Max's Harry Potter TV series has officially cast four series regulars and two recurring roles, including four actors Deadline previously revealed: John Lithgow as Albus Dumbledore, Janet McTeer as Minerva McGonagall,

Lithgow confirmed his own casting in February and will join McTeer, Frost, Paapa Essiedu, Paul Whitehouse, and more in the franchise's first TV adaptation.

Several famous faces will be heading to Hogwarts in HBO’s upcoming Harry Potter TV show. Nearly two years after the series was first announced, John Lithgow confirmed the rumor that he would portray Albus Dumbledore in the small-screen adaptation of J.