"A psychologist takes on the daunting task of getting into the mind of prisoners. He must gain the trust and cooperation from a group of men who have no reason to help him and who might enjoy killing him."
Millard Mitchell
as James T. Connie
Gilbert Roland
as Punch Pinero
John Beal
as Dr. Wilson aka Doc
Marshall Thompson
as Blivens Scott
Alf Kjellin
as Clem Randall
Harry Morgan
as Dawson
Jay Adler
as Steve Kopac
Regis Toomey
as Dr. Gordon
Fay Roope
as Warden George Potter
Carleton Young
as Captain Haggarty
John Marley
as Knotty Johnson
Russ Conway
as Dr. Hughes
Byron Foulger
as Dr. Brint, Dentist
Charles Bronson
as Jocko
Jack Carr
as Harry Higgins
Joe Haworth
as Convict 9670
Dan Jackson
as Convict 1538
Chester Jones
as Convict 7546
Frank Mitchell
as Convict 3007
Vincent Renno
as Convict 9919
Paul Hoffman
as Convict
Allen Mathews
George Eldredge
Dick Cogan
Peter Virgo
George Stern
Joe Palma
as Convict Driver
Fred Kelsey
as Store Detective
Grace Lenard
as Waitress
Joe McTurk
as Big Benny
Shirley Mills
as Blonde Tilly
John Monaghan
as Test Guard
Dick Curtis
as Guard
Billy Nelson
Eddie Parker
as Guard on Dump Truck
Barney Phillips
as Baker Foreman
Carol Savage
as Mrs. Randall
Harry Stanton
as Banker
Charles Sullivan
as Driscoll
Hugo Fregonese
Director
Michael Blankfort
Screenplay
Donald Powell Wilson
Novel
Fred M. MacLean
Set Decoration
Edna Anhalt
Associate Producer
Edward L. Ilou
Art Direction
Lambert E. Day
Sound Engineer
Dimitri Tiomkin
Music Director
Edward Anhalt
Stanley Kramer
Producer
Guy Roe
Director of Photography
Gene Havlick
Editor
Rudolph Sternad
Production Design
Clem Beauchamp
Production Manager
Manuel Emanuel
Orchestrator
James E. Casey
Assistant Director
Harry Gerstad
Supervising Editor
Paul Marquardt
Herbert Taylor
Original Music Composer
George Parrish