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Christopher Lee as Dr. Stephen Hayward |
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Jon Finch as Lomax |
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Judy Geeson as Helen |
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Dilys Hamlett as Julia Hayward |
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Tony Beckley as Sgt. Greene |
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Jane Merrow as Mary Dawson |
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Colin Jeavons as Bob Dawson |
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David Trevena as Johnson |
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Adrian Cairns as Morgan |
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Daphne Neville as Nurse Fisher |
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Hugh Smith-Marriott as Dr. Chapman |
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Hubert Tucker as Ronalds |
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David Langford as Gray |
| Directing | Sidney Hayers | Director |
| Art | Kenneth Jones | Art Direction |
| Editing | Barry Peters | Supervising Editor |
| Editing | David Williams | Editor |
| Production | F. Sherwin Green | Production Supervisor |
| Writing | Philip Levene | Screenstory |
| Sound | Laurie Johnson | Original Music Composer |
| Art | Ken Bridgeman | Set Decoration |
| Costume & Make-Up | Christine Penwarden | Makeup Artist |
| Camera | Bob Edwards | Director of Photography |
| Sound | Mike Davey | Sound Recordist |
| Production | Peter Miller | Producer |
| Writing | Ben Roberts | Writer |
| Writing | Ivan Goff | Writer |
| Production | Michael Towers | Associate Producer |
| Editing | John W. Carr | Assistant Editor |
| Production | Patrick Dromgoole | Executive Producer |
