So basically there are some guys in a desert running from something. But then they meet aliens! Flying aliens! Plus giant spiders! And everything turns totally fucking awesome.
Seriously, I don't think the plot is more complicated than that.
This trailer makes me think of those Filipino fantasy soap operas that Elbert Paredes explained so beautifully (with clips) in his videoblog. I cannot wait to see more of any movie that promises aliens and dinosaurs in the same place, at the same time, with flying saucers thrown in for good measure.
Of course it makes sense that if you're going to have a dinosaur lab out in the middle of the desert, you'd create a spider cyborg to guard it.
Check out the official Alien Grey: Zone-X site.
Thanks, Avery Guerra!