I found the concept of them doing this sidequel/sequel/prequel to 300 focusing on Themistokles, if for no other reason than (if my simplistic understanding of history is correct) Themistokles was maybe the main reason that Leonidas and his Spartans (and the rest of the troops at the Hot Gates) lived more than an hour. His naval forces prevented Xerxes from simply putting half his troops on a boat and sailing around Leonidas & Co long before they knew about the 'secret goat path.' In 300, its depicted as if a storm wrecks all their ships, leaving them to have to go through the Spartans to get anywhere - completely ignoring this massive contribution. So focusing this movie on him struck me as an apology from the start, but it does sound like they made a good movie out of it. Might have to see this one.