In the 12th installment of the X-Men series, John Brolin is cast to first appear as which character?
Josh Brolin: Josh James Brolin ( ; born February 12, 1968) is an American actor. Josh Brolin:  In April 2017, Brolin was cast as Nathan Summers / Cable as a part of a four-film contract in the "X-Men" film series, with his first appearance intended to be in "Deadpool 2". Deadpool 2: Deadpool 2 is an upcoming American superhero film based on the Marvel Comics character Deadpool, distributed by 20th Century Fox. Deadpool 2:  It is intended to be the twelfth installment in the "X-Men" film series, and a sequel to the 2016 film "Deadpool".
Nathan Summers / Cable