Sirius Black: He is a convicted murderer, but he isn't a murderer. He is the godfather of Harry Potter. He spent 13 years in Azkaban, the wizard jail. He escapes and is being hunted down. He is an animagus. That means he can turn into an animal. He was a friend of James Potter, Harry's father. Sirius helped make the Murador's Map.

Wormtail: He is the real murderer not Sirius. He fakes his own death. He is also an animagus. He is a Death Eater. A Death Eater is a servant of the dreaded Lord Voldemort. He has pretended to be Ron's pet rat Scabbers.

Professor Lupin: He the new Defense against the Dark Arts teacher at Hogwarts. He is a werewolf. He was friends with Harry's father at school. He helped make the Murador's Map.

Buckbeak: He is a hippogriff. He slashes Malfoy's arm and is going to be beheaded. He escapes with the help of Harry and Hermionie.