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Hayley Mills as Susan Harper |
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Hywel Bennett as Martin (Georgie) Durnley |
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Billie Whitelaw as Joan Harper |
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Frank Finlay as Henry Durnley |
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Barry Foster as Gerry Henderson |
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Phyllis Calvert as Enid Durnley |
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Salmaan Peerzada as Shashie Kadir |
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Christian Roberts as Philip Harvey |
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Gretchen Franklin as Clarkie |
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Timothy West as Superintendant Dakin |
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Thorley Walters as Sir John Forrester |
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Russell Napier as Professor Fuller |
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Timothy Bateson as Mr. Groom |
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Basil Dignam as Doctor |
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Marianne Stone as Store Detective |
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Richard Davies as 'Taffy' Evans |
| Writing | Roger Marshall | Story |
| Sound | Bernard Herrmann | Original Music Composer |
| Writing | Leo Marks | Screenplay |
| Writing | Roy Boulting | Screenplay |
| Directing | Roy Boulting | Director |
| Writing | Roger Marshall | Idea |
| Production | Frank Granat | Producer |
| Camera | Harry Waxman | Director of Photography |
| Production | John Boulting | Executive Producer |
| Editing | Martin Charles | Editor |
| Production | Thelma Graves | Casting |
| Art | Albert Witherick | Art Direction |
| Production | George W. George | Producer |
| Camera | Gerry Anstiss | Camera Operator |
| Costume & Make-Up | George Partleton | Makeup Artist |
| Sound | Stanley Smith | Sound Editor |
| Costume & Make-Up | Joan Carpenter | Hairstylist |
| Writing | Jeremy Scott | Idea |
