Broderick Crawford as Rollo Lamar

Ralph Meeker as Geraldo 'Jerry' Barker aka Iceman

Reed Hadley as Special FBI Agent James Madden

William Talman as William 'Machine Gun' Mason

Lon Chaney Jr. as Leonard M. 'Alamo' Smith

Charles Bronson as Benny Kelly

Felicia Farr as Emily Euridice Evans

Roy Roberts as Chief Ranger Will Erickson

Willis Bouchey as Robertson Lambert

Peter J. Votrian as Danny Lambert

Robert Bray as Ranger McCormick

William Boyett as Ranger at Park Exit (uncredited)

Nelson Leigh as Madden's FBI Supervisor (uncredited)

Gregg Martell as Accomplice on Fishing Boat (uncredited)

Bill McLean as Dipsy (uncredited)

Jan Merlin as Tommy (uncredited)

Joe Ploski as Convict (uncredited)

Stafford Repp as Police Warden Machek (uncredited)

Harry Wilson as Inmate Who Starts Fight (uncredited)