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Christopher Lee as Dr. Ian Mandeville |
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Joan Collins as Sarah Mandeville |
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Herbert Lom as Prescot |
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Jane Birkin as Alta |
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Robert Hardy as Edward Foster / Andrew Marr |
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Jean Marsh as Victoria |
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Carleton Hobbs as Old Marr |
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Roy Evans as Baxter |
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Martin Boddey as Sgt. Riley |
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John Glyn-Jones as Bank Manager |
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John Levene as Doctor |
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Jennifer Thanisch as Jessica |
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Michael McVey as Francis |
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Barry Linehan as Asylum Gatekeeper |
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Linda Gray as Woman on Hill |
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Lysandre De La Haye as Child on Hill |
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Earl Rhodes as Child on Hill |
| Directing | Don Sharp | Director |
| Art | Geoffrey Tozer | Art Direction |
| Writing | Joseph Van Winkle | Writer |
| Writing | Don Sharp | Adaptation |
| Sound | Wilfred Josephs | Original Music Composer |
| Costume & Make-Up | Helen Lennox | Hairdresser |
| Production | James Hannah Jr. | Producer |
| Sound | Paddy Cunningham | Sound Recordist |
| Costume & Make-Up | Basil Newall | Makeup Artist |
| Editing | Teddy Darvas | Editor |
| Writing | James Hannah Jr. | Adaptation |
| Camera | Ernest Steward | Director of Photography |
| Production | Frank Bevis | Production Supervisor |
| Sound | Laurie Clarkson | Sound Recordist |
| Writing | Edward Brennan | Writer |
| Art | Pamela Cornell | Assistant Art Director |
| Sound | Doug Smith | Sound Recordist |
| Sound | Pat Foster | Sound Editor |
