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It's troubled relationship time in the season closer. The Solomons' supreme commander arrives with a troubled marriage to Vicki and a surprise for one of the gang: he's in love. Meanwhile, Harry summons up the courage to ask new police recruit Janice out on a real date; and Sally becomes convinced that Alissa is preparing to dump Tommy.

It's troubled relationship time in the season closer. The Solomons' supreme commander arrives with a troubled marriage to Vicki and a surprise for one of the gang: he's in love. Meanwhile, Harry summons up the courage to ask new police recruit Janice out on a real date; and Sally becomes convinced that Alissa is preparing to dump Tommy.

While Dick discovers the pleasures of faking "a sick day," the other Solomons find new kicks listening to cell-phone calls on Officer Don's misplaced scanner.

Frank, a former student of Mary's, returns for a lecture series and makes Dick (unaware Frank is gay) jealous. When Frank confesses he has a secret, Dick jumps to the conclusion that Frank is also an alien, "comes out" to Frank, and is soon cavorting in Rutherford's finest gay bar while thinking it is a hangout for other covert aliens. Meanwhile, the other Solomons plan a bank robbery, but fall prey to mutual suspicion.

Dick and Harry tumble down an abandoned airshaft, prompting a televised search-and-rescue headed by an eccentric Scottish expert known as "the Hole," who promptly clashes with an agitated Sally over his unorthodox rescue method. Meanwhile, down in their dark prison, an excitable Dick finally loses control while Zen-like Harry remains cool and calm. Above ground, Tommy tries to make a fast buck by hawking souvenirs of his trapped friends.

Over Mary's objections that she can't dance, Dick insists that together they can win the school Badger Day dance contest. Meanwhile, Sally and Alissa become pals -- and when they go clothes shopping together, Tommy's frustrated because Sally has a chance to see Alissa naked in the dressing room. Meanwhile, when Harry and Nina join the contest, it soon becomes clear to Dick that if he wants to win, he'll have to change partners to dance. A competitive Dick enters the Badger Day dance contest but when his tangle footed partner Mary quits in disgust, he commandeers Harry's date, the more nimble Nina, out from under his nose. Elsewhere, just when it appears that Sally will finally become friends with Alissa, she turns vindictive when Alissa accidentally walks in on Officer Don and sees him "au natural."

When a new chancellor shakes things up at Pendleton, Dick gets a striking idea and convinces his fellow faculty members to resign en masse. Meanwhile, Tommy takes a job at a pretzel stand at the mall, but finds that working for girlfriend Alissa isn't as much fun as he expected.

Dick tries to experience youth for the first time by partying with his students during spring break, but his drunken antics are wasted on Mary, who is trying to relive a favorite, and more relaxing, family outing instead. Meanwhile, Sally, Harry, and Tommy become enthralled with a no-nonsense state criminal investigator, who takes over Officer Don's command post when the police set up a stake-out in the Solomon's attic to spy on a suspected video pirate in the neighborhood.

Dick decides that since the Solomons have come to Earth during the greatest bull market in history, he should get in on the action. But when Dick and Tommy realize they've only made a measly 35 percent on their investments, greed takes over and they take matters into their own hands. Meanwhile, Sally feels "emasculated" by (and Harry falls in lust with) Rutherford's newest rookie cop Janice -- the largest, strongest, toughest woman they've ever seen.

Dick gets in trouble with Mary when he shares with her his compulsive erotic fantasies about Nina. Sally tries everyone's patience when she becomes a fanatical follower of a lifestyle guru a la Marta Stewart, and Mary asks her to cater her dinner party.

William Shatner reprises his role as the Solomons' supreme leader, the Big Giant Head, who returns to Earth to claim his son. Even though he's startled at first that the 6-month-old doesn't resemble a warrior, Stone Phillips (the Big Giant Head's earthling name) quickly becomes a proud papa. He also falls head over heels for the infant's mom, Vicki, who has abandoned her trashy look. But she despises him and has no plans to give up his heir. This causes a frightened Dick (to find himself between a Stone and a hard place when ordered to either make Vicki love the leader--or die!

When he learns that Mary is seeing a therapist, Dick's paranoid about what she might be saying about him. Meanwhile, Tommy's intimidated about having sex with Alissa when he finds that it won't be her first experience. When Mary's rebellious niece Tiffany comes on to him, he is only to happy to dispose of his virginity -- and to inform Alissa he has solved "their" problem. (Can this be the end of Alissa?)

Albright gets a grant to make a documentary about the Solomons, whom she admits she has been studying for the past four years and has concluded are "the typical American family." Taking this as the ultimate tribute to the success of their secret mission, Dick orders everyone to cooperate, but when the action begins, all sorts of dramatic revelations occur. To cover up their true secret, the aliens find themselves inventing escalating cover stories: Sally is really a lesbian, Tommy wets his bed (but only because Dick beats him), Harry is an alcoholic, and Dick -- well, Dick is a posturing, authoritarian fool. Who'd have thought it?

Dick finds out what it means to be charitable when he attends a charity auction and gets into a bidding war with Strudwick over a worthless painting. Meanwhile, Sally tries to stop snoring, and Harry and Tommy attempt to write a new statement for the Solomons' mission.

While Sally finds out about birth control and Dick learns about tipping, Tommy and Harry discover the rewards of panhandling.

The Solomons learn about racism when they mistakenly attend a white power rally, then enter a poetry contest for elementary school students.

After seeing Mary and Tina drooling over a photo of Harrison Ford, Dick looks into the possibility of undergoing plastic surgery. Meanwhile, Harry has his outlook changed after the surgeon assesses his features and pronounces them perfect.

The Solomons attend an interactive murder mystery at a mansion, but they don't have a clue that other guests are actors and that the action is scripted.

The Solomons don't realize how fond they are of their car until Dick wrecks it. Meanwhile, Harry finds out about insurance.

After he learns that Mary once had a fling with Dr. Strudwick, Dick determines that he must retaliate -- but he has to convince Mrs. Strudwick to take part in his plan.

Greatly relieved when Vicki's baby turns out to be human, the aliens are freshly alarmed to discover that she intends to sell her story to the tabloids.