X2

A military scientist raids the school for mutant children, and the two sides who spend every film arguing have to work together.

The first film had to explain what a mutant was. This one does not, and it uses the room that buys to do something the genre rarely tries: it puts the heroes and the villains on the same side without pretending the argument between them has been settled.

William Stryker is a soldier who wants every mutant on Earth dead and has the machinery to do it. Against that, the school and the Brotherhood are the same minority with two strategies, and the film is honest that only one of them was ever going to be proved right by the ending.