Welcome to 480, BC. The Persians, one of the greatest nations to ever walk the Earth, attack Greece with only one goal in mind: to conquer their lands and turn them into slaves. It's obvious that the invaders are stronger in numbers and have better weapons - there's no stopping them. However, a group of valiant men - 300 in total - finds a way to defeat the Persians. The thing is - Thermopylae is the only passage into the country, and it's incredibly narrow. These warriors known every inch of this place and almost defeat the entire army. Unfortunately, to their great surprise, a citizen of Greece betrays them and tells the Persians how to outmaneuver the heroes.