TV Worth Binging in the New Year

ET’s Lauren Zima has all the details on the ‘Harry Potter 20th Anniversary: Return to Hogwarts’ reunion special with Daniel Radcliffe, Emma Watson and Rupert Grint. Meanwhile, ET’s Leanne Aguilera speaks with the cast of the Netflix hit ‘Cobra Kai’ as they prepare for the premiere of season 4. Plus, an exclusive sneak peek of the finale of TV’s most-watched show, ‘Yellowstone.’