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Richard Denning as Rick |
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Lori Nelson as Louise Madison |
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Paul Birch as Jim Madison |
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Mike Connors as Tony Lamont |
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Adele Jergens as Ruby |
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Raymond Hatton as Pete |
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Paul Dubov as Radek |
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Jonathan Haze as Contaminated Man |
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Paul Blaisdell as Mutant |
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Roger Corman as Nelson - Louise's Fiancée in Framed Photograph (uncredited) |
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Chet Huntley as Narrator (voice) (uncredited) |
| Art | Harry Reif | Set Decoration |
| Sound | Ronald Stein | Original Music Composer |
| Editing | Ronald Sinclair | Editor |
| Writing | Lou Rusoff | Screenplay |
| Writing | Lou Rusoff | Story |
| Production | Roger Corman | Producer |
| Directing | Roger Corman | Director |
| Visual Effects | Paul Blaisdell | Creature Design |
| Production | Alex Gordon | Executive Producer |
| Camera | Jockey Arthur Feindel | Director of Photography |
| Costume & Make-Up | Steven Clensos | Makeup Artist |
| Crew | Paul Blaisdell | Special Effects |
| Production | Bartlett A. Carré | Production Supervisor |
| Directing | Barbara Bohrer | Script Supervisor |
