When you enter a movie called "Alien vs. Predator," you expect to see two of sci-fi's greatest monsters duke it out in a no-holds-barred championship match. It's right there in the name ...

Yet Alien vs. Predator has warranted no 20th-anniversary rereleases, despite the fact that this momentous occasion nearly coincides with the release of Alien: Romulus, which comes 20 years and ...