Sergei Kowalski (Franco Nero), a mercenary only out for himself and a few dollars, joins up with a Mexican peasant-turned-revolutionary, Paco Roman (Tony Musante), when the price is right. No longer content to toil for the rich and powerful, Roman plans to bring a new order to Mexico by force with his small ragtag group. While Roman and Kowalski are outnumbered facing the Mexican army, they also have to contend with Curly (Jack Palance), a vengeful killer out for blood.