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Gordon Shumway, last known survivor from the planet Melmac, crash-lands his spaceship into the Tanner family's suburban garage. Willie dubs him "ALF", short for Alien Life Form. After convincing a military officer that they are not harboring a space creature, the Tanners decide to take ALF in as a member of the family.

ALF decides to have some fun while a nervous Mrs. Ochmonek baby-sits Brian.

When Lucky the cat disappears, everyone pins the blame on ALF.

ALF calls the president to address his concerns about nuclear weapons.

ALF takes a job selling cosmetics over the phone.

ALF befriends a lonely blind girl.

Willie helps homesick ALF arrange a trip to Melmac.

ALF has a crush on Lynn, so he makes a music video to impress her.

On his 45th birthday, Willie feels unfulfilled, so ALF suggests he go skydiving.

ALF sells parts of his spaceship to buy Lynn a Ferrari.

Willie loses his temper with ALF during a family camping trip.

ALF convinces Willie to travel to the mountains to cut down a real Christmas tree.

ALF heads for the garage when Kate's mother pays a visit.

ALF submits scripts to his favorite soap opera.

ALF plays matchmaker for Kate's mother.

ALF hits his head and is convinced he is an insurance salesman. The Tanners try reviewing past events to try and jog his memory.

The Tanners continue to try and jog ALF's memory, and deal with the police at the same time.

ALF befriends a young Mexican immigrant.

ALF goes through a 24-hour period of bizarre behavior.

Willie and ALF both talk to a psychologist.

ALF thinks he witnessed a murder at a neighbor's house.

ALF comes to Brian's aid when the boy has to play an asparagus in the school play.

ALF develops a gambling habit and winds up in trouble with his bookie.

Brian causes trouble at school when he repeats some of ALF's intergalactic knowledge.

A cockroach from outer space invades the Tanner home.