.“Other “Harry Potter” cast members featured in the special include Helena Bonham Carter, Robbie Coltrane, Ralph Fiennes, Jason Isaacs, Gary Oldman, Tom Felton, James Phelps, Oliver Phelps, Mark Williams, Bonnie Wright, Alfred Enoch, Ian Hart, Toby Jones, Matthew Lewis, Evanna Lynch, producer David Heyman and filmmakers Chris Columbus, Alfonso Cuarón, Mike Newell and David Yates.“Harry Potter 20th Anniversary: Return to Hogwarts” is executive produced by Casey Patterson of Casey Patterson Entertainment (“A West Wing Special to Benefit When We All Vote”) and Pulse Films (“Beastie Boys Story”).The special is produced by Warner Bros.
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