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Humphrey Bogart | Richard Mason |
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Alexis Smith | Evelyn Turner |
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Sydney Greenstreet | Dr. Mark Hamilton |
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Rose Hobart | Kathryn Mason |
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Charles Drake | Prof. Norman Holsworth |
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Grant Mitchell | Dr. Grant |
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Patrick O'Moore | Det. Lt. Egan (as Pat O'Moore) |
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Ann Shoemaker | Nora Grant |
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Edwin Stanley | Phillips (as Ed Stanley) |
| |
Merritt B. Gerstad | Cinematography |
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Jack L. Warner | Executive Producer |
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Friedrich Hollaender | Music |
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Dwight Taylor | Writer |
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Curtis Bernhardt | Director |
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William Jacobs | Producer |
| |
Arthur T. Horman | Writer |
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Robert Siodmak | Writer |
| |
Alfred Neumann | Writer |
