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,

Frost and Essiedu have been cast as half-giant Hogwarts groundskeeper Rubeus Hagrid and potions professor Professor Severus Snape, respectively, in HBO's ambitious Harry Potter series. HBO executives also announced two guest/recurring cast members on Monday: Luke Thallon as teacher Quirinus Quirrell and comedian Paul Whitehouse as caretaker