The dispute became especially complicated because Hill and Giler did make substantial contributions, rather than merely performing cosmetic rewrites. Their work helped create the film's treacherous android Ash and made the dialogue more natural, while Shusett eventually acknowledged that the Ash material was 'one of the best things in the movie.' O'Bannon, however, maintained that the revisions were not improvements and accused the producers of attempting to appropriate the central creative work. The final shooting script therefore reflected a contested chain of authorship: O'Bannon and Shusett originated the story and major horror mechanics, Hill and Giler rewrote the screenplay and added key structural elements, yet the Writers Guild of America ultimately awarded O'Bannon sole screenplay credit. The ruling preserved his official authorship but left a long-running historical argument over how much of Alien's finished script belonged to its producers.
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