Doctor Whooves peers over the Mane 6's work. "Ah ha! THE RETURN OF NIGHTMARE MOON. Even I know that story. After a thousand years of banishment, Nightmare Moon returned and tried to plunge Equestria into eternal night. To stop here, the six of you adventured to the Castle of the Two Sisters. Retrieving the six Elements of Harmony, you harnessed their power to defeat Nightmare Moon, and saved the world."
"That was the most important night of our lives. It's what brought us together. It was the start of the friendship we all share," Twilight says. "But I don't understand. That night was perfect. Why do we need to go back?"
"Look", Rainbow Dash says. "If the map says we need to go, then we do. You said it yourself: the map doesn't lie. We'll find out once we get there."
With that, the six of them, Doctor Whooves, and Derpy file into the TARDIS. "Right. Setting course for The Castle of the Two Sisters. I'll set it so we get there a bit before your past selves show up. It'd be bad to alter the timeline any more than necessary."