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