After a more mutant-friendly president is elected, things look like they're getting easier for the mutants. The one exception being Scott Summers AKA Cyclops, who is still falling apartb because of the recent passing of his girlfriend, Jean Grey.
Trouble is, however brewing, as it is revealed that a large pharmacy-company has developed what they claim is a complete and full cure for mutants, removing the mutation and all side effects thereof. This provokes Magneto and his brotherhood of mutants, and a three-side war seems unavoidable.
Eric Lensherr: Charles Xavier did more for mutants than you will ever know. My single greatest regret is that he had to die for our dream to live.
Trivia: The combat simulation the X-Men are running on their first appearance in the film features the dread Sentinel robots. Originally, these were meant to appear in the second movie already, but the idea was scrapped. The simulation also bears a close reference to the parallel comic storyline Days of Future Past, where the Sentinels rebelled against humanity, killed most of Earth's superheroes and erected a totalitarian regime in the US.Daniel4646