Humans from another world have been appearing in Ponyville. Calling themselves the Displaced, they each had taken on the form and abilities of a fictional character when they arrived. At first, this development greatly excited Twilight Sparkle. Now, two years later, she's at her wit's end. There were just so many of them she needed to deal with popping up almost every week. Then, she had an epiphany. Why not cut them off at the source? And so unfolds her master plan, known as Operation: Replace. But can five Displaced - and one pony - really take down the Merchant?