Donald Glover & James Earl Jones Cast As Simba And Mufasa In New 'Lion King' Movie. Bossip previously reported that there is a live-action version of the Disney classic The Lion King coming to theaters. What we can now report is that both Simba and Mufasa have been cast and we couldn’t be happier at the choices. According to director Jon Favreau Simba will be played by… Simba’s father, Mufasa, will rightly be played by the incomparable… We must admit, we did lie a lil’ bit. We said were happy for Donald Glover, and we are, but the question is, how does this affect the production of season 2 of "Atlanta"???? We NEEDS that.