Rick
Richard Denning
Louise Madison
Lori Nelson
Narrator (voice) (uncredited)
Chet Huntley
Jim Madison
Paul Birch
Tony Lamont
Mike Connors
Ruby
Adele Jergens
Pete
Raymond Hatton
Radek
Paul Dubov
Contaminated Man
Jonathan Haze
Mutant
Paul Blaisdell
Nelson - Louise's Fiancée in Framed Photograph (uncredited)
Roger Corman
Producer
Director
Creature Design
Special Effects
Editor
Ronald Sinclair
Screenplay
Lou Rusoff
Set Decoration
Harry Reif
Original Music Composer
Ronald Stein
Story
Executive Producer
Alex Gordon
Director of Photography
Jockey Arthur Feindel
Makeup Artist
Steven Clensos