Harry and Sally get a cooking lesson from Mrs Dubcek, and Dick is taught about 'feelings' by his physics class, while Tommy suffers the agonies of puberty and longs to leave Earth
When Tommy catches a cold from a fellow student, the other aliens also get sick for the first time, and become convinced that they're dying
When Dick realises that, in human terms, he is considered to be past his prime, he tries to look younger by dyeing his hair black and wearing unsuitable clothes
Dick gives Tommy an assignment to explore the nature of high school. On a quest to find out about sex, Sally goes on a date with a man called Brad.
Sally complains that she never gets to make any big decisions. After he sees some of his students smoking, Dick is fascinated by the habit and soon becomes hooked on it.
Harry finds a stray puppy and gets very attached to it. When Mary Albright's old friend Jeff Willis turns up, Dick feels jealous and starts to act in a competitive way.
Sally takes on the job of researching women's grooming and beauty secrets. When Mary Albright leaves town for a while, Dick is plagued by loneliness and breaks into her home.
Dick faces the difficult task of delivering an honest eulogy at the funeral service for an irascible academic who was almost universally disliked
Mary Albright's brother Roy alarms the Solomons by telling them he has been abducted from a cornfield by an alien spacecraft, making Sally concerned that he is a security risk
When Mary Albright uses flattery to convince Dick to attend a faculty meeting in her place, he begins to learn that 'truth' can have many different degrees and nuances
Dick and Harry attend an art class where Mary Albright is studying painting, but when Harry discovers that he has real artistic talent, Dick becomes jealous
Dick convinces Mary Albright that he should accompany her to Chicago where she is to receive an anthropology award, but the journey goes badly awry
The Solomons decide to make contact with their neighbours, the Mullers, but when the new friendship turns sour, Dick experiences anger for the first time
Mary Albright becomes convinced that Dick is an activist from the 1960s who has been on the run from the FBI for decades
Sally and Harry get jobs in a pancake restaurant. Dick feels excluded when Nina and Mary Albright do some female bonding. Tommy and August have a heart-to-heart talk.
When Dick and Sally meet with Tommy's teacher Mr Randell, they learn that Tommy is having trouble fitting in with his classmates. Sally asks Harry to teach her to dance.
The Solomons explore the issues of crime and justice when their car radio is stolen and Dick is mugged at a cash machine. Tommy joins the school basketball team.
When Harry struggles to find his identity, Dick resolves to be a nurturing father figure, but his attempts to be honest with his 'new son' lead Harry to rebel
When Dick finds out that Mary Albright is getting a bigger, better office, he sabotages her good fortune. Tommy and Harry take Sally to hospital after an accident in the kitchen.
The Solomons are worried when they discover that their boss, the Big Giant Head, is sending replacements to take over their mission