A Harry Potter reunion is just what the doctor ordered to usher in a New Year we hope will be better than the last. Featuring Daniel Radcliffe, Rupert Grint, and Emma Watson—plus Helena Bonham Carter, Robbie Coltrane, Ralph Fiennes, and most everyone else who made the Harry Potter movies such classics—the special marks the 20th anniversary of the eight-film series. Consider it the perfect excuse to embark on a full Harry Potter marathon, starting with 2001’s Harry Potter and the Sorcerer’s Stone, when the octave of Harry and Ron’s voices perfectly matched Hermione’s. —J.V.