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)