For both of these characters, the studio is looking for young actors to play the characters between the ages of 8 and 13.

The studio is currently casting for actors to play the roles of young Scar and Mufasa.

Via Charlie Quigg, here's a DisInsider article that purports to have some insight into a few of the new characters that will be filling out the cast along with young Mufasa and Scar: But the Reddit post linked above has a lot more bits and pieces cobbled together to summarize what we know so far. That quote is from a linked article on Kelvin Harrison, slated to play the younger Scar. I love the villains - Maleficent, Scar, Jafar - they’re so much more fun to play. They’re cool but someone else can do that. The secrecy surrounding the project is so tight that he can’t yet shed any light on Jenkins’ vision for the Pride Lands, but the original, which “came out the year I was born,” was a big part of his childhood, and he’s excited to become “a Disney villain - technically a prince… I’m not a fan of heroes. Last summer, the studio confirmed that Harrison will voice a younger version of Scar, Mufasa’s nefarious brother, in a new Lion King film, directed by Oscar winner Barry Jenkins.

'Then there’s the small matter of a certain Disney prequel. A Reddit post purports to show leaked information that director Barry Jenkins has some concrete plans for the upcoming followup to the 2019 CGI TLK remake:

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