Alien vs. Predator (2004) combines two great flavors that everyone likes - Aliens and Predators! Actually, they are both aliens, as well as predators. Oh well.
This one starts on Earth, with genius industrialist Charles Bishop Weyland (Lance Henriksen) getting satellite intel of a heat source deep under the Antarctic ice. Computer imaging reveals a pyramid with details resembling Aztec, Cambodian and Egyptian. (Details, from thermal imaging. Under a mile of ice. Anyway.) He rushes to get an expedition together because he knows that if he can be the first to reach it, he can .. dare we say it? Well, it isn't clear why, but he wants it bad.
The leader of the expedition will be a feisty mountain guide played by Sanaa Lathan. Then there are some sexy scientists, a band of mercenary bodyguards, and a nerdy guy who kept showing pics of his kids. He also wore a red shirt, and went by the nickname "Deadmeat". Oddly enough, so did everyone else.
Actually, I thought the nerdy guy (Ewen Bremner) was going to be the robot, the "Bishop". I'll let you keep guessing on that one.
Anyway, once they get under the ice, the setup begins to become clear. First, a batch of Alien eggs hatch and face-hug some of the expedition. This leads to chest-bursting and adult Aliens running around. It seems that the Predators set up this pyramid complex so that they could hatch Aliens (using humans as hosts) to hunt as a rite of passage. So, SPOILER.
To continue spoiling, Lathan gets the idea that they need to team up with the Preds to get the Aliens - especially to keep them from getting out into the world at large. I'm not sure how to feel about that - I didn't mind when the Predators acted honorably at the end of Predator II. But actually teaming up with them?
There was a point where someone talks about the two kinds of monsters and mentions the "humanoid" ones. I was like, "which ones are those?" but I guess you're meant to think of the Preds as closer to human than the Aliens. OK, I guess, but I'm not sure I like it. Shouldn't both of these deadly blood-thirsty creatures be our implacable enemy?
Whatever. As long as we don't cozy up with these guys too much, we'll keep watching,