Discord has teamed up with Starlight Glimmer, Trixie, and Thorax to save their friends - particularly Fluttershy - when they are captured by changelings. Discord's magic has been disabled in the Changeling Kingdom due to the properties of Queen Chrysalis' throne, forcing him to navigate the castle without teleporting. While in the castle, Discord has frequent arguments with Trixie because of their clashing personalities. But who, and what will they meet while in this story?