I was expecting a cool slasher movie with aliens. Instead, I got an excellent, creepy sci-fi story about 6 kids who try to stop aliens invading their school. It's like The X-Files meets Scream, which isn't surprising considering Kevin Williamson wrote it. This is one of the best sci-fi movies I have ever seen. Don't be fooled by the fact that it's gory, about aliens and is teen-oriented. A must-see for any sci-fi fan!