this story is about the mane six and their enemy discords brother, upcord. He casts a spell that changes the Pony's into their true selves. It all makes sense in my opinion because Twilight wouldn't be a princess without the other five. (harmonys) So they all don't remember anything. they have just always after twilight disappeared that they all became Alocorns. Will they get there memory back and save the world from upcord? or will they never remember their memories?