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Patrick Wymark as Inspector Holloway |
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Margaret Johnston as Mrs. Von Sturm |
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John Standing as Mark Von Sturm |
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Alexander Knox as Frank Saville |
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Judy Huxtable as Louise Saville |
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Don Borisenko as Donald Loftis |
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Thorley Walters as Martin Roth |
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Robert Crewdson as Victor Ledoux |
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Colin Gordon as Dr. Glyn |
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Tim Barrett as Morgan |
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Frank Forsyth as Tucker |
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Olive Gregg as Mary |
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Harold Lang as Briggs |
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Gina Gianelli as Gina |
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Peter Diamond as Junk Yard Man |
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John Harvey as Reinhardt Klermer |
| Writing | Robert Bloch | Writer |
| Directing | Freddie Francis | Director |
| Production | Milton Subotsky | Producer |
| Sound | Elisabeth Lutyens | Original Music Composer |
| Production | Max Rosenberg | Producer |
| Production | Ted Wallis | Production Manager |
| Art | Scott Slimon | Set Decoration |
| Sound | Philip Martell | Conductor |
| Editing | Oswald Hafenrichter | Editor |
| Crew | Ted Samuels | Special Effects |
| Camera | John Wilcox | Director of Photography |
| Costume & Make-Up | Jill Carpenter | Makeup Artist |
| Art | William Constable | Art Direction |
| Costume & Make-Up | Henry Montsash | Hairstylist |
| Costume & Make-Up | Mary Gibson | Wardrobe Supervisor |
