Bookworm has been alone his whole life, and he is happy with it. But when a series of fortunate events make him the love interest of a very special mare, Book learns that love is now something he can't do without.

When Rainbow Dash finds Nightmare Moon's helmet, she becomes possessed by anger, hatred, and jealousy, she becomes the new Nightmare Moon, and wreaks havoc over Ponyville. Can her friends stop her, or will Rainbow be beaten by the ultimate enemy, herself?