Remember the old game 'Half-Life'? It's possibly the best game ever made along with the second one. I never had a good enough computer for the Half-Life 2 but I spent hours playing the first one. The game engine was really what allowed those games to flow and have really decent graphics. They weren't ultra realistic but were just enough to make it incredibly immersive. The other thing was the perfectly timed 'surprises'. Even if you were expecting it the alien creatures and the commandos could jump out at you so fast you'd be left swinging your crow-bar aimlessly.
Anyway, some fans loved the games so much that they made a fan-made short movie with a couple extra bucks they had lying around. Actually it was only $1200 which is what makes the quality of this movie so incredible. This movie has been a long time coming (I remember reading about it a couple years ago) but man is it worth it.