In X-Men: First Class, young mutants like Charles Xavier (Professor X) and Erik Lehnsherr (Magneto) come together to fight a powerful villain, Sebastian Shaw, who is trying to start World War III. It’s a story about the early days of the X-Men, showing how their powers and friendships formed during a time when mutants were just starting to be known.

A key moment in the movie is when Erik, driven by the pain of his past, decides to embrace his dark side, fully becoming Magneto. This moment challenges Charles’ belief in peaceful coexistence between humans and mutants, setting up the divide that shapes their future.

A popular fan theory suggests that Magneto’s path could have been different if he had accepted Charles’ dream of unity, avoiding the conflict that led to their rivalry. What if Charles had been more patient with Erik’s anger? Could they have changed the world together instead of fighting each other?

An alternate ending could explore a world where the X-Men never split, with Charles and Erik working together to protect both mutants and humans. Or perhaps a prequel that shows the origins of other key mutants, diving into their personal journeys before the First Class team came together.