Stonehenge, once a cannon used to destroy asteroids, is now a threat to the United Equestrian Allied Forces. UEAF must respond to this threat in order to protect the skies over the Equestrian Mainland from the Equisians.

An evil force has appeared and looks not to rule Equestria, but to destroy it. It's up to the efforts of Apple Bloom and 3 other fillies that were prophesied by a time traveler from the future to save not only Equestria, but the whole Universe!