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Peter Cushing as Dr. Victor Stein |
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Francis Matthews as Dr. Hans Kleve |
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Eunice Gayson as Margaret Conrad |
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Michael Gwynn as Karl |
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John Welsh as Bergman |
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Lionel Jeffries as Fritz |
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Oscar Quitak as Dwarf |
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Richard Wordsworth as Up Patient |
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John Stuart as Inspector |
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Michael Ripper as Kurt |
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Charles Lloyd Pack as President |
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Arnold Diamond as Molke |
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Marjorie Gresley as Countess Barscynska |
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Anna Walmsley as Vera Barscynska |
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George Woodbridge as Janitor |
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Ian Whittaker as Boy |
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Avril Leslie as Girl |
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John Tatham as Manservant (uncredited) |
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Eugene Leahy as Kleine (uncredited) |
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Charles Gilliard as Policeman (uncredited) |
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Jimmy Charters as Patient (uncredited) |
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Julia Nelson as Inga (uncredited) |
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Robert Brooks Turner as Joseph the Groom (uncredited) |
| Costume & Make-Up | Philip Leakey | Makeup Artist |
| Crew | George Baxt | Additional Dialogue |
| Crew | Hurford Janes | Additional Dialogue |
| Writing | Jimmy Sangster | Writer |
| Production | Michael Carreras | Executive Producer |
| Sound | Leonard Salzedo | Original Music Composer |
| Camera | Jack Asher | Director of Photography |
| Directing | Terence Fisher | Director |
| Production | Dorothy Holloway | Casting |
| Costume & Make-Up | Henry Montsash | Hairstylist |
| Editing | Alfred Cox | Editor |
| Production | Anthony Hinds | Producer |
| Art | Bernard Robinson | Production Design |
| Costume & Make-Up | Rosemary Burrows | Costume Design |
| Sound | Jock May | Sound Recordist |
| Sound | Alfred Cox | Sound Editor |
| Writing | მერი შელი | Characters |
