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Lyle Talbot as Lt. Bob Bennett |
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Irving Pichel as Dr. Herbert Stander |
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Julie Bishop as Joan Martel |
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Sheila Bromley as Poison Mary Slavish |
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Anthony Averill as Dirk - Stander's Aide |
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Russell Hopton as Harry 'The Carver' Bogard |
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Julian Madison as Paul - Stander's Aide |
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Eddie Holden as Ole Olson |
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Wheeler Oakman as John Ritter |
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Stanley Blystone as Capt. Mike Briggs |
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Leander De Cordova as Ezra Matthews |
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Demetrius Alexis as Steve Murano |
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Skelton Knaggs as Jesse Bixel |
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Carleton Young as Reporter |
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William N. Chapman as Bill |
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Jack Gardner as Reporter |
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Adia Kuznetzoff as Adolph Krantz |
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Bert LeBaron as Sailor |
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Fred Walton as Dr. Beemish |
| Directing | Victor Halperin | Director |
| Production | Sigmund Neufeld | Producer |
| Writing | Jack London | Story |
| Writing | Harvey Huntley | Writer |
| Writing | George Wallace Sayre | Writer |
| Production | Ben Judell | Producer |
| Camera | Jack Greenhalgh | Director of Photography |
| Editing | Holbrook N. Todd | Editor |
| Art | Fred Preble | Art Direction |
| Sound | Hans Weeren | Sound Engineer |
| Sound | David Chudnow | Music Director |