HBO's 'Harry Potter' TV show recasts all of the Hogwarts characters with new actors. See who's who in this cast guide.

Casting for six major characters in HBO's upcoming 'Harry Potter' series, including Dumbledore, Snape and Hagrid have been announced.

The actor is the only star so far that has a previous tie to the Harry Potter films, as he was previously cast as Sir Cadogan, a knight in one of Hogwart’s paintings, in the Prisoner of Azkaban.

John Lithgow was cast as Dumbledore in HBO's upcoming "Harry Potter" TV series, alongside Janet McTeer, Paapa Essiedu, and Nick Frost in major roles. Key roles still uncast, include Harry ...