Ingrid Bergman
Dr. Constance Petersen
Gregory Peck
John Ballantine
Michael Chekhov
Dr. Alexander Brulov
Leo G. Carroll
Dr. Murchison
Rhonda Fleming
Mary Carmichael
John Emery
Dr. Fleurot
Norman Lloyd
Mr. Garmes
Bill Goodwin
House detective
Steven Geray
Dr. Graff
Donald Curtis
Harry
Wallace Ford
Hotel masher
Art Baker
Det. Lt. Cooley
Regis Toomey
Det. Sgt. Gillespie
Paul Harvey
Dr. Hanish
Jean Acker
Matron (uncredited)
Irving Bacon
Railway Gateman (uncredited)
Richard Bartell
Ticket Taker (uncredited)
Harry Brown
Gateman (uncredited)
Joel Davis
John Ballantine as a Boy (uncredited)
Jacqueline deWit
Nurse (uncredited)
Edward Fielding
Dr. Anthony Edwardes (uncredited)
Alfred Hitchcock
Man Leaving Elevator (uncredited)
Teddy Infuhr
John Ballantine's Brother (uncredited)
Victor Kilian
Sheriff (uncredited)
George Meader
Hallett - Railroad Clerk (uncredited)
Matt Moore
Policeman at Train Station (uncredited)
Constance Purdy
Dr. Brulov's Housekeeper (uncredited)
Addison Richards
Police Captain (uncredited)
Erskine Sanford
Dr. Galt (uncredited)
Janet Scott
Norma Cramer (uncredited)
Clarence Straight
Secretary at Police Station (uncredited)
Dave Willock
Bellboy (uncredited)