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Richard Todd as Dr. Bob McLaurin |
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Betsy Drake as Dr. Nancy Ferguson |
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Herbert Lom as Juan Menda |
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Warren Stevens as Finch |
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Carlo Giustini as Francisco Flores (as Carlo Justini) |
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Paul Carpenter as O'Brien |
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Alexander Knox as Dr. McNeil |
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Lisa Gastoni as Carla Menda |
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Peter Arne as Kral |
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John Crawford as Boyd |
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Catherine Boyle as Catherine McLaurin |
| Directing | Jack Cardiff | Director |
| Production | Adrian D. Worker | Producer |
| Writing | Jimmy Sangster | Screenplay |
| Sound | A.W. Lumkin | Recording Supervision |
| Sound | Len Shilton | Sound |
| Sound | City of London Sinfonia | Musician |
| Costume & Make-Up | Brian Owen-Smith | Wardrobe Supervisor |
| Directing | Frederick Goode | Assistant Director |
| Writing | Michael Bryan | Novel |
| Directing | Pamela Davies | Continuity |
| Production | Douglas Twiddy | Production Manager |
| Sound | Muir Mathieson | Conductor |
| Sound | Kenneth V. Jones | Music |
| Costume & Make-Up | Freddie Williamson | Makeup Artist |
| Editing | Tom Simpson | Editor |
| Art | Allan Harris | Art Direction |
| Camera | Ernest Day | Camera Operator |
| Sound | H.L. Bird | Sound |
| Sound | Roy Baker | Sound Editor |
| Costume & Make-Up | Anne Box | Hairdresser |
| Camera | Desmond Dickinson | Director of Photography |
