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George Nader as Roy |
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Claudia Barrett as Alice |
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Gregory Moffett as Johnny |
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Jack Mylong-Münz as The Professor |
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Selena Royle as Mother |
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Pamela Paulson as Carla |
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George Barrows as Ro-Man the Monster / Great Guidance |
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John Brown as Ro-Man / Great Guidance (voice) |
| Camera | Jack Greenhalgh | Director of Photography |
| Editing | Merrill G. White | Editor |
| Directing | Phil Tucker | Director |
| Sound | Elmer Bernstein | Original Music Composer |
| Production | Phil Tucker | Producer |
| Writing | Wyott Ordung | Screenplay |
| Production | Al Zimbalist | Executive Producer |
| Production | Alan Winston | Associate Producer |
| Directing | Robert E. Barnes | Assistant Director |
| Production | Clarence Eurist | Production Supervisor |
| Costume & Make-Up | Stanley E. Campbell | Makeup Artist |
| Art | John Orlando | Property Master |
