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