Robert Siodmak Director Nancy Kelly Pat Lindsey Actor Richard Carlson Dr. Geoffrey Burton Actor Albert Basserman Dr. Storm Actor Miles Mander Prof. Langner Actor Walter Kingsford Heydt Actor Martin Kosleck George Tieler Actor Marion Martin Blond Nurse Actor Oscar O'Shea Pa Prescott Actor Jay Dratler Screenwriter John F. Seitz Cinematographer Arthur P. Schmidt Film Editing Haldane Douglas Art Director Hans Dreier Art Director