Harry Potter and the Prisoner of Azkaban attacked by a big black dog, which Harry has seen several times before. The dog drags Ron through a tunnel under the Whomping Willow into the Shrieking Shack. Harry and Hermione follow, and there is a brief standoff when they find Ron with Sirius Black, who has transformed from the dog. Lupin enters, and they explain the situation to Harry and his friends: Lupin is a werewolf, which led to his friends James Potter, Sirius Black, and Peter Pettigrew becoming animagi. Lupin explains that Scabbers is Pettigrew in his animal form; he has been hiding from Black, whom he had
Harry Potter and the Prisoner of Azkaban (film) intending to kill him. The film stars Daniel Radcliffe as Harry Potter, alongside Rupert Grint and Emma Watson as Harry's best friends Ron Weasley and Hermione Granger. It also features well-known actors in supporting roles, including Gary Oldman as Sirius Black, David Thewlis as Remus Lupin, Michael Gambon (in his debut in the role of Albus Dumbledore), Emma Thompson as Sybill Trelawney and Timothy Spall as Peter Pettigrew. It is the sequel to "Harry Potter and the Chamber of Secrets" and is followed by "Harry Potter and the Goblet of Fire". The film was released on 31 May 2004 in