In ancient Greece, the gods are desperate to prevent the rise of evil. Zeus (Luke Evans), King of the Gods, learns of a prophecy that foretells the downfall of Olympus at the hands of a mortal. To prevent this catastrophe, Zeus chooses a brave warrior, Theseus (Henry Cavill), to defeat the dark forces of King Xerxes (Mickey Rourke) and his army of invincible Immortals.