‘Mufasa: The Lion King’ director Barry Jenkins, Lin-Manuel Miranda, who wrote music for the film, and cast members Kelvin Harrison Jr., Anika Noni Rose and Aaron Pierre chat with ET’s Nischelle Turner at Disney’s D23 Expo about the film, which hits theaters on Dec. 20. Barry opens up about Blue Ivy Carter’s ‘wonderful’ acting debut as Kiara in the movie after her mom, Beyoncé, voiced Nala in 2019’s ‘The Lion King.’ Lin-Manuel shares what it was like to create music for Mufasa’s origin story. Plus, Anika and the cast react to releasing the film 30 years after the original animated version.