Directed by Nick Grinde
Produced by Wallace MacDonald
Written by Robert D. Andrews, Karl Brown
Cinematography by Benjamin H. Kline
Film Editing by Charles Nelson
Art Direction by Lionel Banks
Assistant Director : Milton Carter
Cast
Boris Karloff (Dr. John Garth)
Evelyn Keyes (Martha Garth)
Bruce Bennett (Dr. Paul Ames)
Edward Van Sloan (Dr. Ralph Howard)
Ben Taggart (Warden Thompson)
Pedro de Cordoba (Victor Sondini)
Wright Kramer (George Wharton)
Bertram Marburgh (Stephen Barclay)
Don Beddoe (Captain McGraw)
Robert Fiske (District Attorney)
Kenneth MacDonald (Anson)
Frank Richards (Otto Krone)
Ernie Adams (Sam, the hospital attendant)
Stanley Brown (Prison Gate Guard)
Frederick Burton (The Governor)
Jack Cheatham (Ptl. Olson)
Edward Earle (Dr. Nichols)
James T. Mack (Butler)
Charles Trowbridge (Judge Braden)
Gohr Van Vleck (Police Dispatcher)
Barton Yarborough