
Wikipedia
In ancient Egypt, the mutant En Sabah Nur, who thinks himself as a god, is
burried in the middle of a body transfer process by a handful of rebels. In
1983, the tomb is dicovered in the middle of Cairo, and En Sabah Nur awakens.
Discovering that people barely believe in gods (and in him) anymore, he
decides to conquer the world. He gathers four disgruntled mutants (including
Magneto, whose wife and daughter got accidentally killed by an angry mob) and
travels to Xavier's school to abduct the professor, indirectly causing the
destruction of the building. A handful of mutants are then captured by
Stryker, while a small group manage to follow Stryker to his lair. There they
free Wolverine who kills all the personel of the base. All the mutants are
soon free and steal Stryker's prototype airplane to go to Egypt and save
Xavier. The latter had been forced to broadcast a message from En Sabah Nur,
stating that the apocalypse has come and tha only the strongest of the
believers will survive. The mutants fight En Sabah Nur and finally vanquish
him (not without causing massive amounts of destruction all over the world),
thanks to Magneto, whom Xavier turned towards good once again. At the end, the
X-Men are reforming, even though Xavier would have preferred not.