Quaid
Melina
Lori
Cohaagen
Richter
George / Kuato
Benny
Helm
Dr. Edgemar
McClane
Dr. Lull
Ernie
Tiffany
Tony
Bartender
Thumbelina
Mary
Harry (as Bobby Costanzo)
Stevens
Fat Lady
Immigration Officer
Everett
Rebel Lieutenant
Hotel Clerk (as Ken Gildin)
Burly Miner
Martian Husband
Martian Wife
Woman in Phone Booth
Miss Lonelyhearts (as Erika Carlson)
Punk Cabbie
Doctor
Lab Assistant
Technician
Scientist
Newscaster
Reporter
Commercial Announcer
Agent
Mutant Mother
Mutant Child
Tennis Pro
Johnnycab (voice)
Additional Voices (voice)
Richter's Henchman (uncredited)
Richter's Subway Agent (uncredited)
Renata (uncredited)
Subway Rider (uncredited)
Vestron Soldier (uncredited)
Harry's Henchman (uncredited)
Man Standing Behind Fat Lady (uncredited)
Henchman at Cementfactory (uncredited)