In Harry Potter and the Prisoner of Azkaban, Harry (Daniel Radcliffe) and his friends Ron (Rupert Grint) and Hermione (Emma Watson) return for their third year at Hogwarts School of Witchcraft and Wizardry, where the teenagers are forced to face their darkest fears as they confront a dangerous escaped prisoner (Gary Oldman) and the equally foreboding Dementors, who are sent there to protect them.