Alien II was a 1983 script treatment for a sequel to Alien, written by James Cameron. It is a very basic outline of his intentions for the film, establishing the basic course of events but containing very little in the way of dialogue. Cameron continued to work on the story and the treatment eventually evolved into the film Aliens; in fact, the first half of the treatment is virtually identical to the finished movie, although the second half differs quite substantially from what was ultimately made. It was followed by the first draft of what would become the final Aliens shooting script, also written by Cameron.