Smooth and lethal gunfighter Lee Calloway helps three bandit brothers escape from jail under the condition that they give him fifty percent of the stolen gold they have hidden. Of course, the treacherous sibling trio don't plan on keeping their end of the deal.
Unknown to anybody else but himself The Stranger arrives in an abandoned town where he witnesses the slaughter of Mexican soldiers by a gang led by Aguila. The Stranger threatens Aguila to denounce him if he does not accept to let him take part in the theft of a shipment of gold. The plan is a success but when The Stranger claims his due, he gets a good beating instead. However The Stranger manages to escape with the gold. The bandits, who want his skin, pursue him. But The Stranger is not the kind to get caught so easily...
Attalus, a war prisoner by Rome, proves his valor in the arena, becomes a gladiator trainer, conquers the women's hearts and the men's envy, and saves Rome from a political plot to a usurper to occupy the throne.