HBO’s Harry Potter is slowly starting to ramp up the excitement factor, with several casting decisions being revealed. John Lithgow is the only actor officially in the Harry Potter television show, as Albus Dumbledore, but numerous other actors are rumored to join this spellbinding world. Nick Frost has been linked with Rubeus Hagrid, Janet McTeer is expected to be Minerva McGonagall, and Paapa Eddiedu is HBO’s first choice for Severus Snape.