Zach Galligan
as Billy Peltzer

Phoebe Cates
as Kate Beringer

John Glover
as Daniel Clamp

Robert Prosky
as Grandpa Fred

Robert Picardo
as Forster

Christopher Lee
as Doctor Catheter

Haviland Morris
as Marla Bloodstone

Dick Miller
as Murray Futterman

Jackie Joseph
as Sheila Futterman

Gedde Watanabe
as Mr. Katsuji

Keye Luke
as Mr. Wing

Kathleen Freeman
as Microwave Marge

Don Stanton
as Martin

Dan Stanton
as Lewis

Shawn Nelson
as Wally

John Astin
as Janitor

Henry Gibson
as Employee Fired for Smoking

Rick Ducommun
as Clamp Center Security Guard

Julia Sweeney
as Peggy

Raymond Cruz
as Messenger

John Capodice
as Fire Chief

Isiah Whitlock Jr.
as Fireman

Dean Norris
as SWAT Team Leader

Saachiko
as Newsstand Lady

May Quigley
as Hallway Employee

Tony Winters
as Hallway Employee

Jacque Lynn Colton
as Lady at Elevator

Stéphanie Menuez
as Clamp's Secretary

Gray Daniels
as TV Cameraman

Dale Swann
as Clamp Center Surveillance Supervisor

Charles S. Haas
as Casper

Jeff Swanson
as Forster's Assistant

Page Hannah
as Tour Guide #1

Liz Pryor
as Tour Guide #2

Vladimir Bibic
as Taxi Driver

Sarah Lilly
as Reporter in Lobby

Frank P. Ryan
as Cop

Paul Bartel
as Theatre Manager

Belinda Balaski
as Movie Theater Mom

Nicky Rose
as Movie Theatre Kid

Kenneth Tobey
as Projectionist

Leonard Maltin
as Leonard Maltin

Hulk Hogan
as Hulk Hogan

Dick Butkus
as Dick Butkus

Bubba Smith
as Bubba Smith

Heidi Kempf
as TV Reporter

Eric Shawn
as TV Reporter

Michael Salort
as TV Reporter

Diane Sainte-Marie
as TV Reporter at Wing's

Kristi Witker
as TV Anchor in Bar

Archie Hahn
as Forster's Technician

Leslie Neale
as Forster's Technician

Ron Fassler
as Forster's Technician

Time Winters
as Forster's Technician

Heather Haase
as Yogurt Jerk

Jason Presson
as Yogurt Jerk

Lisa Mende
as Yogurt Customer

Patrika Darbo
as Yogurt Customer

Jerry Goldsmith
as Yogurt Customer

Howie Mandel
as Gizmo (voice)

Frank Welker
as Mohawk (voice)

Tony Randall
as Brain Gremlin (voice)

Mark Dodson
as Gremlins (voice)

Kirk R. Thatcher
as Gremlins (voice)

Neil Ross
as Announcer (voice)

Jeff Bergman
as Bugs Bunny / Daffy Duck / Porky Pig (voice)

Joe Dante
as Grandpa Fred Director (uncredited)