Full Credits
16 members

Beverly Garland
Joyce Webster, aka Jane Marvin

Bruce Bennett
Dr. Eric Lorimer

Lon Chaney Jr.
Manon

George Macready
Dr. Mark Sinclair

Frieda Inescort
Mrs. Lavinia Hawthorne

Richard Crane
Paul Webster

Douglas Kennedy
Dr. Wayne McGregor
Bill Bradley
Patient 'Number Six' (uncredited)

Hal K. Dawson
Conductor

Dudley Dickerson
Porter

John Frederick
1st Male Nurse (uncredited)

Ruby Goodwin
Louann
Ken Kane
Third Male Nurse (uncredited)

Boyd Stockman
Alligator-headed Paul
Vince Townsend Jr.
Toby
Lee Warren
2nd Male Nurse (uncredited)
27 members
Roy Del Ruth
Director
Herbert E. Mendelson
Assistant Director
Mary Coleman
Script Supervisor
Orville H. Hampton
Screenplay
Charles O'Neal
Story
Orville H. Hampton
Story
Jack Leewood
Producer
Herbert E. Mendelson
Production Manager
Karl Struss
Director of Photography
Irving Gertz
Original Music Composer
Arthur Cornell
Sound Effects
W.D. Flick
Sound
Lyle R. Wheeler
Art Direction
John B. Mansbridge
Art Direction
Joseph Kish
Set Decoration
Walter M. Scott
Set Decoration
George Westenhiser
Property Master
Eve Newing
Hairstylist
Ben Nye
Makeup Artist
William McCrary
Costume Supervisor
Ollie Hughes
Costume Supervisor
Dick Smith
Makeup Artist
Harry Gerstad
Editor
Harry Gerstad
Supervising Film Editor
Orven Schanzer
First Assistant Editor
Fred Etcheverry
Special Effects
Bob Bryant
Stunts