Here's everything to know about HBO's 'Harry Potter' series, which may have recently cast its new Dumbledore After seven books, eight movies, one play and a whole spin-off series, Harry Potter is debuting on the small screen for the first time.

When asked about the offer to play Dumbledore, Lithgow described the decision as "not easy," recognizing it could define the final phase of his illustrious career.

John Lithgow attends The Old Man" Season 1 NYC Tastemaker Event at ... [+] MOMA on June 14, 2022 in New York City. (Photo by Jamie McCarthy/) The first confirmed actor in the upcoming Harry Potter live-action TV series is John Lithgow who will be playing Hogwarts headmaster and wizard legend,