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.
After learning about their human counterparts in the world beyond the mirror, Cadance and Shining Armor begin to wonder about the pony counterpart of Abacus Cinch.
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.