Freaking aliens. Even when cute and friendly, they can turn into nightmarish abominations with a simple change of skin color. Of course, most of the time they never even try to be cute and friendly. Most of the time they're like Universal's The Thing - unearthly creatures of pure terror.
So in honor of Universal's latest attempt to bring the horrors of the night sky down to our playing field, we've selected the ten scariest aliens you can find in cinema. We're not talking aliens that just look scary, either (though that certainly helps). This is a list of extraterrestrials that should all be killed on sight, whether they look terrifying or have an insidious agenda.