One detail about HBO’s Harry Potter series keeps standing out — and it’s not the new cast.
Warwick Davis is returning as Professor Filius Flitwick, a role he first played in Harry Potter and the Philosopher’s Stone (2001). In a project that’s been positioned as a clean start, that kind of carryover immediately raises questions about how separate this version really is.
Adding to that is a past comment from Ralph Fiennes, who recently said he had been asked whether he’d consider returning as Lord Voldemort, a role he played from Harry Potter and the Goblet of Fire (2005) through Harry Potter and the Deathly Hallows – Part 2 (2011). There’s no indication that conversation was tied to the HBO series, and it likely predates its development, but it still feeds into a broader pattern.
Because once you have even one returning actor, it shifts the conversation. Instead of a clean reboot, the series starts to look like something that could sit alongside the films rather than replace them.
That’s where the idea of a Wizarding World Multiverse might come in. Nothing official points in that direction, but the logic is easy to follow. Between Time-Turners and established magical rules, there’s already a built-in way to explain multiple versions of the same world coexisting.
For now, the HBO series remains a straight adaptation of the novels. But with legacy casting already in play, it’s not surprising that fans might start to look at it differently.
So far, Davis is the only confirmed returning actor from the original films. Everyone else is new, including the central trio: Dominic McLaughlin (Harry Potter), Arabella Stanton (Hermione Granger), and Alastair Stout (Ron Weasley). Around them is a large supporting cast: John Lithgow (Albus Dumbledore), Janet McTeer (Minerva McGonagall), Nick Frost (Rubeus Hagrid), Bel Powley (Petunia Dursley), Paul Whitehouse (Argus Filch), Lox Pratt (Draco Malfoy), Katherine Parkinson (Molly Weasley), and Paapa Essiedu (Severus Snape).
The series itself is already well into its rollout. The first official trailer for the series has been released, the Finding Harry behind-the-scenes featurette has offered an early look at production, and a premiere date has been set for Christmas Day, December 25, 2026.
It hasn’t all been smooth-sailing, though. Essiedu’s casting as Snape has sparked backlash from some corners of the fanbase. The actor has reportedly faced online abuse, including death threats. The show also remains tied to ongoing controversy surrounding J. K. Rowling herself, while separate reports have even pointed to issues behind the scenes.
Harry Potter and the Philosopher’s Stone
HBO’s Harry Potter is written and executive-produced by showrunner Francesca Gardiner (HBO’s Succession, His Dark Materials, Killing Eve). J. K. Rowling, Neil Blair, and Ruth Kenley-Letts of Brontë Film and TV, and David Heyman of Heyday Films are also onboard as executive producers. Mark Mylod (Succession, Game of Thrones, The Last of Us) will executive-produce and direct multiple episodes.
Harry Potter and the Philosopher’s Stone premieres on December 25, 2026.
