Yet another film with an escaped alien chasing people around an underground complex. This one however throws in a couple of changes to the usual formula by having a few different aliens, your two usual killing machines plus one shape changing individual who can take the form of anyone it touches. Just so the film can copy scenes from the Thing as well as Aliens.
This is all based in Area 51, where some nosy journalists are invited to look around the non-alien part of the complex. You got your straight laced journalist and the web-based smart arse journalist, looking for the 'truth'. I wouldn't quite dwell on any characters here though, as halfway through their tour the aliens escape and that's when the fun begins.
The story might be generic, but at least there's plenty of gore to keep you awake. Folks are torn to bits, shot, have their faces torn off and even have their heads stamped on, so the film has that going for it. It's always quite fast paced, so it'll do as a not bad time waster. Not a lot of CGI which was a good thing. If you skip it, you won't have missed much.