Fox is on a roll with X-Men.

"I've gotten to explore Professor X when he was an older, bald, wise man, when he's insecure, when he's defenseless, when he's powerful. He's more of a Christ figure,” Singer said. “He chooses to be a teacher. He could go inside Cerebro and rule the world, but he chooses not to. He chooses to teach and preach and hope that people follow his message: peace and unity. And I've gotten to see him as a drug addict and a loser, and in this movie you're going to get to see him prosperous and almost blindly optimistic, and how he changes.”

Professor X’s evolution is tied to that of the X-Men, so as we see him become the (bald) mutant leader we are more familiar with, his team of X-Men also form into something more recognizable.

“This movie is ultimately not just about the defense of the world itself, but it's also about the formation of the X-Men,” Singer said. “We've never really seen that. In X-Men: First Class, there's a group that forms for the CIA, and most of them are killed. Here, we get to see a reluctant Professor Xavier actually be given motivation to form a group that will ultimately become the X-Men. We see the birth of that in this movie. So this movie is the conclusion of six movies, in a way, for me, personally, but it's the birth of a whole other idea."