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
