A naïve rookie in the Mexican highway patrol must adapt in order to survive as he contends with widespread corruption, dangerous drug runners and the consequences of his often morally gray actions.

Jack Beauregard, an ageing gunman of the Old West, only wants to retire in peace and move to Europe. But a young gunfighter, known as "Nobody", who idolizes Beauregard, wants him to go out in a blaze of glory. So he arranges for Jack to face the 150-man gang known as The Wild Bunch and earn his place in history.