Pinkie Pie goes to bed one night after an average day in Ponyville only to wake up in a strange world as a creature she had never seen before. Now other creatures of this world claim that she is one of them who disappeared fifteen years ago.
Now as she sleeps in the new world she awakens in Ponyville and as she sleeps in Ponyville she awakens in the new world. With both sides saying they're real and the other isn't she must decide what is reality and what is just a delusion.