversed the charge and the elevator begins coming down ten times as fast. Leo decides to stand under the elevator to stop it from hitting the ground and killing Donald. His plan works until Donald approaches all of them and tells them that he used the emergency parachute to escape. Leo then gets stuck holding the space elevator until he tries to escape and it drops, crushing his leg. His leg is broken so badly that he needed a titanium rod put in. Instead, Donald does the procedure himself and gives Leo a bionic leg.

Douglas tells the group that his old college ex-girlfriend, a film director named Giselle, will be making a film titled Bionic Action Hero based on all of them and starring an up-and-coming actor named Troy West. Giselle and Troy visit the island to learn about the bionic team. Bree immediately falls for Troy. Douglas mentions to Giselle who Marcus was and says he was Douglas' greatest invention who had the combined abilities of Adam, Bree, and Chase. Giselle is intrigued and wants to meet him, but Douglas says she can see parts of him. In the mentors' quarters, Troy explains to Bree that he needs to figure out how Chase's abilities work or Giselle will fire him from the movie. Bree uses a computer to download all the information about Chase's bionic chip and gives it to Troy. He leaves Bree behind to give the file to Giselle who conspires to eliminate the Lab Rats and start her own race of genetically modified androids. At the movie studio, Bree is still confused on why Troy blew her off. She enters his dressing room, but Giselle and Troy start to walk in. Bree turns invisible and overhears Giselle tell Troy about Chase's schematics and that they can initiate their plan when the time is right. Bree switches the laptop that was opened with the one with Chase's schematics and Giselle and Troy leave. During filming of the movie, Bree stops Troy before he can fire a blaster gun at Adam, Chase, and Leo. Bree explains to everyone that Giselle only lured them to the set to kill them. Giselle then explains to them that she wanted to get her hands on advanced android fighting machines until Adam, Bree, and Chase ruined her chances. Giselle also reveals that all of her film crew members are androids, including Troy. Giselle then mentions that, with Chase's schematics, she can give all of them super intelligence. Troy gets a hold of the blaster gun, but Bree interrupts to say if he destroys them, he destroys the laptop with Chase's schematics, though Giselle has already made backups all over her servers. Chase then hatches a plan to use a virus to destroy the servers. A battle ensues with Adam, Bree, and Leo trying to take down the androids, while Chase and Douglas manage to let the virus out and fry Giselle's servers. The androids then surround the Lab Rats and Troy sneaks up, knocks Chase unconscious, and carries him away. Giselle then hatches a plan to rip out Chase's chip. Giselle later tells them that the set is rigged with explosives. The android film crew starts geo-leaping away from the movie studio. Adam, Bree, Leo, and Douglas manage to escape by grabbing onto the androids. Douglas is unable to locate Chase because Giselle deactivated his Location App. In the lab, Giselle tells Chase that Troy is an old model and she created a newer version with androids taking the appearance of anyone of Giselle's choosing so that they can blend in with society. Douglas calls Giselle so Leo can track her location. The academy is attacked by a new android warrior. Adam and Bree escape to rescue Chase. At the lab, Adam and Bree arrive and Troy wants to be the one to destroy them while an android warrior tries to rip out Chase's chip. At the academy, Douglas reveals that the androids' off switches are located inside of their noses. At the lab, Adam and Bree battle against Giselle and Troy. At the academy, Leo deactivates the android warrior. At the lab, Adam and Bree use their bionic abilities to knock out Giselle and Troy. Adam and Bree race to Chase's side, but are too late. Adam feels guilty because all he has ever done to Chase is punch and make fun of him, but never told him that he loved him. Giselle enters and mockingly apologizes. Chase reveals to everyone that he is alive. Only Chase's android replica is on the table. Giselle unleashes more android warriors, but they are quickly destroyed by Leo and Douglas. Troy awakens and double-crosses Giselle because she was planning to get rid of him. With her out of the way, he plans on not only destroying bionic humans but also all humans. He blasts Giselle, knocking her out, and then takes Bree hostage. Bree demands for Adam to use his blast wave to take Troy out, but he refuses, saying it would take her out as well. Bree tells him that if it means saving everyone else then it is worth it. After some hesitation, Adam, Chase, and Leo get ready to attack just as Troy backs away to a sink full of water. Bree then realizes that water would destroy him and manages to break free from him and dunk him into the sink, which short-circuits him. However, Giselle manages to escape. In the end, Giselle is looking for Marcus in Douglas' old lair.

