After 'The Big Giant Head' makes Sally the new high commander, Dick has problems adjusting to his different rank. Tommy is preparing for his high school prom with Alissa, but when the Big Giant Head insists on coming, things start to slide.

When the Big Giant Head visits Earth to inspect the alien mission, he embraces human vices, causing chaos for the Solomons.

When Sally, Tommy and Harry have a near death experience at a restaurant, Dick feels left out and starts searching for the experience. Sally and Harry volunteer themselves at a homeless shelter. Meanwhile, Tommy decides to waste no more time in his life - and asks Alissa to marry him.

Dick becomes jealous of professor Strudwick; Sally and Don go to the movies 'as friends' and things escalate; Mary babysits needy Nobel scientists.

Dick meets a strange woman who says he is at the top of her list and claims to have several different occupations, only to get a unexpected and unwanted surprise.

Dick hires a maid away from Mary, then Sally feels like she has been replaced. Tommy becomes a crusading editor for the school newspaper and alienates his ex-girlfriend.

Sally meets Italian-American Sammy Marchetti, who's also known as 'the Butcher'. Mary & Dick and Harry & Vicki go to a couples' retreat.

Dick catches the computer bug; Sally and Tommy become obsessed with a better television experience as technology takes over with the Solomons.

Dick and Mary both receive a chain letter. Mary throws hers away and a lot of bad luck befalls her. Don treats Tommy and Alissa to a series of ice hockey games for which he bought tickets for when he was dating Sally, but Tommy begins to worry that he isn't manly enough to compete with the likes of the players. Sally and Harry visit a hardware store, where Sally takes a liking to a series of workers, while Harry is mistaken for an employee, due to his bright orange shirt.

Sally wants to get a place of her own and move out; Vicki wants Harry to father a child with her. Meanwhile, Tommy sees babysitting with Alissa as an opportunity to prove to a dubious Harry that she really is his girlfriend.

Dr. Albright becomes concerned that Judith is after her job; Sally falls for a Neil Diamond impersonator; Vicki, Sally, Harry and Tommy hit a riverboat.

Dick and the family fight with Mrs. Dubcek over their apartment's plumbing problems; Don proposes to Sally then Sally seeks advice from Mary and Nina.

After living on Earth for three years, the Solomons finally find out they have to file and pay taxes and Dick causes the family to get audited by the IRS. Sally attempts to help by setting up a failed home hairdressing business, but when women start arriving for haircuts, Harry and Tommy 'camp up' and take to the 'salon' to help.

Dick receives an invitation for a family reunion that was meant for someone else but the Solomons go anyway.

The Big Giant Head finally grants a request that Sally made when she first arrived on Earth and forces her to swap bodies with Dick.; Harry takes over Happy Doug's bar while Doug is on vacation.

Dick gets down in the dumps as the New Year approaches; Sally manipulates Officer Don once again.

Sally wants to pose in the nude but it is Harry who ends up that way instead; Tommy tries to impress his new female lab partner.

Dick finds Jennifer extremely irritating and tries to get back together with Mary; Sally discovers bowling and drives Officer Don up a wall with her unique bowling style.

Dick becomes obsessed with Jennifer after Dean Albright can't find time for him anymore. Harry, Tommy and Sally become obsessed with rearranging furniture and giving rooms uses they were not meant for.

Dean Albright puts another professor in the office with Dick and problems arise; Sally tries to play match maker with Nina. At Happy Doug's bar, Tommy fixes up an old 'love tester' machine but is disappointed when it classifies him as 'cold fish' and Harry 'hot stuff'.

Dick becomes obsessed with collecting a series of stuffed animals; Tommy's principal has a talk with him about school spirit and Tommy then goes overboard.

When Sally discovers that Officer Don has had other girlfriends before her, she starts to track them down. Dick has problems adjusting to being the dean's boyfriend.

After Mary is made the new Dean of the School of Arts and Sciences, Dick uses her position to his advantage and ends up firing his arch nemesis, cafeteria worker Lucy, who then files a grievance. Sally prepares to lose her virginity to Don, but afterwards finds that she cannot talk to anyone about it, much to the other Solomons' annoyance.

Harry has been kidnapped and the Solomons try to find him, a task that is complicated by the fact that Dick is literally losing his mind.