Principal Abacus Cinch is preparing to deal with the aftermath of the Friendship Games as she receives an invitation to Equestria from someone very familiar.
Telling Flash Sentry to get over Princess Twilight Sparkle was just the first step. Now Sunset Shimmer must make sure that the two part on good terms and remain friends.
Principal Cinch wants to stop the pervasive mystical energies of another dimension from spreading. She might even have to get the sirens involved to achieve that.