Don’t expect a straightforward timeline, because continuity is a mess with the Alien and Predator timelines (even if, as in this list, you choose to ignore tie-in comics, novels, and games). Predator: ...

Graham Baker's 1988 sci-fi film "Alien Nation" is possessed of a novel, and pointedly political, premise. The film takes place in the near future of 1991, only about three years after an alien ...