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Tony Britton as Dr. Robert Marriott |
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Virginia Maskell as Dr. Lucy Byrne |
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Ian Bannen as Alan Andrews |
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Kenneth Griffith as Dr Shole |
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Peter Cushing as Professor Sewell |
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Thorley Walters as Special Agent Prince |
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Donald Pleasence as Parsons, alias Bill Brown |
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Spike Milligan as Arthur, lab orderly |
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Raymond Huntley as Sir George Gatting the Minister of Defense |
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Sam Kydd as Slater |
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Anthony Booth as Parkin |
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Basil Dignam as Dr Childs |
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Brian Oulton as Director |
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Robert Bruce as Levers |
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John Payne as Iverson |
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Bruce Wightman as Phil the Barman |
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Geoffrey Bayldon as Rosson |
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Andre Charisse as Heller |
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Ian Wilson as Pin Table Man |
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Margaret Lacey as Prince's Secretary |
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Murray Melvin as Teddy Boy |
| Directing | Roy Boulting | Director |
| Writing | Roy Boulting | Writer |
| Writing | Nigel Balchin | Novel |
| Writing | Nigel Balchin | Screenplay |
| Editing | John Jympson | Editor |
| Art | Albert Witherick | Art Direction |
| Art | Peter James | Set Decoration |
| Directing | John Boulting | Director |
| Camera | Mutz Greenbaum | Director of Photography |
| Camera | Laurie Ridley | Still Photographer |
| Production | John Boulting | Producer |
| Production | Roy Boulting | Producer |
| Costume & Make-Up | Anne Box | Hairstylist |
| Costume & Make-Up | Freddie Williamson | Makeup Artist |
| Production | Philip Shipway | Production Manager |
| Directing | Basil Rayburn | Assistant Director |
| Crew | Alan Evans | Scenic Artist |
| Sound | George Stephenson | Sound Mixer |
| Camera | Peter Allwork | Camera Operator |
| Camera | Gerry Anstiss | Assistant Camera |
