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.

Mrs. Ochmonek thinks she's gone crazy when she spots ALF in the backyard.

ALF and the Tanners prepare to spend Christmas in a cabin. When the owner comes to visit them, ALF accidently jumps into his trunk and he is taken to a hospital and given away as a Christmas gift to a little girl.

The Tanners pamper ALF after he catches his first Earth cold.

ALF must avoid the Alien Task Force when a bum blows the whistle on him.

The Tanners are invited to a Thanksgiving dinner with the Ochmonek's bizarre relatives.

An extortionist threatens to turn ALF in to the immigration authorities for being an ""illegal alien"".

Willie and ALF hop on board a freight train in search of adventure.

Kate's friend, a known drinker, sees ALF in the kitchen and thinks she's hallucinating.

ALF hides out in the back seat during Lynn's date at the drive-in.

ALF's expose earns Willie a guest spot on David Horowitz's consumer advocate show.

ALF ghostwrites Jake's love letters.

ALF shields Willie when a criminal resembling him is profiled on a crime-stopper TV show, but Trevor turns him in.

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

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

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

ALF submits scripts to his favorite soap opera.

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

A cockroach from outer space invades the Tanner home.

The Tanners become a TV-ratings family and ALF decides to rig the system so that his favorite program becomes a hit.

ALF becomes the star attraction at the Tanners' Halloween party.

ALF gets a severe case of hiccups after being excluded from Dorothy and Whizzer's wedding party.

ALF takes a job as a paper carrier when he learns that the cost of his upkeep is preventing Lynn from attending her first-choice college.

Betrayed confidences cause a falling-out between ALF and Lynn.