In the wake of the Persian invasion of Greece, the Athenian general Themistocles orchestrates a desperate defense of his homeland. As the Persian forces advance, burning cities and threatening the very existence of the Greek city-states, Themistocles must navigate internal political divisions and convince his fellow Greeks to unite against a common enemy. With the fate of their civilization hanging in the balance, the Greeks must make a stand, leading to a climactic naval confrontation that will determine the future of the region.