Twilight Sparkle casts a spell, not knowing what it is or what it will do. And when she does cast it, it makes the Elements of Harmony change all of Ponyville. The Elements were not switched, but they switched everypony of Ponyville. Now ponies are not who they are anymore. Twilight is now a Pegasus, Rainbow is an Earth Pony, Fluttershy is a unicorn, and so on. Twilight cannot undo the spell, for she is now a pegasus, and now she has to wait for Princess Celestia to fix this whole mess. Or does she?