Steven Hill
— Dan Briggs
Barbara Bain
— Cinnamon Carter
Greg Morris
— Barney Collier
Peter Lupus
— Willy Armitage
Martin Landau
— Rollin Hand
Mary Ann Mobley
— Crystal Walker
Cyril Delevanti
— Anton Cardinal Vossek
Joseph Ruskin
— Colonel Scutari
Oscar Beregi Jr.
— The Commandant
William Wintersole
— The Captain
Monte Markham
— Tosk
Bob Johnson
— Person on Tape (voice) (uncredited)
George Margo
— Sergeant (uncredited)
Norbert Siegfried
— Officer (uncredited)
Jon Silo
— Pick Pocket Victim (uncredited)
Noble 'Kid' Chissell
— Prison Guard (uncredited)