Boris Karloff (Dr. John Garth)
Evelyn Keyes (Martha Garth)
Bruce Bennett (Dr. Paul Ames)
Edward Van Sloan (Dr. Ralph Howard)
Ben Taggart (Warden Thompson)
Barton Yarborough (Stephen Barclay)
Charles Trowbridge (Actor/Actress)
Robert Fiske (District Attorney)
Kenneth MacDonald (Anson)
Frank Richards (Otto Kron)
Pedro de Cordoba (Victor Sondini)
Wright Kramer (George Wharton)
Bertram Marburgh (Stephen Barclay)
Don Beddoe (Captain McGraw)