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Boris Karloff as Dr. Victor Sartorius |
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Joan Wyndham as Eve Rowe |
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Arthur Margetson as Roger Clifford |
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Mona Goya as Yvonne Clifford |
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Anthony Ireland as Capt. Arthur Halliday |
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Morton Selten as Sir Charles Clifford |
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Nina Boucicault as Mary Clifford |
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Gibb McLaughlin as Jacques |
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J.H. Roberts as Chalmers |
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Victor Rietti as Doctor Bousquet |
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Wilfrid Caithness as Morrocan Official |
| Directing | Henry Edwards | Director |
| Writing | Cyril Campion | Screenplay |
| Production | Julius Hagen | Producer |
| Writing | Heinrich Fraenkel | Adaptation |
| Editing | Michael C. Chorlton | Editor |
| Art | James A. Carter | Art Direction |
| Production | Edward L. Alperson | Executive Producer |
| Writing | H. Fowler Mear | Screenplay |
| Sound | W.L. Trytel | Original Music Composer |
| Camera | Sydney Blythe | Director of Photography |
| Camera | William Luff | Director of Photography |
| Writing | Alice Campbell | Novel |
