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Don Terry as Cmdr. Don Winslow |
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Claire Dodd as Mercedes Colby |
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John Litel as Spencer Merlin |
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Walter Sande as Lt. Red Pennington |
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Anne Nagel as Misty Gaye |
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Wade Boteler as Mike Splendor |
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Ben Taggart as John Blake |
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John Holland as Paul Barsac |
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Lane Chandler as Henchman Corley |
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Ethan Laidlaw as Henchman Spike |
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Peter Leeds as Seaman Chapman |
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Robert Barron as Henchman Prindle |
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Kurt Katch as The Scorpion |
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Ray Teal as Gang Radioman Barker |
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Dirk Thane as Lt. Cdr. Grady |
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Herbert Rawlinson as Admiral Warburton [Ch. 1] |
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Samuel S. Hinds as The CINCUS [Ch. 1] |
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Kenneth Harlan as Capt. Holding [Ch. 1] |
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Arthur Loft as Enemy Sub Capt. Tranker [Ch. 1] |
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Paul Scott as Capt. Fairfield, of the "Batavia" [Chs. 1-2] |
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Jerry Mandy as Tangita Jim [Chs. 2, 10] |
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Heenan Elliott as Capt. Sanders, of the "Tarleton" [Chs. 3-4] |
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Paul Bryar as Saboteur Kramer [Chs. 3-4] |
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Edward Hearn as Lead Henchman at Mill [Ch. 5] |
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Iron Eyes Cody as Native Henchman at Mill [Ch. 5] |
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Frank Lackteen as Witch Doctor Koloka [Chs. 6-7] |
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Guy Kingsford as Sub Capt. Jackson [Chs. 7, 9] |
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Ken Terrell as Sam Munn, henchman [Ch. 8] |
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Jack Rockwell as Henchman Butch [Ch. 8] |
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Irving Mitchell as Gang Chemist Taylor [Chs. 8-9] |
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Eddie Polo as Taylor's Lab Assistant [Ch. 8] |
| Writing | Paul Huston | Screenplay |
| Directing | Ford Beebe | Director |
