Part of the Wibblyverse Continuity.
Side-story of Doctor Whooves: Friendship is Wibbly Series 1
Previous Story: Ruler of Everything
Next Story: Played on Strings

Discord's daughter has returned after a millennium's absence, and her parent couldn't be more thrilled to have her back. At least, they think they are. Meanwhile, the arrival of not one but two ancient deities in Ponyville is raising some questions for Twilight and her friends, and Celestia seems none too eager for a happy reunion.