In ancient Greece, brothers Grenos and Huros are trained in Pankration, a martial art that combines boxing and wrestling, from a young age. Their island home of Lemnos is invaded by Spartians, who destroy their town and kill its inhabitants. Huros is taken captive, and Grenos is sold into slavery. Grenos, driven by a desire for strength and a promise to his brother, strives to survive as a slave with the goal of reuniting with Huros at the Olympic Games.
