One of the most memorable and brilliant opening lines in sci-fi movie history is from an incredible film that boasts a Rotten Tomatoes score of 94%.

Steven Spielberg returns to alien storytelling with Disclosure Day, a global thriller exploring what happens when humanity learns we are not alone.

Save for the Predator franchise's Yautja and Alien's Xenomorphs, these are the coolest extraterrestrials to ever grace cinema history.