Let's Save Harry Potter!

Trying to get to Rio, Amy and the Doctor stumble upon the strange wizarding village of Hogsmeade, in which he meets Hermione Granger, who seems to have a piece Time Lord technology. The TARDIS gets taken by the Ministry, which sets the Doctor, Harry Potter and friends off on a journey to not only rescue the blue box, but save Harry Potter himself. Prisoner of Askaban AU.