As Leonidas angrily departs, a messenger from Xerxes appears, rewarding the Ephors for their covert support.
Although the Ephors have denied him permission to mobilize Sparta's army, Leonidas gathers three hundred of his best soldiers in the guise of his personal bodyguard; they are joined along the way by Arcadians.
On the third day, the Persians, led by Ephialtes, traverse the secret path, encircling the Spartans. Leonidas seemingly kneels in submission, allowing Stelios to leap over him and kill the general. Leonidas rises and throws his spear at Xerxes; barely missing him, the spear cuts across and wounds his face, proving the God-King's mortality.
Nunnari discovered Frank Miller's graphic novel 300, which impressed him enough to acquire the film rights.
Leonidas then visits the Ephors, proposing a strategy to drive back the numerically superior Persians through the Hot Gates; his plan involves building a wall in order to funnel the Persians into a narrow pass between the rocks and the sea.
The Ephors consult the Oracle, who decrees that Sparta will not go to war during the Carneia.
Like the comic book, the adaptation also used the character Dilios as a narrator.
Snyder used this narrative technique to show the audience that the surreal "Frank Miller world" of 300 was told from a subjective perspective.