Kit Harington and Keira Knightley join Harry Potter audiobook cast Harry Potter: The Full-Cast Audio Editions has announced more stars lending their voices to the audiobooks, including Kit Harington, Keira Knightley and James McAvoy. 10 September 2025 Kit Harington and Keira Knightley have been cast in the new Harry Potter audiobook series. Keira Knightley has joined the cast of the new Harry Potter audiobooks The Game of Thrones actor and Black Doves actress are among the 10 new stars lending their voices to the Harry Potter: The Full-Cast Audio Editions.