Bómù Guāng Shǎn, the Prince of Friendship, asks Mèng Huàn, the Prince of the Night, for help investigating a mirror universe. The ponies there call it Equestria instead of Cōng Mǎ Guó, and it might have a few other differences, too...
There's a Pegasus in Equestria that looks just like Princess Celestia and she hates it. What happens when said mare goes to Princess Celestia to change her look? Will it happen or will something else come out of the meeting?
"Dear Princess Celestia, as your (former) most faithful student, I feel I have to warn you that this is probably a trap. Chrysalis cannot possibly be serious about this. Why would anyone, much less her, want to shoot a documentary on us?"