Harry Potter and the Prisoner of Azkaban is a 2004 fantasy film directed by Alfonso Cuarón and distributed by Warner Bros. Pictures. It is based on J. K. Rowling’s 1999 novel of the same name. The film, which is the third instalment in the Harry Potter film series, was written by Steve Kloves and produced by Chris Columbus (director of the first two instalments), David Heyman, and Mark Radcliffe. The story follows Harry Potter’s third year at Hogwarts as he is informed that a prisoner named Sirius Black has escaped from Azkaban intending to kill him.
Harry Potter has been spending another dissatisfying summer with The Dursleys. When Harry’s Aunt Marge insults his parents, he loses his temper and silently wills her to bloat up and float away. Fed up, Harry then flees the Dursleys with his luggage. The Knight Bus delivers Harry to the Leaky Cauldron, where he is pardoned by Minister of Magic Cornelius Fudge for using magic outside of Hogwarts. After reuniting with his best friends Ron Weasley and Hermione Granger, Harry learns that Sirius Black, a convicted supporter of the dark wizard Lord Voldemort, has escaped Azkaban prison and intends to kill Harry.
The trio return to Hogwarts for the school year on the Hogwarts Express, only for dementors to suddenly board the train, searching for Sirius. One enters the trio’s compartment, causing Harry to pass out, but new Defence Against the Dark Arts teacher Professor Lupin repels the dementor with a Patronus Charm. At Hogwarts, headmaster Albus Dumbledore announces that dementors will be guarding the school while Sirius is at large. Hogwarts groundskeeper Rubeus Hagrid is announced as the new Care of Magical Creatures teacher; his first class goes awry when Draco Malfoy deliberately provokes the hippogriff Buckbeak, who attacks him. Draco exaggerates his injury, and his father Lucius Malfoy later has Buckbeak sentenced to death.
The Fat Lady’s portrait, which guards the Gryffindor quarters, is found ruined and empty. Terrified and hiding in another painting, she tells Dumbledore that Sirius has entered the castle. During a stormy Quidditch match against Hufflepuff, dementors attack Harry, causing him to fall off his broomstick. At Hogsmeade, Harry is shocked to learn that not only had Sirius been his father’s best friend and apparently betrayed them to Voldemort, but is also Harry’s godfather. Lupin privately teaches Harry to defend himself against dementors, using the Patronus Charm.