Joyce Webster, aka Jane Marvin
Beverly Garland
Dr. Eric Lorimer
Bruce Bennett
1st Male Nurse (uncredited)
John Frederick
Louann
Ruby Goodwin
Third Male Nurse (uncredited)
Ken Kane
Alligator-headed Paul
Boyd Stockman
Toby
Vince Townsend Jr.
2nd Male Nurse (uncredited)
Lee Warren
Manon
Lon Chaney Jr.
Dr. Mark Sinclair
George Macready
Mrs. Lavinia Hawthorne
Frieda Inescort
Paul Webster
Richard Crane
Dr. Wayne McGregor
Douglas Kennedy
Patient 'Number Six' (uncredited)
Bill Bradley
Conductor
Hal K. Dawson
Porter
Dudley Dickerson
Editor
Harry Gerstad
Supervising Film Editor
Makeup Artist
Dick Smith
Director
Roy Del Ruth
Director of Photography
Karl Struss
Ben Nye
Screenplay
Orville H. Hampton
Story
Charles O'Neal
Producer
Jack Leewood
Original Music Composer
Irving Gertz
Art Direction
John B. Mansbridge
Lyle R. Wheeler
Set Decoration
Joseph Kish
Walter M. Scott
Hairstylist
Eve Newing
Assistant Director
Herbert E. Mendelson
Production Manager
Property Master
George Westenhiser
Sound
W.D. Flick
Sound Effects
Arthur Cornell
Special Effects
Fred Etcheverry
Stunts
Bob Bryant
Costume Supervisor
Ollie Hughes
William McCrary
First Assistant Editor
Orven Schanzer
Script Supervisor
Mary Coleman