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- Richard Denning as Rick
- Lori Nelson as Louise Maddison
- Adele Jergens as Ruby
- Mike Connors as Tony Lamont
- Paul Birch as Jim Maddison
- Raymond Hatton as Pete
- Paul Dubov as Radek
- Jonathan Haze as The Contaminated Man
- Paul Blaisdell as The Mutant
- Roger Corman as Nelson