Midwest preacher's son 'Butch' Parker gets a pardon after a well-deserved year in jail on promise never again to commit crimes in Wyoming. He befriends naive ranch hand Harry, would be-crime king the Sundance Kid. In relative Mike Cassidy's gang, they rob targets defended by the ruthless Pinkerton Agency men. The gang becomes the Wild Bunch after Mike is killed and Butch takes his place, by now reputed Robin Hoods as the railroad is so unpopular. Having faked their death, they retire to a pueblo in Mexico with shared girl-friend, photographer Etta Place. Sergeant Sanchez wants the bounty on their heads, or a larger share of their loot.