as Dr. Constance Petersen

as John Ballantine

as Dr. Alexander Brulov

as Dr. Murchison

as Mary Carmichael

as Dr. Fleurot

as Mr. Garmes

as House detective

as Dr. Graff

as Harry

as Hotel masher

as Det. Lt. Cooley

as Det. Sgt. Gillespie

as Dr. Hanish

as Matron (uncredited)

as Railway Gateman (uncredited)

as Ticket Taker (uncredited)

as Gateman (uncredited)

as John Ballantine as a Boy (uncredited)

as Nurse (uncredited)

as Dr. Anthony Edwardes (uncredited)

as Man Leaving Elevator (uncredited)

as John Ballantine's Brother (uncredited)

as Sheriff (uncredited)

as Hallett - Railroad Clerk (uncredited)

as Policeman at Train Station (uncredited)

as Dr. Brulov's Housekeeper (uncredited)

as Police Captain (uncredited)

as Dr. Galt (uncredited)

as Norma Cramer (uncredited)

as Secretary at Police Station (uncredited)

as Bellboy (uncredited)