The worlds of magic, demigods and Narnians are all at stake as Lord Voldemort, Kronos and the White Witch have all joined forces and used their combined powers to merge Hogwarts, Camp Half-Blood and Narnia all together. It’s up to Harry, Ron, Hermione, Percy, Grover, Annabeth, Peter, Susan, Edmund, Lucy, Eustace, Caspian and you to save the three worlds.