Steve Forrest

as Warden Charles Casey

as Will Mannon

as General Sline

as Gordon

as Tom Hunter

as Greg Savitt

as Conrad Hunter

as Lou Brackett

as James Devlin

as Willard North

as Dan Jones

as Clint Burton

as Paul Keller

as Clint Mabry

as Terry Matthews

as Eddie Kelvaney

as Prof. Paul Dupin

as Dirk De Jong

as Lobo Nagalaski

as Passenger on Train (uncredited)

as Photographer on Crane (uncredited)

as Lt. Floyd (uncredited)

as Young Man

as Holtz