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Burgess Meredith as Felix Milne |
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Dulcie Gray as Patricia Milne |
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Michael Shepley as Peter Edge |
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Christine Norden as Barbara 'Babs' Edge |
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Kieron Moore as Adam Lucian |
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Barbara White as Molly Sinclair Lucian |
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Walter Fitzgerald as Dr. Norris Pile |
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Edgar Norfolk as Sir George Freethorne |
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John Laurie as Dr. James Garsten |
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Martin Miller as Dr. Hans Tautz |
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Clive Morton as Robert Paston |
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Joss Ambler as Julian Briant |
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Jack Raine as Inspector Pierce |
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Laurence Hanray as Dr. Lefage |
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Helen Haye as Lady Maresfield |
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John Stuart as Dr. John Hayling |
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Ronald Simpson as Mr. Grandison |
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Gwynne Whitby as Miss English |
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Malcolm Dalmayne as Charlie Oakes |
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Michael Hordern as Co-Counsel at Inquest |
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Jack Howarth as Party Guest |
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Geoffrey Sumner as Parkinson |
| Camera | Wilkie Cooper | Director of Photography |
| Production | Jack Kitchin | Producer |
| Production | Anthony Kimmins | Producer |
| Writing | Nigel Balchin | Screenplay |
| Editing | Richard Best | Editor |
| Sound | Benjamin Frankel | Original Music Composer |
| Directing | Anthony Kimmins | Director |
| Writing | Nigel Balchin | Novel |
| Costume & Make-Up | Alan Haines | Costume Design |
| Camera | Freddie Francis | Camera Operator |
| Crew | Alan Allen | Sound Recordist |
| Art | Anne Head | Set Decoration |
| Visual Effects | Cliff Richardson | Special Effects Supervisor |
| Costume & Make-Up | Eileen Bates | Hairstylist |
| Costume & Make-Up | John O'Gorman | Makeup Artist |
| Art | William C. Andrews | Art Direction |