Special guest star: Leo Howard as Troy West

Guest stars: Jeremy Kent Jackson as Douglas, Jessalyn Wanlim as Giselle

Adam, Bree, and Chase are looking for Leo because he is late for training and find out he is in Mission Creek because Janelle threatened to break up with him. S-1 shows up unexpectedly and shocks everyone. She came to the island because, like everyone else, her memory is blank, but has continuing flashbacks of Krane. No one believes her until she suggests taking out her chip. Chase and Douglas realize that she has a doomsday virus in her because she was under the influence of the Triton App. Feeling it is worse than he thought, Chase uses his scan ability and finds out that the students, Adam, Bree, and himself also have the doomsday virus implanted in them. Bree accidentally blurts out that they are all going to die and everyone starts to panic. Chase and Douglas try to find a way to save everyone before they die. Leo comes out of the hydro-loop and attacks S-1, unaware that she does not have any memories of their encounter, knocking her unconscious. Elsewhere, Adam and Bree are disappointed when they find out time is running out on them and they decide to have one last hurrah before they die. Adam wants to break the world record for blowing the most balloons with his pressurized lung capacity ability, while Bree wants to have a party with all of her friends from Mission Creek. S-1 wakes up, and Leo knocks her out again out of fear. Adam does a webcast, in which he shows everyone he's breaking the record for blowing the most balloons, but Bree walks in and is upset because instead of saying, "You're all dear to me, so I'm having a party," on an invite, she mistakenly writes, "You're all dead to me, so I'm having a party." S-1 comes to again and relives the memory of Krane giving her the encryption code to try to destroy the virus, with Douglas playing Krane and Chase playing S-1, to no avail. When Adam finds out how upset Bree was because she could not get her friends to come, Adam invites random strangers from the pier. Bree still wants her friends to come, but she is glad to know she has a brother who cares. Douglas and Chase are unable to find a way to stop the virus until Chase plans to have everyone temporarily die so he can give themselves doomsday viruses. Chase does not have time for Douglas' backup plan, so he relies on Leo to finish the job. Chase starts to explain what Leo should do, until everyone dies. Douglas returns to synchronize his laptop's firewall to the virus, but he instead follows Chase's plan and saves everyone. Everyone is virus-free, and Leo and S-1 decide to let bygones be bygones.

Guest stars: Jeremy Kent Jackson as Douglas, Ashley Argota as S-1

Douglas creates a device that makes any bionic human as smart as Chase. After Douglas tests it on Bob, Bob starts spending time with Chase. This leaves Adam in envy. Meanwhile, Perry made the island officially her own, which makes Bree and Leo angry at her.

Guest stars: Maile Flanagan as Perry, Jeremy Kent Jackson as Douglas, Brandon Salgado-Telis as Bob

Donald gives Eddy a human body and replaces his disrespectful personality to make him nicer. Perry restores his old personality, and he attempts to harm the students.

Special guest star: Will Forte as Eddy

Leo just finishes his movie marathon while everyone else is frustrated because they have nothing to do on Halloween. Bob intentionally stays behind while the other students are away with Davenport to a museum. Perry says she's going to another island across from theirs, but Douglas says no because it's deserted and has been uninhabited for years. When Douglas leaves, the group decides to go anyway. While on the deserted island they come across a metal skull. Perry wants to bring with her to the academy, but Chase and Bree refuse to have it there and tells Perry to put it back. When everyone leaves, Perry sneaks the skull back to the academy. Meanwhile at the academy Adam teaches Bob about the art of Halloween but fails when Bob tells the others that Adam is trying to scare them with a skeleton. Perry paints the skull black and tries to sell it online. Leo, Bree, and Chase see this and Leo is immediately afraid saying everyone is cursed. Chase decides to take the skull back to the island despite Leo's paranoia. Bob tries to understand Halloween by showing Adam his most terrifying items such as a math test, a potato with eyes, and Santa Claus, but Adam is unimpressed. Perry runs into Bree and Leo saying that something is wrong. While trying to figure out what, a ceiling fan crashes down nearly killing them. Bree tries calm everyone down until a knives shoot across the room directly at Leo until he blocks it and a fireball hits Perry in the back of head, barely grazing her hair. Everyone is convinced that the skull is cursed and tells Bob and Adam, until Bob tells that everything was caused by Chase (with his skin turning pale and his eyes red). Bree decides to take it back to the island herself. Douglas arrives and tells him that skull is just a paperweight and virus was spilled on it and turns anyone evil for those who came into contact with it. Perry was uninfected when she touched it earlier because of the gloves she was wearing. Douglas decides to destroy it but can't because Bree left with it, and everyone sets out to find her, until she enters in the same condition as Chase. Bob is tied up when everyone returns, and Douglas uses Davenport's nanobots in the shape of an injector to cure Chase and Bree. Bree and Chase attempt to destroy everyone until Adam pretends to be infected to get close enough to cure Bree and Chase. With everyone cured, Douglas finally attempts to rebury the skull until Bob and Adam touch the skull.

