After Maud is injured on the Rock Family rock farm, Pinkie's latent divine powers, augmented by what she accidentally absorbs from Maud, reawaken the goddess that created Equestria. This goddess is not pleased with the world she sees and goes on a destructive rampage to 'cleanse this world.' It's up to Twilight and the others to stop goddess-Pinkie before everyone and everything they know and love is lost forever.