My Little Pony: Haunting of Equestria

In her youth Princess Celestia, along with her mentor Star Swirl the Bearded, once travelled to many different worlds using magical mirror portals, but the portals were closed when the travellers discovered how dangerous they could be.

Meanwhile, Nightmare Night comes to Ponyville, and though excitement fills the air, one little pony’s fear threatens to reopen one of the portals, and let loose unknown darkness into Equestria!