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)