Guest stars: Maile Flanagan as Perry, Jeremy Kent Jackson as Douglas, Brandon Salgado-Telis as Bob

Donald tells the group that the president has decided to host an award ceremony because they have completed their one-thousandth mission and Leo wants his recognition, but it's only for the original members. Disappointed, Leo forms his own team with S-1, who calls herself Taylor now, and Logan. He shows the other Lab Rats that he and Taylor can fuse their abilities and can take out any power source, Chase demands they stop, but Leo pushes on. The blast becomes too much for Taylor and it incapacitates her. Leo feels completely guilty for what he's done and decides to quit the academy and go back to Mission Creek to live with his mom. Meanwhile, Donald builds a limo to be indestructible, but Douglas easily destroys it. Taylor regains consciousness and will be okay, but because of the blast it renders her permanently blind. Douglas invents a gadget that allows Taylor to echo-locate to detect obstacles in her way. Elsewhere, Adam and Douglas successfully make Davenport's limo completely indestructible. The family is on their way to the ceremony when the bridge begins to collapse, nearly sending the limo over the edge. The group becomes trapped as the limo locks down due to how it was built for emergencies. The students at the academy see them on the news and attempt to save them and the rest of the civilians still on the bridge. Taylor and Logan call Leo and ask him to help. They rush to the scene and manage to save everyone, but the limo is still sliding off the edge. Taylor, Leo, and Logan attempt to hit the fin of the limo so the lock down can be lifted and the others can escape. Bree opens the sunroof and uses her super speed to get the others out. She manages to get everyone except Chase, so Leo forces everyone off the bridge to so he can help him. Eventually, Leo manages to save Chase. Later at the academy, Donald decides to make Leo a mentor because he had proven to be a leader.

Tasha arrives on the Bionic Island informing everyone that she has tickets to a big football game of the Pioneers (mascot of a college that she went to) vs Vikings (mascot of a college that Perry went to) and Perry arrives stating that she has been trying to score tickets for weeks but it was sold out. When she asks Tasha if she has any tickets, Tasha lies saying that she hasn't. When they are about to enter the game, Perry eventually finds out the truth, she becomes furious and destroys the tickets which causes Leo, Donald, and Tasha to try to get new tickets competing against her in The Ultimate Tailgate Challenge, hosted by NFL former linebacker Willie McGinest. Meanwhile, Bree attempts to achieve her college experience by fitting in with a couple of college students (who are football fans) and attempting to use her bionics to impress them. But when Chase tells her not because it is too rational and embarrassing, he does it himself anyway, which causes her to become angry and jealous. Adam and Bob on the other hand stay on the island and create a web show about breaking stuff, but they accidentally destroy the capsules while playing disk with a coffee table, they eventually fix it but are busted.

Everyone is shocked when Douglas introduces a fourth bionic sibling named Daniel who’s been living a normal life with an adopted family. Daniel later comes to the academy to meet his father, uncle, and cousins. After Daniel's bionics are accidentally activated by the Lab Rats, Donald and Douglas find out what happened they have to come clean to Daniel about his power-replicating abilities. Daniel also finds out that his cousins are actually his biologic siblings. Filled with anger, Daniel goes out for air on the beach, where Leo and him have a conversation about Douglas. Not too long after, Daniel, using Leo's abilities, accidentally causes a leak in the hydro-loop's fuel tank. After Adam and Daniel combined their powers to stop it, Douglas apologizes to Daniel for lying and Daniel decides to give Douglas a second chance.

