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the quidditch match
During the quidditch match, Harry collides with a Dementor causing him to faint and fall off his broomstick. His Limbus 2000 falls to the ground and is smashed to pieces. Harry is brutally injured and is imminently transported to the nursery. Afterward, Professor Lupin teaches Harry to defend himself against the Dementors. -
The haunted house
Scabbers escapes from Ron, and Ron runs after him. The large black dog that has stalked Harry throughout the semester, appears and attacks Ron, then drags him into a tunnel under the Whomping Willow. Crookshanks, Harry, and Hermione follow them through the tunnel and to the Shrieking Shack, a haunted house in Hogsmeade. They discover that the dog is Sirius Black in animal form. Harry disarms Black and intends to kill him but finds he cannot. -
The Hogsmeade
Harry uses the Marauders map to sneak into the magical village Hogsmeade. Harry overhears some of his teachers and learns Black was a friend of Harry's parents and was entrusted with the secret of their whereabouts when they hid from Voldemort. However, he betrayed the Potters, leading to their murder by Voldemort's. In the end, Black killed 12 muggles and his former friend Peter Pettigrew, before captured and taken to Azkaban. -
End of summer break
Harry is back at Dursley's house for the summer and as every year he celebrates his birthday alone in his room. Mr. and Ms. Dursley are very harsh on Harry and he doesn't like staying there. Harry sees on television that a convict named Sirius Black has escaped from the prison Azkaban. After a conflict with Ms. Dursley, he accidentally inflates her and runs away from home. -
Leaving for school
On the way to Hogwarts, a Dementor boards the train and attacks Harry. He is forced to revile his parents before fainting. The new defense against the dark art teacher Remis Lupin saves Harry and his friends for the Dementor. They learn Dementors will roam around the school in the search for the convict Serius Black. -
The time travel
Harry and Hermione return to the nursery to close the timeline. Enraged by the escape of Black, Snape lets slip that Lupin is a werewolf, forcing him to resign. Harry returns to Kings Cross with his friends and receives a letter from Black, whom the Potters made Harry's godfather, giving him permission to visit Hogsmeade next year. -
Harry saves Pittigrew
Snape, who still holds a childhood grudge against Lupin and his friends, arrives to apprehend Black but is knocked unconscious by Harry, Ron, and Hermione, who believe Black to be innocent. Lupin and Black transform Pettigrew into human form and prepare to kill him, but Harry stops them because he feels his father would not have wanted it. He convinces Lupin and Black to send Pettigrew to Azkaban instead. -
The hippogryph
Hagrid's hippogriff Buckbeak is in danger of being executed by the Ministry of Magic after injuring Draco Malfoy, who provoked Buckbeak. Despite Hermione's and Ron's efforts to defend the hippogriff, they and Harry seemingly hear Buckbeak executed as they leave Hagrid's hut. While visiting Hagrid's, however, Hermione discovers Scabbers hiding the -
The time-turner
Later in the nursery, Harry and Hermione are told that Black has been sentenced to have his soul sucked out by Dementors. Professor Dumbledore tells Harry and Hermione to use Hermione's time-turner, a device she has been using to attend simultaneous classes, to go back in time and save Buckbeak and Sirius. They rescue Buckbeak from execution. Harry and Hermione ride Buckbeak to the tower where Black is being held and break him out. Black escapes on Buckbeak.