The fourth film in the Alien series, directed by Jean-Pierre Jeunet (Delicatessen, The City of Lost Children) at a cost of $70 million, takes place aboard an immense ship, the Auriga, where General Perez (Dan Hedaya) heads a staff of seven science officers and 42 enlisted, all employed by United Systems Military (replacing the Company of the earlier films). The time is 200 years after the events of Alien 3. Scientists researching the aliens need hosts, and they rely on space mercenaries who make spacecraft raids to acquire bodies for the scientists. The research requires an Alien Queen specimen, so Ellen Ripley (Sigourney Weaver) has been cloned from preserved blood samples. The scientific team then removes the baby Alien Queen from Ripley's chest. Since the Ripley clone has alien DNA mixed into her genetic structure, she is not totally human. Later, a commercial freighter, the Betty, arrives with a crew of mercenaries
Originally posted to YouTube by TheRealFatSquatch, this is Siskel & Ebert's review of the movie.
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