Teen Titans (season 1)

Cinderblock breaks into a prison but is beaten there by the Titans. However, a misstep in the "sonic boom" attack knocks the Titans out and allows for Cinderblock to escape and take a quarantined Plasmus with him. Robin and Cyborg fight about who messed up, causing Cyborg to quit. Slade unleashes Plasmus on the remaining four Titans. Cyborg later returns and assists the Titans in defeating Plasmus and Cinderblock.

Blackfire, Starfire's older sister, comes for a visit and quickly ingratiates herself among the Titans. Feeling left out, Starfire decides to leave the Titans before being attacked by drones sent from Centauri to arrest Blackfire for stealing. Discovering that her sister tried to have her take the blame, Starfire tracks down Blackfire and has her arrested by the Centauri police.

The Titans battle against Jinx, Gizmo, and Mammoth – members of the villain organization The Hive sent by Slade for their final test – and lose, with Robin going missing. The Hive members then kick the remaining Titans out of their tower and take over. Robin returns and the whole team fights to kick the Hive out of their home. Despite their defeat, Slade was pleased with the outcome.

Villain(s): Gizmo, Jinx, Mammoth, and Slade

Beast Boy tries to prank Cyborg, but Starfire is accidentally targeted. She stops talking to him as a result. Meanwhile, the Titans deal with a duo known as Thunder and Lightning, who's version of having fun is causing chaos among the city. The duo is approached by a mystic sage, who teaches them how to amplify their powers using an assortment of twigs and leaves. The sage, however, uses magic to animate the burning sticks as a monster. The Titans fight the monster off before it reaches town. Beast Boy attempts to break through to Thunder while Robin faces off against the sage, who turns out to be Slade.

While playing football in the park, Cyborg suddenly shuts down. After rebooting, he tells the other Titans that his batteries are dying and requires recharging, but doesn't get the chance, because the nefarious Mumbo is causing havoc in Jump City. While facing him down, Cyborg's emergency batteries fall of, and his inert body falls down into the underground depths of a junkyard. The Titans believe Mumbo has kidnapped him, but he has instead been found by a strange machine called Fixit, who doesn't share Cyborg's views of humanity. Instead, he believes it to be a flawed part of Cyborg's biology – one that he intends to correct, with or without Cyborg's consent.

During a battle with Dr. Light, Raven loses control of her powers, which makes the Titans worried. Later, Beast Boy and Cyborg goes to Raven's room to apologize, but knock her door down, and Beast Boy discovers a strange-looking mirror, which sucks him and Cyborg into alternate realm where they meet various Emoticlones, the different emotions and personality traits of Raven. Unbeknownst to them, they've stumbled upon a portal into Raven's mind, which causes an adverse effect on Raven. Raven enters the realm and finds Beast Boy and Cyborg, just as her anger appears in the form of her father, Trigon. Raven fuses with her other Emoticlones to take down her father. The ordeal brings Raven closer with Beast Boy and Cyborg, who stay besides her as she fought her anger.

The Titans receive a package containing puppets modeled after themselves. The Puppet King uses the puppets to trap the souls of Robin, Cyborg, and Beast Boy and takes control of their bodies. While trying to do the same to Raven and Starfire, Raven uses her powers to stop him, causing their souls to switch into each other's bodies. The girls resolve to learn how to use the other's powers while in each other's bodies. At the Puppet King's headquarters, Raven and Starfire manage to use each other's powers to stop the Puppet King and break the controller, returning all the souls to their respective bodies.

A mysterious new villain called Trident appears and starts stealing nuclear waste from ships. While on a mission to stop Trident, The Titans meet Aqualad, an aquatic hero who knows more about Trident's plot, and his sidekick Tramm, who helps rebuild the T-Ship while the Titans search for Trident. While Starfire and Raven fawn over Aqualad, Beast Boy and Aqualad quarrel over who is better. They eventually realize that Trident is more than one person and soon discover a colony of Tridents. Playing on Trident's ego, Beast Boy gets all the Tridents to quarrel with each other. The Titans then lock the remaining clones in a cave.

While Robin is away checking on leads about Slade, the rest of the Titans deal with a new villain, Red X, who takes them down with ease. Red X tries forming a partnership with Slade, but is tasked with retrieving two other computer chips. Starfire discovers that Robin has not been true about his work. After Red X gathers the final computer chips, Slade appears, revealing he knew that Robin was Red X the whole time, and grabs the chips. The Titans arrive at the scene and stop Red X while Slade escapes. Robin reveals himself and chases after Slade, who taunts Robin about their similarities and his obsession over him. The two engage in combat, which ends with Robin overpowering Slade, who is revealed to be a robot. Starfire later approaches Robin about the past events, telling him that Slade and he share one thing in common – their distrust of others.

Mysteriously ambushed and knocked out cold, the Titans wake to find themselves in the hands of Mad Mod, a British villain disgruntled by the Titans' interference in other villains' business. Separated from each other, the Titans make their way back to each other one by one while dealing with robots and optical illusions. They catch up with Mad Mod, only to be recaptured one by one. Robin manages to escape capture and find Mad Mod. As Robin fails to even touch the villain, he decides upon a different approach. He passes through all the illusions and reaches the operation center, where he apprehends an elderly Mad Mod.

Cyborg goes on a chase for his newly finished T-Car after its stolen by Cash and Sammy and entered into the race. After winning the race, Gizmo, one of the contestants in the race, takes the car and leaves Cash and Sammy in a bubble. Cyborg, with the help of a sympathetic Raven, tracks down the car, which crashes into a prison transport vehicle that is carrying Overload. Overload takes over the car and attacks Cyborg, leading Cyborg to destroy his own car, thereby preventing anyone else from stealing it. Raven later assists Cyborg in building a new car.

Villain(s): Overload, Cash, Sammy, and Gizmo

Slade threatens to stop time in the city with a Chronoton Detonator. While searching for the device, Robin, on edge about the dream he had just before the mission, attacks everything in sight, including an innocent bystander. After violently sneezing, Starfire, allergic to metallic chromium – a component of the detonator – unwittingly becomes a tracker for the device. In the sewer, Robin is separated from the team by Cinderblock. After taking Cinderblock down, Robin finds Slade's tracking device, using it to get to Slade's headquarters, he fights Slade for detonator's remote. The rest of the Titans chase after Slade's henchmen carrying the detonator in a speed boat. Upon discovering that the device is fake, the Titans are blasted by a gun, which infected them with lethal nanoscopic probes. Wanting to keep the Titans safe, Robin becomes Slade's apprentice.

Blackmailed into becoming Slade's apprentice, Robin becomes an enemy of the Titans, to their surprise. When faced with the opportunity to blast Starfire, Robin freezes, causing Slade to activate the probes. Catching on to the ruse, the Titans find Robin at Slade's headquarters. When Slade reactivates the probes, Robin touches the machine controlling the probes and becomes infected with them. Slade destroys the device and a battle ensues between him and the Titans, after which Slade is defeated. The Titans and Slade escape just as the building self-destructs. With the probe machine, Cyborg removes all the probes from the Titans.