Marilyn Hanold
Princess Marcuzan
James Karen
Dr. Steele
Lou Cutell
Dr. Nadir
Nancy Marshall
Karen Grant
David Kerman
General Bowens
Robert Reilly
Col. Frank Saunders / Frankenstein
Robert Alan Browne
Martian Crewmember (uncredited)
Robert Fields
Reporter (uncredited)
Bruce Glover
Martian Crewmember / The Monster (uncredited)