7. The Trilobite - Prometheus
Though not all of us were satisfied with the payoff to Prometheus, one thing it unquestionably got right was the creatures; the designs were thoroughly varied throughout, and the movie's biggest, baddest creature resulted in two of the most terrifying movie scenes of the year. After scientist Elizabeth Shaw becomes "impregnated" with an alien creature after her boyfriend gets infected by one, she performs an "abortion" in a terrifying sequence, using the med-bay to extract the creature. However, the creature's accelerated growth pattern means that it matures extremely quickly, growing to full size at the film's climax, just in time to save Shaw before an Engineer can kill her. The creature, called a Trilobite, essentially a giant facehugger, attacks the Engineer and face-hugs it, impregnating it and at the film's revolting climax, hatching the very first proto-Xenomorph. Prometheus may not have given us all the answers we were hoping for, but we'll be damned if this character wasn't one of the most wince-inducing and brilliantly designed of all the year's movie villains.