Directed by David Yates.
Harry's fifth year begins with him being attacked by Dementors in Little Whinging. Later, he finds out that the Ministry of Magic is in denial of Lord Voldemort's return. Harry is also beset by disturbing and realistic nightmares while Professor Umbridge, a representative of Minister for Magic Cornelius Fudge, is the new Defence Against the Dark Arts teacher. Therefore the rebellion involving the students of Hogwarts, secret organisation Order of the Phoenix, the Ministry of Magic and the Death Eaters begins.
thank you wikipedia