Alien: Engineers - the original script for Prometheus.
Were you perplexed and mystified by the behavior of the Prometheus crew? Well, it'll all make sense once you watch this helpful training video. [slyt]
Alex Pappademas and Sean Witzke over at Grantland have a long, detailed, super geeky film-nerd discussion of the Alien franchise. "It's important to note here that this is a nuke-it-from-space kind of conversation in which just about every aspect of the original "Alien Quadrilogy" is spoiled, as are some fairly crucial plot points from Prometheus. The Alien vs. Predator movies are neither spoiled nor discussed, because that would mean acknowledging their existence. Some people will undoubtedly view this as curatorial negligence on our part, but we welcome their scorn. "