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| Cast | + Add Cast | 
| 67 cast members | 
| Name | Known for | 
|---|---|
| Arnold Schwarzenegger
 
Quaid
 | |
| Rachel Ticotin
 
Melina
 | |
| Sharon Stone
 
Lori
 | |
| Ronny Cox
 
Cohaagen
 | |
| Michael Ironside
 
Richter
 | |
| Marshall Bell
 
George / Kuato
 | |
| Mel Johnson Jr.
 
Benny
 | |
| Michael Champion
 
Helm
 | |
| Roy Brocksmith
 
Dr. Edgemar
 | |
| Ray Baker
 
McClane
 | |
| Rosemary Dunsmore
 
Dr. Lull
 | |
| David Knell
 
Ernie
 | |
| Alexia Robinson
 
Tiffany
 | |
| Dean Norris
 
Tony
 | |
| Mark Carlton
 
Bartender
 | |
| Debbie Lee Carrington
 
Thumbelina
 | |
| Lycia Naff
 
Mary
 | |
| Robert Costanzo
 
Harry (as Bobby Costanzo)
 | |
| Michael LaGuardia
 
Stevens
 | |
| Priscilla Allen
 
Fat Lady
 | |
| Ken Strausbaugh
 
Immigration Officer
 | |
| Marc Alaimo
 
Everett
 | |
| Michael Gregory
 
Rebel Lieutenant
 | |
| Kenneth Gildin
 
Hotel Clerk (as Ken Gildin)
 | |
| Mickey Jones
 
Burly Miner
 | |
| Parker Whitman
 
Martian Husband
 | |
| Ellen Gollas
 
Martian Wife
 | |
| Gloria Dorson
 
Woman in Phone Booth
 | |
| Erika Carlsson
 
Miss Lonelyhearts (as Erika Carlson)
 | |
| Benny Corral
 
Punk Cabbie
 | |
| Bob Tzudiker
 
Doctor
 | |
| Erik Cord
 
Lab Assistant
 | |
| Frank Kopyc
 
Technician
 | |
| Chuck Sloan
 
Scientist
 | |
| Dave Nicolson
 
Scientist
 | |
| Paula McClure
 
Newscaster
 | |
| Rebecca Ruth
 
Reporter
 | |
| Milt Tarver
 
Commercial Announcer
 | |
| Roger Cudney
 
Agent
 | |
| Monica Steuer
 
Mutant Mother
 | |
| Sasha Rionda
 
Mutant Child
 | |
| Linda Howell
 
Tennis Pro
 | |
| Robert Picardo
 
Johnnycab (voice)
 | |
| Kamala Lopez
 
Additional Voices
 | |
| Morgan Lofting
 
Additional Voices
 | |
| Patti Attar
 
Additional Voices
 | |
| Bob Bergen
 
Additional Voices
 | |
| Joe Unger
 
Additional Voices
 | |
| Karlyn Michelson
 
Additional Voices
 | |
| Andy Armstrong
 
Richter's Henchman (uncredited)
 | |
| Dickey Beer
 
Subway Agent (uncredited)
 | |
| May Boss
 
Restaurant Patron (uncredited)
 | |
| Simon Crane
 
Richter's Subway Agent (uncredited)
 | |
| Graeme Crowther
 
Richter's Subway Agent (uncredited)
 | |
| Vince Deadrick Jr.
 
Henchman (uncredited)
 | |
| Vince Deadrick Sr.
 
Restaurant Patron (uncredited)
 | |
| Thomas Ebert
 
Subway Rider (uncredited)
 | |
| Jeannie Epper
 
Restaurant Patron (uncredited)
 | |
| Frank Allen Forbes
 
Vestron Soldier (uncredited)
 | |
| Allan Graf
 
Harry's Henchman (uncredited)
 | |
| Peter Kent
 
Richter's Subway Agent (uncredited)
 | |
| Joel Kramer
 
Harry's Henchman (uncredited)
 | |
| Steven Lambert
 
Human Shield / Man Standing Behind Fat Lady (uncredited)
 | |
| Gene LeBell
 
Restaurant Patron (uncredited)
 | |
| Billy D. Lucas
 
Richter's Subway Agent (uncredited)
 | |
| Bennie Moore
 
Richter's Subway Agent (uncredited)
 | |
| Terry Richards
 
Henchman at Cementfactory (uncredited)
 |