Twilight and Rainbow have just started a new life with their newly-adopted daughter, Scootaloo, but the filly’s old parents have returned with a vengeance.
She can swim far and wide across the waters of Equestria, but it's not enough. There are places above those waters, places she plans to reach. Where biology failed her, her mind would succeed. Equestria better be ready, because she plans to visit!
Twilight learns of Sombra's past, and finds him alive but weakened. She decides to learn how to use his Dark Magic for Good, by taking him back to Ponyville.