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Dennis O'Keefe as William T. Marshall |
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Ann Sears as Katie Whiteside |
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Anton Diffring as Karmak |
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Patrick Barr as Inspector Madden |
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Vernon Greeves as Larry Shaw |
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Eileen Elton as Melissa Collins |
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Frederick Schiller as Schleigel |
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Jacqueline Curtis as Penny |
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G.H. Mulcaster as Bennett |
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Gerald Case as Hawley |
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Jack McNaughton as Coroner |
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Colin Croft as Bartender |
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Andy Ho as Houseman |
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Humphrey Morton as Corbey |
| Directing | Burt Balaban | Director |
| Writing | Irve Tunick | Writer |
| Editing | Eric Boyd-Perkins | Editor |
| Production | Laurie Lawrence | Unit Manager |
| Art | Harry White | Art Direction |
| Camera | Ian D. Struthers | Director of Photography |
| Production | William N. Boyle | Production Supervisor |
| Sound | Sydney Wiles | Sound |
| Camera | Terry Maher | Camera Operator |
| Costume & Make-Up | Jim Hydes | Makeup Artist |
| Directing | Barbara Wainwright | Continuity |
| Directing | Percy Hermes | Assistant Director |
| Production | Bernard Donnenfeld | Producer |
| Sound | Phil Cardew | Original Music Composer |
| Costume & Make-Up | Irma Birch | Wardrobe Master |
| Production | Burt Balaban | Producer |
