Harry Potter (film series) to be re-cast for the third instalment, "Harry Potter and the Prisoner of Azkaban". David Heyman and director Alfonso Cuarón chose Michael Gambon to portray the character of Dumbledore, which he did for all succeeding films. Notable recurring cast members include Helena Bonham Carter as Bellatrix Lestrange, Warwick Davis as Filius Flitwick, Ralph Fiennes as Lord Voldemort, Brendan Gleeson as Alastor Moody, Richard Griffiths as Vernon Dursley, Jason Isaacs as Lucius Malfoy, Gary Oldman as Sirius Black, Fiona Shaw as Petunia Dursley, Timothy Spall as Peter Pettigrew, David Thewlis as Remus Lupin, Emma Thompson as Sybill Trelawney, Mark Williams as
Harry Potter and the Philosopher's Stone (film) they had auditioned "worthy". On 8 August 2000, the virtually unknown Daniel Radcliffe and newcomers Rupert Grint and Emma Watson were selected to play Harry Potter, Ron Weasley and Hermione Granger, respectively. In 1997, producer David Heyman searched for a children's book that could be adapted into a well-received film. He had planned to produce Diana Wynne Jones' novel "The Ogre Downstairs", but his plans fell through. His staff at Heyday Films then suggested "Harry Potter and the Philosopher's Stone", which his assistant believed was "a cool idea." Heyman pitched the idea to Warner Bros. and in 1999, Rowling sold