All the news on HBO's streaming 'Harry Potter' TV series, including cast, release date, how to watch, development and whether J.K. Rowling will be involved.

The premium cabler is in talks with John Lithgow to play Albus Dumbledore, the headmaster of the Hogwarts School of Witchcraft and Wizardry. News of Lithgow’s potential involvement follows THR ‘s reporting that British actor Paapa Essiedu ( I May Destroy You) is in discussions to play Professor Severus Snape. HBO declined to comment.

Harry Potter star Jason Isaacs has revealed he knows some of the stars being cast in the new HBO series - and they’re “incredible actors”. Millions of fans worldwide are awaiting the new series, set to premiere in 2026, with casting news expected to arrive over the next few months.