For three months the citizens of the ancient Grecian city state of Thenis have been holding off the attacking forces of Praximedes, the power-mad ruler of Seronikos. In an effort to avoid more bloodshed, it is agreed that the battle will be decided by a private combat between the leading warrior of each side. Aided by Candia, his seductive mistress, Praximedes persuades Atlas, the Olympic champion, to represent him in the contest. Atlas is victorious over Indros, the champion of Thenis; and the citizens of Thenis are forced to open their gates to the triumphant Praximedes. Upon observing the despot's tyrannical rule, however, Atlas leaves the city with Candia, with whom he has fallen in love. They join forces with rebel troops led by Indros and trick Praximedes into taking his army out of the city. When he returns, Atlas and the rebels are waiting. In the final battle, Atlas slays Praximedes, and peace is restored to Thenis.