When a black and red alicorn appears in the Everfree Forest, Twilight and the others are sent to investigate. Unfortunately, this visitor is an incomprehensible mess and quickly drives the girls insane.
On a dark and stormy night, a fiendish scientist unveils the most terrifying invention to be unleashed upon the innocent world: My Little Pony: Friendship is Magic.
The Mane Six are joined by three others in a quest to use the Elements of Harmony one last time, as a brewing war between Tartarus and the free creatures of the world threatens to destroy Equestria forever.