After an accident involving one of Starswirl's objects, Luna gets turned into a stallion. She'll have to contend with judging nobles, romantic mares, paparazzi, and her obnoxious sister in order to find a way to turn her back.
A human soul is stuffed into King Sombra's body. Having no idea what's going on, and thinking he is in some kind of coma, he just casually strolls into the Crystal Empire.