Harry's kidnapper sells him to a carnival show, where he's billed as Hargo the Alien. Dick is punished for his failure to give in his status reports.
When Mary is promoted to dean, she moves into a much nicer office and takes Nina with her, but Dick wrongly assumes he has acquired some of her power by association
Dick notices a change in his own social status relative to Mary after her promotion to dean. Tommy and Harry decide to open a lemonade stand, but it's not very successful.
The Solomons find out about the human obsession with collecting when they get caught up in a craze for furry animal soft toys, but Dick takes his new hobby too far
Dick thinks Mary is neglecting him because her new job as dean takes up too much of her time, but he cheers up when he gets a new office-mate
Dick is madly in love with literature professor Dr Jennifer Ravelli and enchanted when she speaks to him in rhyme. Sally, Harry and Tommy rearrange the furniture.
Dick realises that his romantic unavailability is making him more attractive to Mary. Don tries to teach Sally to bowl but is alarmed by her unorthodox style.
Dick has no problem with Sally posing nude for Playpen Magazine, but when he learns that Mary did the same thing 20 years previously he can't handle it
Dick struggles to understand the significance of New Year's Eve, while Harry plans a huge bash at the bar and Tommy volunteers his services as party coordinator
Chaos ensues when the Big Giant Head switches Sally's body with Dick's. Harry and Tommy are intimidated by a couple of tough-looking guys who spend a lot of time at the bar.
Dick accepts an invitation to a Solomon family reunion in Indiana, even though they are not really family
The aliens learn about tax when they attempt to file their first tax returns. Mary discovers that Dick owes nearly $10,000, and Sally opens a hair salon to claim deductions.
The aliens and Mrs Dubcek start feuding because she won't get their plumbing fixed and they won't pay their rent. Don mistakenly thinks Sally wants him to propose to her.
Mary is concerned when Chancellor Stevens seems to be avoiding her in favour of Judith, and confiding in Dick only makes her more worried
Vicki asks Harry to be the father of her child, and Sally decides she wants to move out and get her own apartment
Dick and Mary receive chain letters, and when Mary has an accident after throwing hers away, Dick believes she's brought bad luck on herself
Dick is a laughing stock when it becomes clear that he can't use a computer. Tommy and Sally buy more and more expensive televisions in their quest for the ultimate in 'home theatre'.
Mary and Dick go to a New Age couples' retreat with Harry and Vicki. Sally and Tommy mistakenly assume a new acquaintance is a member of an organised crime family.
The flat has become a wreck since Sally moved out, so Dick, Harry and Tommy hire Cathy, Mary's cleaning woman, to tidy it up. Tommy joins the staff of the school newspaper.
Dick orders the family to throw him a surprise birthday party. He is approached by a mysterious woman who claims to be auditing his class, but could she be an alien hunter?
Dick is envious when his colleague, Professor Strudwick, becomes the centre of attention after publishing a new book on physics. Sally and Don are missing each other.
When Sally, Harry and Tommy are almost hit by a falling chandelier at a local restaurant, they believe their near-death experience has given them enlightenment
The Big Giant Head warns the aliens that their mission has received a sub-standard evaluation and he's on his way to Earth to find out what's gone wrong
Dick resents the fact that he's lost his command and has to take orders from the other aliens. Stone makes a pass at Mary.