Alien is terrifying. Straight up horrifying. Alien excels at creating tension, fear, and everything in between. From the first moment that the chest burster pops through the chest of its unsuspecting victim, Alien succeeds where most horror movies have fallen: creating an enemy that it all powerful. We are terrified because the Xenomorph feels unbeatable and inescapable, especially for the main character Ripley. Try as she might, there is no escaping this menacing creature.