Pinto, Paco and Pepe, three street musicians, arrive in a village in Mexico after the gang of El Supremo, a psychopath who believes himself to be the heir of Montezuma, have made a trail of blood. The only survivor gives the three the map of Montezuma’s treasure, hidden in the ruins of a temple, where El Supremo has his lair. The three decide to give the map to Pecos, the gunslinger.