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
