O’Shea Jackson Jr. joins in Warner Bros’ legal drama film Just Mercy According to The Hollywood Reporter, O’Shea Jackson Jr. is joining the cast of Warner Bros. Pictures’ legal drama Just Mercy. He joins a cast that includes Michael B. Jordan (Black Panther, Creed II) , Academy Award winner Brie Larson (Room, Captain Marvel) and Golden Globe winner Jamie Foxx (Ray, Django Unchained, Baby Driver). RELATED: Brie Larson Joins Michael B.