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