A big part of the “X-Men: Apocalypse” is the main villain Apocalypse and his four horsemen– a group of mutants that Professor X was originally intended to be a part of. It is now revealed that Professor X is the original fourth horseman.
According to Cinemablend’s interview with producer Simon Kinberg, earlier scripts show that Professor X was to be part of the horsemen. The scripts reveal that there were originally three primary horsemen and that Apocalypse intended to kidnap James McAvoy’s Charles Xavier and convince him to change sides.
The mutant Psylocke wasn’t supposed to be in ‘X-Men: Apocalypse‘ and after looking through the horsemen from the comic books they decided on three. Knowing that Charles was going to be kidnapped they decided to make him the fourth horseman to complete the four horsemen of the Apocalypse.
According to Screen Rant, Kinberg and director Bryan Singer later decided that Xavier did not fit the bill. Getting back to the comics they found Psylocke to be an interesting fit and luckily Kinberg just stumbled on the perfect actress to portray the mutant.
He had just met with actress Olivia Munn about ‘Deadpool’ and although she didn’t land a role in the R-Rated blockbuster, still found a way for her to be in an X-Men film. After deciding that Psylocke was going to be the fourth horseman Kinberg suggested Munn to Bryan Singer when they were both in Montreal.
They later went on to Google her and lo and behold — a fan art Olivia Munn as Psylocke! Olivia Munn later signed up for the film rounding up the four horsemen a few weeks before production.
With Storm, Angel, Magneto, and Psylocke now the face of the villains, it would have been interesting to see the calm face of Professor X alongside them. See them in all their glory in ‘X-Men: Apocalypse’ scheduled for release on May 27th, 2016.