By setting a new pattern with each film, Alien movies previous to Prometheus established a pattern: each presented an SF take on a separate, established genre.
Alien: slasher movie in space.
Aliens: war movie on an alien planet.
Alien3: prison movie on an alien planet.
Alien Resurrection: action/comic book movie in space.
One of the many odd choices about the new flick:
Prometheus: sci-fi movie on an alien planet.