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Robert Beatty as Dr. Paul Rankin |
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Mervyn Johns as Dr. Bruckner, the Beast of Ravensbruck |
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Margaretta Scott as Sister 'Johnnie' Johnson |
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Nova Pilbeam as Tracy Heart |
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Sybilla Binder as Martha Lert |
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Marie Lohr as Mrs. Cole |
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Karl Stepanek as Professor Inman |
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Alan Wheatley as M. W. Kennedy |
| Directing | Paul L. Stein | Director |
| Writing | Jack Whittingham | Writer |
| Production | Louis H. Jackson | Producer |
| Sound | Hans May | Original Music Composer |
| Writing | Guy Morgan | Original Story |
| Sound | Harold V. King | Recording Supervision |
| Directing | Leigh Aman | Assistant Director |
| Camera | Moray Grant | Camera Operator |
| Costume & Make-Up | L.M. Tweedy | Wardrobe Supervisor |
| Costume & Make-Up | Henry Hayward | Makeup Artist |
| Costume & Make-Up | A. G. Scott | Hairstylist |
| Sound | Eva Catchpole | Sound Editor |
| Editing | Joseph Sterling | Editor |
