Django comes to town to discover that his brother Steve, accused of robbing a bank, has been lynched. Django believes the real culprit is Sartana and challenges him to a duel. Just in time he discovers that the author of the crime is an important local figure and Django and Sartana join forces to punish him.

In ancient Rome, the people finally oust their despised king, Tarquinius, and declare the city a republic. Tarquinius makes an alliance with the Etruscan king, Porsenna, to take back power in Rome, but a Roman general, the heroic Mucius, sets out to stop him.