Princess Twilight Sparkle has been the sole ruler of Equestria for ten years. The nation thrived under her rule, even more so than with her predeccessors. No catastrophe in sight. Until now...

Monsters unlike Equestria has ever seen suddenly appeared. Taking control of land, air and sea, Twilight and her little ponies stand helpless before the rampage. But as fate has it, and always will, a hero always comes to the rescue.