HBO is preparing to put one of Hollywood’s most recognizable franchises back through the sorting hat.
Its new Harry Potter television series premieres December 25, 2026, beginning another adaptation of J.K. Rowling’s seven novels more than two decades after Daniel Radcliffe first appeared as the young wizard.
This time, Dominic McLaughlin plays Harry Potter, with Arabella Stanton as Hermione Granger and Alastair Stout as Ron Weasley.
The supporting cast includes John Lithgow as Albus Dumbledore, Janet McTeer as Minerva McGonagall, Paapa Essiedu as Severus Snape, and Nick Frost as Rubeus Hagrid.
Unlike the Warner Bros. movies, however, HBO has considerably more time to tell Harry’s story.
Each book is being adapted for television rather than condensed into a single feature film, opening the door for characters, relationships, and storylines that previously disappeared during the move from page to screen.
That difference has now won over one particularly notable member of the original Harry Potter cast.
Gary Oldman Weighs In on HBO’s Harry Potter Series
Gary Oldman, who played Sirius Black in the original movies, believes HBO’s adaptation could prove more satisfying than the films.
Speaking to Entertainment Weekly, Oldman said the biggest advantage is simply the amount of material the television series can retain.
“We had to cut a lot, and still we could only get the films down to, like, three hours,” he said.
The problem became increasingly difficult as Rowling’s books expanded.
Harry Potter and the Order of the Phoenix, for example, runs hundreds of pages longer than the earliest installments but ultimately became one of the shorter movies in the franchise.
Oldman believes the HBO format could avoid those compromises.
“I believe [the TV series is] gonna do it pretty much word-for-word, which I think, as a viewer, would be more satisfying,” he said.
The actor also acknowledged that “a lot of character detail was sacrificed” while adapting the novels for theaters.
That does not necessarily mean HBO will literally reproduce every line of Rowling’s books.
But the company has repeatedly promoted the new series as a more extensive adaptation, with material omitted from the films already expected to return.
One example is Peeves, the Hogwarts poltergeist who appears throughout the books but was completely removed from the finished movie series.
The first season will also have more room to explore Harry’s life before Hogwarts, along with smaller moments from Harry Potter and the Philosopher’s Stone that the 2001 film moved through more quickly.
Why Sirius Black Could Benefit From a Longer Adaptation
Oldman’s comments are particularly interesting considering how much of Sirius Black’s story was simplified onscreen.
Sirius first becomes central to the story in Harry Potter and the Prisoner of Azkaban, where Harry initially believes he escaped Azkaban to murder him.
Sirius was James Potter’s closest friend and Harry’s godfather, but his characterization becomes far darker and more troubled in the later books than the films had time to explore.
During Order of the Phoenix, Sirius is forced to remain inside his childhood home at 12 Grimmauld Place while other members of the Order continue working against Lord Voldemort.
The books show Sirius becoming increasingly frustrated, reckless, and bitter, while his interactions with Harry sometimes suggest he struggles to separate his godson from James.
At one point, Sirius is disappointed when Harry refuses to take the kind of risk he believes James would have embraced.
The movies soften much of that tension, presenting Sirius more consistently as Harry’s supportive father figure.
Other parts of his history were also heavily condensed.
The novels spend more time on Sirius rejecting the Black family’s obsession with blood purity, leaving home as a teenager, and developing a hostile relationship with relatives who supported Voldemort’s ideology.
His younger brother Regulus also becomes more important to the wider story.
Sirius is not the only character fans have argued could benefit from HBO’s slower approach.
Ron Weasley lost several significant moments to Hermione in the films, while Ginny Weasley’s personality and relationship with Harry were both much more developed in the books.
HBO already has another season in development.
Season two will adapt Harry Potter and the Chamber of Secrets, with Kit Harington joining as Gilderoy Lockhart, Lenny Rush playing Dobby, and Billy Barratt appearing as young Tom Riddle.
Sirius himself will not become a major concern until the third adaptation, Prisoner of Azkaban. HBO has not announced who will inherit the role from Oldman.
Do you think HBO’s Harry Potter series will improve on the original movies?
