What is alien vs predator about?

Answer 1

It's mainly plotted in the idea that the Predator's came to this planet long ago and visited the peoples of ancient Mexico who hailed them as gods come to earth, the Predator's would "impregnate" the indigenous people to host the Alien fetuses till they were ready to blast out of the chests of the sacrificial where the Predator's would then hunt the Alien's for sport. In the event that for whatever reason the Predator's would fail and the Alien's would get out of control, they would use their self destruct feature and wipe everything out. This is the reason for the monicker "Alien vs. Predator". There is of course more to the story, but too much to type.