A tear in space has appeared inside Canterlot Castle, and Twilight Sparkle is called to investigate. But shortly after its appearance, an intruder is found to be looking for someone in particular: Twilight herself. When her crown is stolen, she must pursue the unknown thief through the tear and into a world utterly alien to her. And she must accomplish her goal before the tear closes itself, and she is trapped forever amongst these aliens.

A retelling of Equestria Girls