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Donald Meek as Dr. Crabtree |
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John Hamilton as Insp. Carr |
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Robert Middlemass as Boris Seminoff |
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Thelma Tipson as Dolly Demarest |
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Walter Fenner as Ian Stevens |
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Jane Bramley as Mae Norton |
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Frank McNellis as Monitor Man (uncredited) |
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Harry Tyler as Assistant Director (uncredited) |
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Herschel Mayall as Medical Examiner (uncredited) |
| Directing | Joseph Henabery | Director |
| Writing | Burnet Hershey | Adaptation |
| Writing | S.S. Van Dine | Writer |
| Camera | Edwin B. DuPar | Director of Photography |
