Question: In the 12th installment of the X-Men series, John Brolin is cast to first appear as which character?

Context articles: Ch'od
X-Men: Days of Future Past
List of Waterloo Road characters (series 4)
Deadpool 2
X2 (film)
List of Waterloo Road characters (series 9)
Raza Longknife
Midnight Phantom (TV series)
Mercury (Marvel Comics)
Josh Brolin

Ch'od is a fictional character appearing in American comic books published by Marvel Comics.
 The character is usually seen in the X-Men series and various spin-offs.
X-Men: Days of Future Past is a 2014 American superhero film based on the fictional X-Men characters that appear in Marvel Comics.
 Directed by Bryan Singer, it is the seventh installment of the "X-Men" film series and acts as a sequel to both 2006's "" and 2011's "".
 The story, inspired by the 1981 "Uncanny X-Men" storyline "Days of Future Past" by Chris Claremont and John Byrne, focuses on two time periods, with Wolverine traveling back in time to 1973 to change history and prevent an event that results in doom for both humans and mutants.
 The film features an ensemble cast, including Hugh Jackman, James McAvoy, Michael Fassbender, Jennifer Lawrence, Halle Berry, Anna Paquin, Ellen Page, Peter Dinklage, Ian McKellen and Patrick Stewart.
 Simon Kinberg wrote the screenplay from a story conceived by Jane Goldman, himself, and Matthew Vaughn.
The following is a list of characters who first appear in the fourth series of the BBC school drama "Waterloo Road", in order of first appearance.
 The fourth series consists of twenty episodes, first broadcast from 17 January to 20 May 2009.
 The main cast remains mostly unchanged from series 3, augmented by Rob Cleaver in the first ten episodes and returning character Kim Campbell from episode eleven.
 The Kelly family, consisting of mother Rose and her children Marley, Earl, Sambuca and Denzil, all first appear in episode 1.
 Head Girl Flick Mellor and her father Ralph, head of the board of governors and local police chief, also debut in episode 1, as does head of extended services, and sister to head teacher Rachel Mason, Melissa Ryan.
 Melissa's son Phillip and security guard Dave Miller first appear in episode two, and pupil Lauren Fletcher (later Lauren Andrews) makes her first appearance in episode six.
Deadpool 2 is an upcoming American superhero film based on the Marvel Comics character Deadpool, distributed by 20th Century Fox.
 It is intended to be the twelfth installment in the "X-Men" film series, and a sequel to the 2016 film "Deadpool".
 The film is being directed by David Leitch from a script by Rhett Reese and Paul Wernick, with Ryan Reynolds starring in the title role alongside Morena Baccarin, T. J. Miller, Leslie Uggams, Brianna Hildebrand, Stefan Kapičić, Zazie Beetz, Josh Brolin, and Jack Kesy.
X2 (often promoted as X2: X-Men United and internationally as X-Men 2) is a 2003 American superhero film based on the X-Men superhero team appearing in Marvel Comics.
 It is the sequel to 2000's "X-Men", and the second installment in the "X-Men" film series.
 The film was directed by Bryan Singer, written by Michael Dougherty, Dan Harris, and David Hayter, and features an ensemble cast including Hugh Jackman, Patrick Stewart, Ian McKellen, Halle Berry, Famke Janssen, James Marsden, Rebecca Romijn-Stamos, Brian Cox, Alan Cumming, Bruce Davison, Shawn Ashmore, Aaron Stanford, Kelly Hu, and Anna Paquin.
 The plot, inspired by the graphic novel "", pits the X-Men and their enemies, the Brotherhood, against the genocidal Colonel William Stryker (Brian Cox).
 He leads an assault on Professor Xavier's school to build his own version of Xavier's mutant-tracking computer Cerebro, in order to destroy every mutant on Earth and to save the human race from them.
The following is a list of characters who first appear in the ninth series of the BBC school drama "Waterloo Road", in order of first appearance.
 The ninth series consists of twenty episodes, first broadcast from 5 September 2013 to 12 March 2014.
 With the majority of new cast members already introduced in Series Eight, Science Teacher Sue Lowsley completes the main cast in episode one.
 New pupil characters include twins Lenny and Lisa Brown, Darren Hughes, Shaznay Montrose and Archie Wong.
 Episode ten sees the first appearance of Sue's sister Vix Spark, who continues in a supporting role for the rest of the series.
 Episode eleven introduces PE teacher Hector Reid to the main cast, and pupil Gabriella Wark to the supporting cast.
Raza Longknife is a fictional character appearing in American comic books published by Marvel Comics.
 The character is usually seen in the X-Men series and various spin-offs.
 He is the last known surviving member of his unnamed alien race (which chose to die en masse in one final battle against the Shi'ar empire as the culmination of their warrior culture), and a member of the Starjammers.
Midnight Phantom is the 10th installment of the "Precious Hearts Romances Presents" series based on the pocket book of the same title by Martha Cecilia, and is also the first installment to simultaneously air with the 11th installment, "Impostor".
 The series premiered on July 12, 2010, in ABS-CBN's afternoon block.
Mercury (Cessily Kincaid) is a fictional character from Marvel Comic's X-Men series.
 She is a teenage member of the student body at the Xavier Institute and a recurring member of the X-Men.
Josh James Brolin ( ; born February 12, 1968) is an American actor.
 His first role was in the 1985 film "The Goonies".
 Since then he has appeared in a wide number of films, and is best known for his work as Llewelyn Moss in "No Country for Old Men", young Agent K in "Men in Black 3", George W. Bush in "W." and Dan White in "Milk", for which he received Academy Award and SAG Award nominations for Best Supporting Actor.
 Other roles include "Hollow Man", "In the Valley of Elah", "American Gangster", "True Grit", and "".
 In 2015, he appeared in "Everest" and "Sicario".
 He has also made two appearances through motion capture and voice acting as the villain Thanos in the Marvel Cinematic Universe, a role he is slated to reprise in the upcoming films "" and the untitled Avengers film.
 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".