Presuming that anybody reading this has heard of the creatures that appeared in four "Alien" movies and two "Predator" movies and can easily figure out the premise from the title or from the first "Alien vs. Predator" movie. "Requiem" starts right where that last movie finished off with a Predator spaceship carrying lots of alien "facehuggers" crashing on earth in the forest just outside a Colorado town. It's not long before those alien breeders are looking for faces to hug and finding them in abundance. Once reports of the crashed ship gets back to the Predator homeworld, a Predator detective-slash-cleaner is sent to earth to stop the aliens from infesting another planet.