Director
Ford Beebe
DIRECTOR
Ray Taylor
Stars (in credits order)
Don Terry
Cmdr. Don Winslow
Walter Sande
Lt. Red Pennington
John Litel
Spencer Merlin
Wade Boteler
Mike Splendor
Samuel S. Hinds
Adm. Colby - The CINC-US [Ch. 1]
Claire Dodd
Mercedes Colby
Anne Nagel
Misty Gaye
Ben Taggart
John Blake
Kurt Katch
The Scorpion
Herbert Rawlinson
Adm. Warburton [Ch. 1]
Dirk Thane
Lt. Cmdr. Grady [Chs. 1, 12]
John Holland
Paul Barsac
Arthur Loft
Tranker - Submarine Z-37 Captain [Chs. 1-2]
Paul Bryar
Kramer - [Chs. 3-4]
Ethan Laidlaw
Spike - Henchman
Robert Barron
Prindle - Henchman
Lane Chandler
Corley - Henchman
Peter Leeds
Chapman - Seaman
Jerry Mandy
Tangita Jim [Chs. 2, 10]
Iron Eyes Cody
Native Thug at Mill [Ch. 5] (uncredited)
William Desmond
Pat - Smelter Foreman [Ch. 5] (uncredited)
Heenan Elliott
Captain of the S.S. 'Tarleton' [Chs. 3-4] (uncredited)
Kenneth Harlan
Capt. Holding [Ch. 1] (uncredited)
Edward Hearn
Mill Henchman [Chs. 5-6] (uncredited)
Guy Kingsford
Jackson - Z-40 Submarine Captain [Chs. 7-9-10] (uncredited)
Frank Lackteen
Koloka [Chs. 6-7] (uncredited)
Bert LeBaron
Radio Room Henchman [Ch. 10] (uncredited)
John Merton
Destroyer 620 Helmsman [Chs. 1, 9] (uncredited)
Irving Mitchell
Taylor - the Chemist [Chs. 8-9] (uncredited)
Eddie Polo
Lab Assistant [Chs. 8-9] (uncredited)
Jack Rockwell
Butch Clint - Henchman [Ch. 8] (uncredited)
Buddy Roosevelt
Henchman-Helmsman [Ch. 3] (uncredited)
Paul Scott
Capt. Fairfield [Chs. 1-2] (uncredited)
Tom Steele
Diving Boat Raider [Chs. 10-11] (uncredited)
Ray Teal
Parker - Saboteur Radio Operator [Chs. 4-12] (uncredited)
Ken Terrell
Sam Munn (uncredited)
Dale Van Sickel
Sailor (uncredited)
Phil Warren
S.S. 'Baratavia' Crewman [Ch. 2] (uncredited)