Whitaker Selby, Lester Kato, and Etienne Devereaux, three eccentric gunmen, discover they are brothers. Their father left them all a mine located in Laredo, Texas. But they discover that Julius Caesar Fuller, the town's greedy landowner (who fancies himself Caesar) has taken control of their mine. They band together to fight Caesar and his black clad gunmen to repossess their mine and avenge their father.

Four muscular heroes fight the evil ruler of an oppressed people.

Though Genghis Khan eventually sought peace with the West, his death in 1227 AD puts into power his three war-like sons: Sayan, Susdal, and Kin Khan. These sons quickly overrun the city of Tuleda and take prisoner Princess Bianca, though young Prince Alessio escapes. Hercules comes to the rescue of Bianca, winning her freedom in a tournament in exchange for becoming a slave himself. Forces from the West soon come to re-take Tuleda and Hercules -- freed from his bonds -- helps to dispatch Genghis Khan's three sons while again saving Bianca and reuniting her with her young brother.