The plot revolves around King Leonidas , who leads 300 Spartans into battle against the Persian "god-King" Xerxes oand his invading army of more than 300,000 soldiers. As the battle rages, Queen Gorgo attempts to rally support in Sparta for her husband. The story is framed by a voice-over narrative by the Spartan soldier Dilios . Through this narrative technique, various fantastical creatures are introduced, placing 300 within the genre of historical fantasy.