Harry Potter and the Prisoner of Azkaban

It's Harry's third year at Hogwarts; not only does he have a new "Defense Against the Dark Arts" teacher, but there is also trouble brewing. Convicted murderer Sirius Black has escaped the Wizards' Prison and is coming after Harry.
(IMDB)

My favorite movie of the whole series It was really exciting seeing the time turning and how Lupin and Sirius explains everything