Dr. Constance Petersen

John Ballantine

Dr. Murchison

Dr. Alexander Brulov

Dr. Fleurot

Dr. Graff

Dr. Hanish

Dr. Galt (uncredited)

Mr. Garmes

Harry

Mary Carmichael

House detective

Det. Lt. Cooley

Det. Sgt. Gillespie

Hotel masher

Matron (uncredited)

Railway Gateman (uncredited)

Ticket Taker (uncredited)

Gateman (uncredited)

John Ballantine as a Boy (uncredited)

Nurse (uncredited)

Dr. Anthony Edwardes (uncredited)

Man Leaving Elevator (uncredited)

John Ballantine's Brother (uncredited)

Sheriff (uncredited)

Hallett - Railroad Clerk (uncredited)

Policeman at Train Station (uncredited)

Dr. Brulov's Housekeeper (uncredited)

Police Captain (uncredited)

Norma Cramer (uncredited)

Secretary at Police Station (uncredited)

Bellboy (uncredited)