“It's one of the things I'm most excited about in the film,” producer/writer Simon Kinberg said. “They're really protagonists in the movie, as much as Erik and Charles and Hank and Raven and Apocalypse. The final two are really Jean and Scott. In the same way that we told the origin of those four characters in First Class and continued in Days of Future, this is the origin story of Jean and Scott. They're very young characters ... who were struggling with their powers, both of them, at sort of different points in their lives, understanding what it is to be a mutant and controlling or not controlling their powers, and this is a very different Jean and Scott than the Famke [Jansen] and James Marsden characters that we know from the original trilogy. They are almost opposites in some ways. Scott is not the squeaky-clean leader, he's actually kind of a messed up kid who's really struggling to find his place in the world and not happy about being at the school. And Jean, as you saw in the Comic-Con piece, is someone who is also struggling with her power and sort of emotionally and physically struggling with it.”
Scott will get to explore his relationship with his brother Alex Summers aka Havok, played by Lucas Till. Alex was a main character in First Class and then was only briefly seen in Days of Future Past, and now fans will finally get to see the two brothers share the screen.
“We flat out say in the movie that they're brothers and it's something that we were excited to explore,” Kinberg said. “When we came up with the idea for using Havok in First Class, there was always a conversation if eventually we could bring in his brother and we always called him by his last name [Summers]. That in some ways is a big emotional part of this movie, is their relationship.”