Over a thousand years ago Princess Celestia banished her sister Princess Luna to the moon. What most pony's don't know is that Celestia also had a twin brother Prince Accretion, the Prince of Stars. Jealous of the fact that his twin sister could control the sun, the one star he could not control, he manipulated Luna into becoming Nightmare Moon and together tried to destroy Princess Celestia. After failing to beat her because of the Elements of Harmony they were both banished from the kingdom. Luna to the moon and Accretion to the Frozen Nurth. Accretion meets a human man and together they travel to Canterlot to wreak havoc on Princess Celestia and all of Equestria.