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