‘Mufasa: The Lion King’ cast, including Seth Rogen, Billy Eichner, Aaron Pierre, Kelvin Harrison Jr. and Tiffany Boone chat with ET’s Denny Directo about co-starring alongside Beyoncé and Blue Ivy Carter in the prequel. Lin Manuel Miranda, who wrote the soundtrack for the upcoming film, also opens up about how Beyonce set the stage for what a ‘Lion King’ soundtrack could sound like with her 2019 album ‘The Lion King: The Gift’ and how it inspired him. ‘Mufasa: The Lion King’ is in theaters on Dec. 20.