HBO's 'Harry Potter' TV show announced some of its brand new cast. Here's everything we know about the upcoming series.

Daniel Radcliffe as Harry Potter in "Harry Potter and the Deathly Hallows: Part 2."

Warner Bros.

• Warner Bros. Television is working on a scripted "Harry Potter" TV show for HBO. 
• The cast includes John Lithgow as Albus Dumbledore, the headmaster of Hogwarts.
• The show is eyeing a release in 2026 and will remain "faithful" to the book series.

A "Harry Potter" TV show is in the works.

Warner Bros. Discovery first confirmed its plans to expand the wizarding...