The plot of Prometheus is not complex. It may be tantalizing and/or difficult to follow but only for one reason: it's completely idiotic. What you should know or understand before watching this film can be summed up in one word: LOST. read more
What you should know or understand before watching this film can be summed up in one word: LOST. Prometheus was written by Damon Lindelof, one of the main"architects" of Lost (the TV show), and it suffers from the same defects: great ideas that go nowhere and remain unexplained. read more
I'd say that if you *ever* do intend to watch the Alien movies, watch them (at least the first two, at any rate) *before* watching Prometheus. However, if your only concern is *getting* what's going on in Prometheus, you needn't care. read more