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Twenty years after the “Boy Who Lived” and his intrepid friends faced off on the silver screen against “He Who Must Not Be Named,” HBO Max will stream the highly anticipated retrospective special, Harry Potter 20th Anniversary: Return to Hogwarts, dropping at midnight on New Year’s Day. Much like the Friends reunion special that aired on the same network last year, the show will reunite the franchise’s stars Daniel Ratcliffe, Emma Watson and Rupert Grint, along other cast members like Ralph Fiennes, Robbie Coltrane, Helena Bonham Carter and Gary Oldman, to reminisce about the making of the eight movies in the Harry Potter series and revisit the film sets where it all began.