Former major-leaguer Tony Micelli and his daughter Samantha arrive at the Connecticut household of executive Angela Bower, where Tony has taken a job as live-in housekeeper. The Bowers are an interesting family, to say the least. Angela is uptight and obsessed with her work. Her son Jonathan is shy and lacks self-esteem, and her mother, Mona, is a man-hungry vixen. Tony soon wins them over with his laid-back style, and the Bowers soon begin to loosen up. Over time, romantic tensions begin to surface between Angela and Tony, and we see the children grow up.

The Tanner family is an average American family. One day, they discover that they have a visitor. He's small, he's furry, he's arrogant, and he's an alien from the planet Melmac. Unsure what to do, they name him ALF: Alien Life Form. Alf soon decides that as much as he misses his home planet, there's a lot to be said for Earth: the Tanners are willing to concede anything as long as he doesn't announce his presence. Oh yeah, the the Tanners also have a cat, which looks rather tasty...

Two car thieving buddies (Ben and Alan) come to personal crossroads when Kelsey, a likable but neglected and fairly well abandoned twelve-year-old boy, crosses their path. Ben and Alan, having bonded for life in helping each other escape unhappy home lives, react differently to Kelsey's situation. One deeply fears the responsibility of looking after a child (having had no personal experiences worth following) while the other finds himself compelled to take him in (seeing himself in the child - an abandoned kid whom no one else wants).