Bela Lugosi
Dr. Charles Kessler
Polly Ann Young
Virginia Kessler
John McGuire
Ralph Dickson / Paul Dickson
Clarence Muse
Evans the Butler
George Pembroke
Lt. Williams
Betty Compson
Mrs. Kessler
Ernie Adams
Jules Mason, caretaker
Ottola Nesmith
Mrs. Mason
Terry Walker
Cecile Mannix, maid
Fred Kelsey
Detective Ryan
Jack Mulhall
Jim, a detective
Fred Aldrich
Guard at Ralph's Execution (uncredited)
Lloyd Ingraham
Psychiatrist (uncredited)
Robert Strange
Kirby--Coroner (uncredited)
Dorothy Vernon
Kessler's Cook (uncredited)
Robert F. Hill
Trial Judge (uncredited)