Taking place at some indeterminate time after the last film, a group of Army scientists are rigging up a bunch of motion sensors out in the desert at one of their old nuclear test bunkers.
A group of National Guard trainees delivering supplies, later arrive to find the scientists camp deserted and all the equipment smashed. Realising something's amiss, and after receiving what sounds like a distress call on their radio, they head off up one of the nearby mountains in search of what they believe are the missing scientists.
But when they discover what really happened to the scientific team, they find themselves fighting a running battle to make it back down alive. As the Guardsmen, though heavily armed, find themselves hopelessly outnumbered and on unfamiliar territory, as the mutated mountain men show up and start picking them off one at a time.
Whilst It was good to see that they stayed clear of the "teens in peril" format that's so prevalent in many of these films, I couldn't help but notice distinct similarities between this and the film "Southern Comfort", which was another film about National Guardsmen in a remote area having trouble with the locals.
Martin Weisz, who's better known for his music videos, does a respectable job in the directors chair and in keeping with the previous film, doesn't skimp on the gore and graphic excesses, which proves to be equally as nasty in places. If you enjoyed the previous film, you should get an equally good kick out of this one.