Gary Oldman believes HBO’s upcoming Harry Potter television series could ultimately be more satisfying for longtime fans than the original movies. Oldman, who portrayed Sirius Black across four films in the Wizarding World franchise, explained that the biggest advantage of the new adaptation is its ability to preserve substantially more material from J.K. Rowling’s books.
The actor’s comments come as HBO prepares to bring the story back to television with a new cast. Unlike the original film series, which had to compress thousands of pages of source material into feature-length movies, the HBO production will have multiple seasons to explore the books in greater detail.
For Oldman, that could make a significant difference to characters such as Sirius, whose role was considerably reduced in the films. The actor previously expressed disappointment that the character did not receive enough screen time, making his latest comments particularly relevant to fans wondering how faithfully the new series will adapt the books.
Gary Oldman Thinks HBO Can Restore Lost Harry Potter Details
Speaking to Entertainment Weekly, Oldman explained why he expects the HBO series to offer a more complete adaptation than the movies.
“We had to cut a lot [for the ‘Harry Potter’ movies], and still we could only get the films down to, like, three hours,”
he said.
Oldman added that the process of shortening the stories meant
“a lot of character detail was sacrificed.”
He believes HBO’s longer format can address that problem by staying much closer to Rowling’s original writing, saying,
“I believe [the HBO series is] gonna do it pretty much word-for-word, which I think, as a viewer, would be more satisfying.”
The difference in format is important because several major elements from the books had to be shortened or removed when adapted for cinema. Sirius Black is one example, as Oldman’s character had considerably more importance in the source material than his screen appearances sometimes suggested.
Oldman previously told IndieWire that Sirius “wasn’t in it enough,” pointing specifically to how quickly the character’s story ended after appearing throughout the later books. His comments have since become part of the broader discussion about which characters could benefit most from HBO’s expanded adaptation.
HBO’s Harry Potter Series Is Building a New Cast
The upcoming series will introduce a new generation of actors to Hogwarts, with Dominic McLaughlin playing Harry Potter, Arabella Stanton as Hermione Granger and Alastair Stout as Ron Weasley. John Lithgow will portray Albus Dumbledore, while Janet McTeer plays Minerva McGonagall, Paapa Essiedu takes on Severus Snape and Nick Frost portrays Rubeus Hagrid.
Season 1 has completed production and is scheduled to premiere on HBO and HBO Max on December 25, 2026. The second season, based on Harry Potter and the Chamber of Secrets, is already in pre-production at Leavesden Studios near London.
HBO has yet to announce who will play Sirius Black in the new series. That casting decision could become particularly important if the adaptation follows Oldman’s preferred approach and gives the character more of the depth and screen time he received in the books.
Despite his criticism of certain aspects of the original movies, Oldman remains appreciative of his time in the franchise. He has described himself as “proud” and “grateful” to have been part of the phenomenon, while praising director Chris Columbus and the original ensemble for establishing a world that audiences continued returning to.
The new Harry Potter series therefore has an opportunity to revisit familiar stories while expanding moments and characters that the movies had to condense. For Oldman, that greater access to the source material could ultimately make HBO’s version a more complete experience for viewers.
