(ALERT: Diapers, regression, and related. Do not click if you are not into this.) Ponies who visit a strange but kind pegasus's home vanish, and put into a game. Losers are slowly turned into foals. The SIU is sent to investigate the vanished.
A kidnapper is afoot in the city of Maretropolis, over 300,000 ponies have been stolen in the night. It's up to the Power Ponies to bring justice to the villain.
Sunset Shimmer returns to Equestria determined to save her home, but at such cost that destruction might be preferable. With Twilight imprisoned in the Labyrinth Box and the Mane Six captured the hopes of Equestria rest with the CMC.