Harry Potter is being rebooted as a TV show for HBO, and one Harry Potter star has a strong opinion on that. With the Harry Potter TV show expected to come out in 2027, anticipation continues to build for Hollywood’s ambitious new take on J.K. Rowling’s global phenomenon. Launched in 1997 with Harry Potter and the Philosopher’s Stone, the Harry Potter book series defined millennial life for many and went on to form the basis of the legendary Warner Bros. movies.