The first picture of Gary Oldman as 'Sirius Black' online! A shot of the cast of Harry Potter and the Prisoner of Azkaban! Brian B. — July 23, 2003 Facebook Twitter Reddit Email Comment Harry Potter and the Prisoner of Azkaban:Coming Soon! got a photo of the cast of the 3rd Harry Potter film from DigiCasey.com which shows Gary Oldman in costume as 'Sirius Black'! CLICK HERE to take a look!