Thought to have been killed as a filly, Twilight Sparkle is discovered to be returning to Canterlot. Instead of a joyous reunion awaiting her, a trail of destruction follows her as Celestia and Luna struggle to discover how, and why, she's returned.
Pinkie has a secret. So far, she's kept it from everyone, but Twilight can tell that something's wrong with her. So she offers what vague support she can… until Pinkie takes her into the basement to show her.