The Harry Potter series of HBO Original has cast John Lithgow as Albus Dumbledore, Janet McTeer as Minerva McGonagall, Paapa Essiedu as Severus Snape, and Nick Frost as Rubeus Hagrid. The four will serve as series regulars.

Newly announced guests or recurring cast members include Luke Thallon as Quirinus Quirrell and Paul Whitehouse as Argus Filch.

“We’re delighted to have such extraordinary talent onboard, and we can’t wait to see them bring these beloved characters to new life,” said Francesca Gardiner, showrunner and executive producer and Mark Mylod, director of multiple episodes and executive producer, in a press release.

The series is said to be a faithful adaptation of the beloved "Harry Potter" book series by author and executive producer J.K. Rowling.

It explores every corner of the Wizarding World. Each season will bring Harry Potter and its incredible adventures to new and existing audiences and will stream exclusively on Max where it’s available globally. The original, classic, and cherished films will remain at the core of the franchise and available to watch around the world.

The upcoming series is written and executive produced by Francesca Gardiner. Mark Mylod will executive produce and direct multiple episodes of the series for HBO in association with Brontë Film and TV and Warner Bros. Television. The series is executive produced by J.K. Rowling, Neil Blair, and Ruth Kenley-Letts of Brontë Film and TV, and David Heyman of Heyday Films.

The complete Harry Potter movie collection is available on Max.