Arnold Schwarzenegger

Douglas Quaid / Hauser

Rachel Ticotin

Melina

Sharon Stone

Lori Quaid

Ronny Cox

Vilos Cohaagen

Michael Ironside

Richter

Marshall Bell

George / Kuato

Mel Johnson Jr.

Benny

Michael Champion

Helm

Roy Brocksmith

Dr. Edgemar

Ray Baker

Bob McClane

Rosemary Dunsmore

Dr. Lull

David Knell

Ernie

Alexia Robinson

Tiffany

Dean Norris

Tony

Debbie Lee Carrington

Thumbelina

Lycia Naff

Mary

Robert Costanzo

Harry

Priscilla Allen

Fat Lady

Ken Strausbaugh

Immigration Officer

Marc Alaimo

Everett

Michael Gregory

Rebel Lieutenant

Mickey Jones

Burly Miner

Gloria Dorson

Woman in Phone Booth

Benny Corral

Punk Cabbie

Erik Cord

Lab Assistant

Frank Kopyc

Technician

Roger Cudney

Agent

Monica Steuer

Mutant Mother

Sasha Rionda

Mutant Child

Robert Picardo

Johnnycab (voice)

Kamala Lopez

Additional Voices (voice)

Bob Bergen

Additional Voices (voice)

Joe Unger

Additional Voices (voice)

Joel Kramer

Harry's Henchman (uncredited)

Andy Armstrong

Richter's Henchman (uncredited)

Frank Allen Forbes

Vestron Soldier (uncredited)

Allan Graf

Harry's Henchman (uncredited)

Peter Kent

Richter's Subway Agent (uncredited)

Steven Lambert

Man Standing Behind Fat Lady (uncredited)

Billy D. Lucas

Richter's Subway Agent (uncredited)