Beginning:
The movie starts with the usual narration gig but with Xerxes narrating. Xerxes tells how fierce the Persian warriors are just like what they did in the first movie. It also shows some parts of Xerxes beginnings. This part is just like the first movie but Persian style.
Then it opens with Xerxes sitting in his "portable" throne room minus the women. He sits there staring at the empty room filled with rage. The camera then focuses his scar from his previous endeavor with Leonidas. You see him twitching as if insane. So this scene is just him reflecting. Then *POOF!* more flashbacks start to appear. So it tells how he came to be until the beginning of the Greco-Persian War
Middle:
Just like the first movie the middle will show the battles fought by the Persians. Then the Battle of Thermopylae but in the Persians perspective.
End:
Then it all leads up to the death of Leonidas. It then shows Xerxes with his scar being focused in his portable throne room . He stands and walks out his throne room . And outside are 300,000 bloodthirsty Persians ready for the last battle of the Greco-Persian War, The Battle of Plataea. So the movie ends like how the last movie ended but with Persians. So it ends with a cliffhanger that will lead-up to the third movie.
So basically this movie is like a Persian style 300. Hope you liked it.