Zach Galligan

(Billy Peltzer)

Phoebe Cates

(Kate Beringer)

John Glover

(Daniel Clamp)

Robert Prosky

(Grandpa Fred)

Robert Picardo

(Forster)

Christopher Lee

(Doctor Catheter)

Haviland Morris

(Marla Bloodstone)

Dick Miller

(Murray Futterman)

Jackie Joseph

(Sheila Futterman)

Gedde Watanabe

(Mr. Katsuji)

Keye Luke

(Mr. Wing)

Kathleen Freeman

(Microwave Marge)

Tony Randall

(Brain Gremlin)

Dan Stanton

(Lewis)

Don Stanton

(Martin)

Howie Mandel

(Gizmo)