The Harry Potter HBO show is in its early stages, and only now seems to be on the verge of starting to get its cast together.

Mark Rylance is at the top of the casting wishlist for the new HBO "Harry Potter" adaptation, Variety has learned from sources familiar with the project. Rylance, who is starring as Thomas Cromwell in the highly-anticipated BBC period drama "Wolf Hall: The Mirror and The Light" (based on Hilary Mantel's novel),

HBO is reportedly setting its sights on an iconic actor to play Dumbledore in the Harry Potter TV series, and it might be the perfect choice.