Happens sometime after "Equestria Girls: Friendship Games Remake", based on the "Reflections" arc of the MLP comic, but has significant differences. Sunset Shimmer and Human Twilight and Pinkie Pie working together manage to create a trans-dimensional portal and end up travelling to another universe along with the rest of the Humane Six. In this universe, they encounter evil versions of Principal Celestia, Vice Principal Luna (both granted super-powers via stolen technology) and the Humane Six themselves. The seven heroes ally themselves with the resistance against the principals-turned-super-tyrants (resistance led by the Mirrorverse Sunset Shimmer, who never turned evil) in order to save both worlds.
Villains: Evil versions of Principal Celestia, Vice Principal Luna and the Humane Six.