Princess Celestia becomes evil and joins forces with Nightmare Moon to enslave all of pony kind! So Twilight Sparkle, Rarity, and the rest of the team are forced to except help from the most unlikely allies. Featuring sir Sombra, sir Discord the first, and ms. Crystalis with her chageling army! Will Twilight Sparkle and her old and new friends be able to stop Celestia in time?