Image Credit: WireImage The new HBO Harry Potter TV series is set for a December 2026 release. Featuring a brand-new cast, the show is a fresh take on the Wizarding World created by J.K. Rowling, and the cast has made headlines since they began production. Now that a trailer has been unveiled, many are wondering where "he who must not be named" is. More importantly, perhaps, fans are wondering who was cast to play Voldemort. Hollywood Life has the latest updates on the casting choice of HBO's new Voldemort here.