A woman's husband and son are missing somewhere in the woods, and nobody can find them. Unfortunately for her, both are already dead, the first victims of the Alien infestation in Colorado. And no one will find their bodies as Wolf dissolved them with acid.
Wolf, the lone Predator sent to contain the situation, is spotted by hapless sheriff's deputy Ray Adams, who is given away by his walkie talkie. Unfortunately, Wolf has adopted a 'no-witnesses' mindset by this point, and very quickly kills the poor deputy. If you look at it from Ray's point of view though, he spots a strange looking creature in the woods, and without ever knowing what it is, is murdered and skinned while trying to run away. Could you imagine the fear and confusion that he was feeling?
The waitress of a Diner discovers her boss being eaten by a horrifying monster in his own kitchen, moments before it kills her as well.
When Dale, Mark and Nick get into a fight with Ricky in the high school pool, the power suddenly goes out and an Alien decides to jump into the water and attack them. The sight of it swimming so quickly is reminiscent of a crocodile closing in on its prey, and the four of them quickly decide to get out of the pool.
It doesn't stop there. The creature pursues them and kills Mark and Nick in the process. The fact that we don't see what happens to them, just their horrified screams of pain, is plenty of nightmare fuel.
And then Wolf dissolves the Alien and the kid by dumping his acid into the pool.
While Wolf is mending his wounds in a tree, you can hear the sound of people screaming, with some sound of gun firing and panic. It is terrifying to think what the Aliens are doing to people in the distance, and it is alarming how quickly and stealthily the Aliens are spreading throughout the city.
Rather infamously, the movie contains a particularly disturbing scene involving a pregnant woman and multiple chestbursters.
Hell, the entire movie seems to take a disturbing and almost gleeful satisfaction in killing children. While most (though unfortunately, not all) of the child deaths take place offscreen, it is nonetheless made incredibly clear what is happening.
The attending doctor's horrified expression as he discovers his patients being eaten from the inside out is completely rational, as is him being frozen in fear when the Predalien comes around the corner.
Despite its flaws, the film is a good example of just how serious a Xenomorph infestation can be if it's allowed to spread out of control. By the end of the film, the infestation in Gunnison has resulted in the entire town being nuked off the map, with just four known survivors barely escaping the blast. However, before that, the total number of survivors gathered at the evacuation site appears to be just under fifty people, out of a town of what used to be thousands. The fact that the infestation spread and claimed so many victims in just a few short hours suddenly makes the Army's decision to bomb the town look a lot more justifiable, and shows that these things could very easily overrun an entire planet if allowed to.
What makes this more haunting is this is why Lex and Sebastian decided to ally with the Predator in the last movie; They realized something like this would happen if the Aliens escaped.
Consider that the xenomorphs didn't even have a fully set up hive or fully developed Queen laying eggs, even with the Predalien's ability to implant people, limiting their ability to spread. If they'd had those the situation would have been even worse.
