Stuart Whitman
Dale Nelson / Arthur
Carol Lynley
Cynthia Lee Albright
Roddy McDowall
Martin Ashley
Lauren Bacall
Dr. Edwina Beighley
Olive Deering
Mrs. Mellon
Ossie Davis
Capshaw
Donald Buka
Psychologist
Paulene Myers
Dr. Walden (as Pauline Myers)
Evadne Baker
Intern
Robert J. Wilke
Technician Mike Newton (as Robert Wilke)
Bert Freed
Frank Josephson
Judith De Hart
Matron
Judson Laire
Harley Manning
Jonathan Gilmore
A Young Mental Patient
Templeton Fox
Miss Lindsey
William Douglas
Paranoid Patient
Merritt Bohn
Jury Foreman
Don Marshall
Singer
Crew
Denis Sanders
Director
Sydney Boehm
Screenplay
Winfred Van Atta
Novel
Aaron Rosenberg
Producer
Sam Leavitt
Cinematography
Louis R. Loeffler
Editor
Hilyard M. Brown
Art Direction
Jack Martin Smith
Art Direction
Paul S. Fox
Set Decoration
Walter M. Scott
Set Decoration
Moss Mabry
Costume Design
Margaret Donovan
Hairstylist
Ben Nye
Makeup Artist
Harry Maret
Makeup Artist
Mary Westmoreland
Hairstylist
Joseph E. Rickards
Assistant Director
Ad Schaumer
Assistant Director
Ed Jones
Props
Robert O'Brien
Sound
Elmer Raguse
Sound
L.B. Abbott
Special Effects
Emil Kosa Jr.
Special Effects
Kenneth Lang
Gaffer
Lou Pazelli
Key Grip
Frank Powolny
Still Photographer
Ollie Hughes
Wardrobe Master
Wesley Trist
Wardrobe Master
Teresa Brachetto
Script Supervisor
Harold Goodwin
Dialogue Coach
Jerry Goldsmith
Original Music Composer