Sunny, Izzy, Hitch, Zipp, and Pipp found the Locket of Souls and it called the spirits of the Mane 6, Starlight Glimmer, the Young Six, and the Pillars. But trouble arises, when an old foe has returned to reign destruction upon the world. The Main 5 will have to team up with the veterans if they wish to save their world.

The past will be revealed.