Béla 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)