As soon as Isaiah Mustafa knew he was auditioning for a role in “It: Chapter Two,” in theaters now, he looked to the performance of Springfield … It Chapter Two hits theaters this weekend, and Pennywise returns to haunt the poor members of the Losers’ Club decades later. An Old Spice spokesman has joined the cast of It: Chapter 2, as Isaiah Mustafa will join Jessica Chastain, James McAvoy and Bill Hader in the highly-anticipated sequel.. We had the chance to chat with Isaiah Mustafa, The It Chapter 2 cast has finally been rounded out with the addition of Old Spice spokesman Isaiah Mustafa as the adult version of Mike Hanlon. 5. Who will play adult Mike in 'IT: Chapter 2'? We had the chance to chat with Isaiah Mustafa… It Chapter Two hits theaters this weekend, and Pennywise returns to haunt the poor members of the Losers’ Club decades later. Isaiah Mustafa has joined the cast of It: Chapter 2 as the adult version of Mike Hanlon in the second half of the Stephen King adaptation. Mike was played by Chosen Jacobs in 2017's 'IT' and will be portrayed by Isaiah Mustafa in the sequel.