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Alien is a seven-part American-British science fiction film series that began in 1979 with Alien by director Ridley Scott, whose screenplay was written by Dan O'Bannon and Ronald Shusett. In addition to the feature films, adaptations in fiction and in the form of video and radio plays followed. The crossover films Alien vs. Predator and Aliens vs. Predator 2 are not part of the official Alien film series.