Onslaught

Fans have been waiting for some time to see another favorite, Onslaught, appear on the big screen, to no avail. He is, basically, the creation of both Professor X and Magneto: after the former erases the mind (and bad intentions, so to speak) of the latter, all of the villain’s evil entered the hero. The entity Onslaught was created, and he’s a being with much power that he managed to kill the Fantastic Four and most of the Avengers before being defeated.
So what if…?
In the movies, we’ve already had Professor X say that he will never enter Magneto’s mind again. What if he is forced into doing it anyway, and, as a result, he creates Onslaught? And this would just be the first movie – the second would see him destroy the X-Men, and the third would bring his defeat. It could work out…
