Dwight Wilson
Patricia Merrick, also known as Mlle. Mystera
Dr. Paul Cornelius
Horace Merrick
Mattie (as Gertrude W. Hoffman)
Chief of Detectives John F. O'Hara
Joe Valerie
Mrs. Marble
Police Car Driver (uncredited)
Paddywagon Cop (uncredited)
Detective Schultz (uncredited)
Detective Brady (uncredited)
Police Desk Sergeant Hamilton (uncredited)
Police Radio Announcer (voice) (uncredited)
Policeman in Car (uncredited)