From John Lithgow to Nick Frost, there are a number of actors confirmed or rumoured to appear in HBO's upcoming TV adaptation of JK Rowling's books.

The Harry Potter TV series has found its Hagrid in Nick Frost, one of the stars of Shawn of the Dead, Spaced, and more.

Lithgow, who said he's already getting stopped at airports by excited Potter fans, also shared that he's currently in the process of reading the novels in which the movies and upcoming series is based by J.K. Rowling to prepare for the role. "I seem to be behind everybody," he said. "I'm halfway through the second of these seven novels."