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Gig Young as Mike Kelton |
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Carol Lynley as Susannah Whately Kelton / Sarah |
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Oliver Reed as Ethan |
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Flora Robson as Aunt Agatha |
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Judith Arthy as Emma |
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Ann Bell as Mary Whately, Susannah's Mother |
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William Devlin as Zebulon Whately |
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Charles Lloyd Pack as Barge Master |
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Bernard Kay as Tait |
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Rick Jones as Luther Whately |
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Celia Hewitt as Aunt Sarah |
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Robert Cawdron as John Whately, Susannah's Father |
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Murray Evans as Gang Member |
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Cliff Diggins as Gang Member |
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Peter Porteous as Gang Member |
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Donald Sutherland as Zebulon (voice) |
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Ingrid Bower as Village Girl (uncredited) |
| Directing | David Greene | Director |
| Writing | H.P. Lovecraft | Book |
| Camera | Ken Hodges | Director of Photography |
| Writing | August Derleth | Book |
| Costume & Make-Up | Caroline Mott | Costume Design |
| Writing | Nat Tanchuck | Writer |
| Writing | D.B. Ledrov | Writer |
| Camera | Herbert Smith | Camera Operator |
| Production | Alexander Jacobs | Associate Producer |
| Sound | Basil Kirchin | Original Music Composer |
| Costume & Make-Up | Eileen Warwick | Hairdresser |
| Costume & Make-Up | Harry Frampton | Makeup Artist |
| Editing | Brian Smedley-Aston | Editor |
| Sound | Don Challis | Sound Editor |
| Sound | Kevin Sutton | Sound Mixer |
| Sound | Jack Harding | Original Music Composer |
| Production | Frederick Yale | Casting |
| Production | Bernard Schwartz | Executive Producer |
| Costume & Make-Up | Hylan Booker | Costume Designer |
| Production | Phillip Hazleton | Producer |
| Art | Brian Eatwell | Art Direction |
