New Elements have been discovered in the lands beyond Equestria and a new group of villains has emerged. The Knights of Harmony have come to take the originals from Twilight and the gang, and it will take all their friends, old and new, to win the climactic showdown! But first, a mysterious painting brings up memories of the past, forcing Celestia and Luna to confront their fears. And, meanwhile, Marble Pie is headed off to college, and only Pinkie Pie can plan a suitably super party. But she's having trouble feeling happy with her sister heading so far away. Will she be up to the task?