After twenty changeling-free years, there is one night when Fluttershy's friends are snatched, and she needs the help of the chaotic and cranky draconequus; Discord to save Pinkie, Spike, Rarity, SassaFrass, fluffy clouds and his doll, D.J Pon three, Radiant Hope, and Blueblood, before their powers are stolen from the changelings, and die.

(A lot like the movie trolls)