Discord smiled in glee as he rubbed his paw and claw together. He was very excited to grant Trixie's wish: hoping Rainbow and Scootaloo would stay out of her way! A flick of his claw. A chaotic smile. Trixie's gasp of horror. What had happened? Rainbow Dash and Scootaloo had switched ages! Now it is up to Trixie to unravel the spell by doing what Discord says-going through his mysterious Chaos Castle, full of adventure and secrets, with some help from the pegasi, and her least favorite earth pony, Pinkie Pie. Is a friendship in crisis? Right.