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During the Mexican Revolution, a peasant named El Vasco (Milian) starts a revolt in his town by killing the army colonel in charge. Rebel leader and self-appointed General Mongo (Bódalo) soon arrives on the scene and hires El Vasco to his revolutionary gang. However, Mongo is more interested in gaining fortune for himself than for his country. Yodlaf Peterson (Nero), a Swedish mercenary arrives in Mexico to sell guns to General Mongo. The safe containing the money is locked and only Professor Xantos (Rey) knows the combination. Xantos is the leader of a student counter-revolution that opposes violence, and is held in a prison by the United States army, after he tried to find funding from the US and did not agree to give the monopoly of his country's entire oil wealth in return.
El Vasco dislikes the suit-wearing Peterson and calls him a "penguin", but at the suggestion of General Mongo, the two reluctantly join forces and set out to capture Xantos. Their task is made harder by the American army and a wooden-armed American named John (Palance), who wants to exact revenge on Peterson, his former business partner. Peterson had left John to die after he was crucified, and his pet hawk had to peck his right hand off to save him. In order to maximize their personal gain and to support Xantos' rebel fighters, El Vasco and Peterson have to doublecross Mongo. They receive help from Lola (Berben), the leader of Xantos' rebel group, who El Vasco falls for, and her group of young revolutionaries.
western, violence, sadist, flashback