movie was released in 1979, with many more to follow:
Alien 3 (1992),
Alien vs. Predator (2004). Our
favorite is the 1986 release, where we find that earth
has lost contact with a colony of humans, and the
Marines are sent in to investigate. Instead of a
colony of humans, they find a colony of Aliens.
This is one of best sci-fi/horror movies ever produced.