The Shumway Family •
Gordon (Gordo) Shumway / ALF (voiced by
Paul Fusco) – The
protagonist. A resident of East Velcro and member of the Melmacian Orbit Guard. •
Bob Shumway (voiced by Thick Wilson) – Gordon's father. He works at a
mayonnaise factory and is an amateur inventor. •
Flo Shumway (voiced by Peggy Mahon) – Gordon's mother. •
Curtis Shumway (voiced by Michael Fantini) – Gordon's younger brother. •
Augie Shumway (voiced by
Paulina Gillis) – Gordon's younger sister. •
Neep – The Shumway family's pet, a dog-like alien creature called a vespa. •
Harry – The Shumway family's pet, a bird-like alien creature called a Westfellman Smulk.
Melmacians •
Rhonda (voiced by
Paulina Gillis) – Gordon's girlfriend who is secretly an accomplished pilot. •
Skipper "Skip" (voiced by Rob Cowan) – One of Gordon's friends •
Rick Fusterman (voiced by
Paul Fusco) – One of Gordon's friends. •
Spudder – Curtis' friend. •
Stella (voiced by
Ellen-Ray Hennessy) – A waitress at the Cats Up Diner. •
Eddie – The owner of the Cats Up Diner. •
Madame Pokipsi (voiced by
Deborah Theaker) – A fortune teller. •
Colonel Cantfayl (voiced by
Len Carlson) – A colonel in the Orbit Guard and Sargent Staff's superior. •
Sargent Staff (voiced by
Len Carlson) – A sergeant in the Orbit Guard and Gordon, Skip and Rick's superior officer, whom Gordon is often at odds at. •
Freda Fusterman (voiced by
Marla Lukofsky) •
Tillie (voiced by
Marla Lukofsky) •
Jane Appalling (voiced by
Marla Lukofsky) •
TV Announcer (voiced by
Marla Lukofsky)
Villains •
Larson Petty (voiced by Thick Wilson) – The main
antagonist of the series. He is an unspecified alien general who attempts to invade Melmac. •
Sloop (voiced by
Dan Hennessey) - The son/aide of Larson Petty. His birth name is Eggbert Petty. •
Louie the Pruner - A villain and owner of a salad dressing empire. •
Sonny - The son of Louie the Pruner. ==Episodes==