A strange artifact arrives at Twilight's library and turns her into a dragon. From there, everypony she touches suffers a similar fate and the race is on to find a cure before all of Equestria falls prey!
Pinkie Pie finds herself in a position where she can no longer recall the years she has spent in Ponyville, as if the memories were erased from her mind entirely. She must rediscover herself, her love for her friends, and her passion for life.