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Leo McKern as Professor Kerris Bowles-Ottery |
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Janet Munro as Delia Brooks |
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Maxine Audley as Clarinda Bowles-Ottery |
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Dennis Price as Dr. John Hughes |
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Miles Malleson as Dr. Woolley |
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Mervyn Johns as Willie Pugh-Smith |
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Leonard Rossiter as Dr. Fisher |
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Jennifer White as TV Make-Up Girl |
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Patricia Jessel as Mrs. Pugh-Smith |
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Duncan Macrae as Dr. Brass |
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George Benson as Inspector Butts |
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Ralph Michael as Superintendent Rastleigh |
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Alan Wheatley as Epicene |
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Wally Patch as Tom Pike |
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Mark Dignam as The Master |
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Jerome Willis as Detective Inspector Armstrong |
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John Sharp as Hodges |
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Lloyd Pearson as Dr. Rossiter |
| Directing | Don Chaffey | Director |
| Writing | Robert Hamer | Writer |
| Writing | Donald Taylor | Screenplay |
| Production | Donald Taylor | Producer |
| Camera | Gerald Gibbs | Director of Photography |
| Editing | Peter Tanner | Editor |
| Art | George Provis | Art Direction |
| Directing | Dennis Bertera | Assistant Director |
| Directing | Barrie Melrose | Second Assistant Director |
| Sound | H.L. Bird | Sound |
| Sound | Bill Blunden | Sound Editor |
| Writing | C.E. Vulliamy | Novel |
| Sound | John Barry | Original Music Composer |
