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)

Roger Corman