Just recently, scientists at NASA seemed to have discovered alien life in the form of microbes. They follow an increasing band of thinkers -- and commoners -- who have begun to believe in the existence of extra-terrestrial life; the most prominent votary amongst them being Stephen Hawking.
But Hollywood has never been alien territory for the little green guys, nor has it denied the existence of un-earthly planets where Darth Vader and his evil designs may exist.
So who's causing mayhem this time? Definitely not the cutie from E.T., nor the funny shape-changers from Men in Black. This time, it's a marauding army of mean metallic robotic forms that crowd the screen, mostly in silhouette and sounds. They may have gooey insides, but there's nothing soft about them. They believe in action alone and see no reason to explain their misdeeds in exolanguage or maybe even sign language. The harried human race can only guess why they are here: for our resources; for colonisation, hence the mass annihilation, explains the senior marine while deploying his troops for the counter-attack.
__________________
steroidvince delmonte