Well, um... wow. This is a difficult one to review, so I am just going to shoot for simplicity. The violence is not good at all, everything from a man getting his fingers bitten off by an alien worm (the sight of which will scare the pants off of most pre-teens), to another man who gets his privates bitten off by the same type of creature, then explains what just happened explicitly. Along with the frequent threat of shooting, a threat which is occasionally carried out, and much more violence from aliens, the violence contributes to the R-rating heavily. The language also contributes to the R-rating quite a bit, literally every word one can think of is used at least twice. Sex is never seen, but talked about very explicitly. These discussions are not frequent, but are definetely there. Morgan Freeman plays a bad guy, which quite surprised me, but despite the Common Sense group's review, I found Freeman's acting quite good. Overall, though not for people under 15, an excellent Sci-Fi film, one of my favorites. If you are a fan of science fiction, then enjoy!