3rd Rock from the Sun (season 3)

Dick comes up with a plan to get his new wife to leave him - by turning himself into the worst possible husband anyone could have. This doesn't work, and despite all his attempts to keep his wife secret, Mary soon finds out and breaks up with him, furious.

When Dick discovers that he has put on a large amount of weight, Nina tells him that it is because he is sad about his breakup with Mary. Dick tries to slim by eating healthily and attending exercise classes, but nothing works and he ends up joining a weight loss group, where he runs into Mary. At home, Sally begins to grow attached to her new tomato plant and names it Jeremy, leading Don to fear the worst when he hears that Sally is spending lots of time with 'him'. Meanwhile, Tommy is worried that August is cheating on him, and sends Harry to investigate.

Guest Star: Ray Liotta

Dick gets jury duty for the first time and struggles to deliver a guilty verdict for a clearly guilty man. Meanwhile, Sally, much to Officer Don's distress, falls for a cockney 'artist' called Seth, and makes herself over to look and sound just like him. Elsewhere, Harry and Tommy volunteer themselves for Mary's class project - they must communicate without words for five days.

Dick has two theater tickets for Peter Connolly's 'King of the Jig' left over from when he and Mary were dating, but upon realizing that he doesn't have any friends to accompany him, he forges a friendship with Don and becomes jealous when Don wants to spend time with his other friends. Meanwhile, Sally's 'artist' boyfriend Seth voices his dislike of Connolly and Sally decides to lure him to Johnny Foam's, while Tommy forces Harry to go to night school and earn a diploma, so that he can have the things his friends do.

Clip show in which the Solomons review how some of their past experiences on Earth have involved the Seven Deadly Sins.

Tommy decides that he needs to find a woman who is closer to his real age, and pursues Mary, kicking up a fierce rivalry between himself and Dick. Elsewhere, Sally finally gets a proper job, but her boss begins to sexually harass her, while Harry is under orders not to watch any TV for a week, since Dick thinks he is watching too much of it.

Tommy is tired of being treated like a kid and decides to retire so that he can act the age he truly is (being the oldest of the group in alien form). At work, Mary reveals to Dick that she'd always dreamed of being a lounge singer, so he decides to try to help her realize this. Meanwhile, Don unwittingly ends up stealing one of Sally's panties, and makes a series of attempts to return it without being caught.

Dick decides to try to win back Mary's heart with a romantic champagne evening, and thinks it a lucky opportunity when the pair of them end up locked in the university library all weekend. Sally, Harry and Tommy, meanwhile, are determined to stop the pair getting back together and head to Mary's house to intervene, where they get distracted and end up running up her Pay-Per-View bill and hosting a Tupperware party that she'd planned.

Mary's father arrives in town, announcing that he and his wife are separated, but unfortunately for Mary, he soon begins dating Sally. Meanwhile, Harry and Tommy stumble upon Pendleton's university radio station, where Harry takes the controls and begins a new-found career as a shock jock.

After Mary and August tell the Solomons that they can be a little weird sometimes, they strive to become a completely average family, going as far as to move to a new, average, apartment, make themselves over with new, average clothes and behave in the most average way they can. Unfortunately for Dick, Mary is soon turned off, missing his old weirdness.

An eccentric new professor (John Cleese) has arrived at Pendleton University and Dick is quick to befriend him; he soon becomes annoyed when Dr. Neesam appears to be able to do everything better than he can, and becomes a rival for Mary's affections. Sally becomes concerned that Officer Don has lost interest in her after hearing a woman tell him he was "great last night", so Mrs. Dubcek convinces her to disguise herself and follow him around.

Dick becomes concerned that the Solomons are spending little time together and orders the family on a camping holiday, forbidding them to bring anyone else. Unfortunately, and much to the other Solomons' annoyance, he invites Mary to join them and, as a result, everybody becomes angry with him. Outcast, he ventures into the woods and ends up becoming leader of a group of young Beaver Scouts, while the other Solomons and Mary attempt to find him. Guest appearances by Miles Marsico, Meredith Baxter and Robert Gentry

Harry drives Nina to the dentist and behaves so sweetly toward her that he ends up stirring her emotions and sparking a romance. At work, Mary has been awarded a place in a promotional video for Pendleton and a jealous Dick takes desperate measures to ensure that he also is granted a place in it. Unfortunately, neither Dick or Mary share the director's vision and end up ruining the video. Meanwhile, Officer Don gives Sally a key to his apartment, hoping that the pair can spend more quality time together; however, he regrets it when she begins to treat the place a little too much as if it is her own. Guest appearances by George Michael, Jerry Seinfeld, Ralph Macchio, Kirstie Alley, John Stamos and William Petersen

Dick prepares to celebrate his second anniversary of his first real date with Mary, and Vicki Dubcek returns to rekindle her romance with Harry. Sally, however, wants to lose her virginity to Don, but has trouble when Dick, angry that Mary didn't know what the celebration was about, locks himself in his bedroom, as her bedroom is on the other side of his. There are more sinister things afoot, however, when Randy (Phil Hartman), a disgruntled ex-lover of Vicki's turns up and kidnaps Harry.

• 8 days after this episode aired, Phil Hartman was shot and killed by his wife. For this reason, he is only mentioned in passing during the next episode.