In the middle of a massive heat wave, the whole family is going to space to see Donald's space colony, called "Davenportia". Adam annoys Chase while Chase tries to give his safety instructions and accidentally blasts them into space. After leaving the solar system, they initiate hyper-speed and land on the planet Lithios. In the dome, it's discovered that Perry sneaked her way in with the rest of the colonists. In the command center, one of the satellites loses contact with Earth and the Lab Rats try to fix it. Leo and Donald find a punctured hole in the dome, releasing the oxygen within. Chase checks out the satellite, but can't seem to find anything wrong with it. He detects that it's someone tampering with the system back on Davenportia. As Chase heads back to the ship, his jet pack malfunctions and drifts him off into space. Unable to reach him due to range, Perry plans to fly the ship to find Chase. Leo and Donald use their jet packs to seal the hole in the dome. On a deserted planet, they find Chase unharmed because of his force field. On the ship, Chase vows not to speak to Adam because of his reckless actions. Donald is nearly pulled out into space, but Leo pulls him back and patches the hole. When the Lab Rats and Perry come back, they find everyone missing. A person in a suit comes out and reveals himself as Krane and says everything was caused by him. He has come back to create a new army of bionic warriors with his new partner, Dr. Gao. He attacks Chase and implants the Triton App in Donald. Gao gives himself bionics and plans to give everyone liquid bionics. Leo gets his fire blaster to shoot the bins of liquid bionics and Bree takes off Krane's oxygen tube. Gao escapes and Leo shoots the hole in the dome as everyone is escaping. On planning a way back to Earth, Gao enters the ship and implants Leo with the Triton App while covering his mouth to prevent him from calling for help. Leo attacks the group and is subdued by Adam and Bree. Gao explains that he will wipe out all human existence on Earth with a doomsday missile. Leo attacks again, but Bree tries to distract him by turning invisible. Leo then hits Gao, knocking him out, and Perry locks them up. Krane manages to survive and begins to attack the ship from one of the colonists' space pods. Krane takes out their defense mechanism and their homing device. Chase manages to lock on to Krane with the missile and destroys him. However, the other missile is still heading toward Earth and Chase decides to use Donald's high velocity escape suit, but Bree tells him he'll die because of the force it has. Adam decides to do it instead because his strength will help his chances of surviving. Chase thinks it too risky, but Adam is willing to take the risk in order to save the world. After a while he becomes unresponsive due to blacking out. When he comes to, Adam destroys the rocket.

Donald and Douglas reveal that they have built an upgrade for all the students' bionics, except for Leo's. But the upgrade doesn't work on Adam, Bree, and Chase because their systems are older. Adam, Bree, and Chase are therefore left at their level, while all the students are much more powerful. Meanwhile, Daniel is brought to the Academy because he had been using his bionics in the outside world. Douglas decides to enroll Daniel at the Academy, and he makes Leo his mentor. Leo steadily tries to teach Daniel, but Daniel proves to be unteachable, so Leo gives him the upgrade as well. The students steadily start to vanish, including Daniel. Giselle Vickers, Douglas' old girlfriend, is revealed to have captured them. Daniel sends a video message to the Island, requesting help. Donald, Douglas, Adam, Bree, Chase, and Leo suit up and go to Giselle's lab. There, Daniel draws them into a room that immediately locks itself. Giselle comes out, and shows them that the students are trapped in another room, including Daniel. Then the Daniel that drew them into the room reveals himself to be Marcus.

Giselle reveals she dug up Marcus from Douglas' old lair and rebuilt him, piece-by-piece. Marcus wants revenge on Douglas for leaving him to die. Everyone rushes Giselle and Marcus, but Marcus knocks everyone unconscious. Donald and Douglas are tied together in chairs, while Adam, Bree, Chase, and Leo are put in the chamber with the students, while Daniel is pulled out. Giselle burns out the Lab Rats and the students chips but doesn't tell them. Leo is the only one who can use his bionics, so he frees everyone from the chamber. Giselle leaves to stop them, but the Lab Rats let the students escape and they fight Giselle alone. Giselle attempts to use her whip to destroy Adam, Bree, and Chase, but her attack misses, causing the whip to tie around herself, cutting her in pieces. Meanwhile, Marcus tortures Daniel in front of Donald and Douglas, and after failed attempts to turn Marcus to their side, Douglas reveals that Daniel can replicate Marcus' bionics. Daniel uses this ability to blow Marcus up. After everyone regroups, Donald tells the Lab Rats that in order to repair their bionics, they would have to go back to the old lab in Mission Creek. Once there, Donald and Douglas reveal that they created one universal bionic super chip, so they would all get the upgrade. Douglas also reveals that he brought Marcus' parts from Giselle's lab, and he expresses his desire to rebuild Marcus and reprogram him to be good. Everyone else disagrees. Tasha comes down and reveals that she is pregnant with a girl. Perry comes and reveals her relief that everyone's okay. Everyone but Leo goes upstairs to eat, and Leo throws Marcus' parts on the ground. As Leo is walking away, Marcus' regenerates. Leo and Marcus stand off, and before either of them can attack, Douglas blasts Marcus, melting him. Later, as the Lab Rats are packing to go back to the Academy, Donald walks in and tells them that he's splitting them up. It is decided that Adam and Leo would go back to the Academy, while Bree and Chase would stay with Donald to work on a mysterious new project, with a mysterious new team. When Adam and Leo leave, Donald asks Bree and Chase, "Are you ready to start your new adventure?"