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Vincent Price as Francois Delambre |
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Brett Halsey as Philippe Delambre |
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John Sutton as Insp. Beecham |
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David Frankham as Ronald Holmes, alias Alan Hinds |
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Dan Seymour as Max Berthold |
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Danielle De Metz as Cecile Bonnard |
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Jack Daly as Granville (reporter) |
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Janine Grandel as Mme. Bonnard |
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Richard Flato as Sgt. Dubois |
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Gregg Martell as Cop |
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Barry Bernard as Lt. MacLish |
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Pat O'Hara as Insp. Evans |
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Francisco Villalobos as Priest |
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Joan Cotton as Nurse |
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Michael Mark as Gaston (watchman) |
| Writing | Edward Bernds | Writer |
| Directing | Edward Bernds | Director |
| Sound | Bert Shefter | Original Music Composer |
| Editing | Richard C. Meyer | Editor |
| Production | Bernard Glasser | Producer |
| Camera | Brydon Baker | Director of Photography |
| Sound | Paul Sawtell | Original Music Composer |
| Art | John B. Mansbridge | Art Direction |
| Sound | Sidney Cutner | Orchestrator |
| Art | Lyle R. Wheeler | Art Direction |
| Sound | Bernard Freericks | Sound |
| Writing | George Langelaan | Short Story |
| Editing | Orven Schanzer | First Assistant Editor |
| Crew | Roy Webb | Additional Music |
| Art | Walter M. Scott | Set Decoration |
| Directing | Byron Roberts | Assistant Director |
| Costume & Make-Up | Hal Lierley | Makeup Artist |
| Art | Joseph Kish | Set Decoration |
| Lighting | Robert A. Petzoldt | Electrician |
