The Harry Potter TV show's new castings come to life in a new fan-made video. HBO's new take on J. K. Rowling's beloved source material took a major step forward earlier this month when it was announced that six actors had been cast as various members of Hogwarts' staff. Though the three main roles of Harry, Ron, and Hermione have not yet been announced, the Harry Potter TV show is now confirmed to include John Lithgow as Dumbledore, Paapa Essiedu as Snape, Janet McTeer as McGonagall, Nick Frost as Hagrid, Luke Thallon as Professor Quirrell, and Paul Whitehouse as Filch.