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.

John Lithgow and Paapa Essiedu will portray Albus Dumbledore and Severus Snape in the upcoming "Harry Potter" series from HBO, Warner Bros. announced alongside other cast members Monday.

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,