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20 Best & Worst Sci-fi Films

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BEST 4. 'Aliens'

It's rare that a sequel outshines it's predecessor. It's even rarer for a sequel to exceed a film as iconic as "Alien." Sigourney Weaver received an Oscar nomination for her return as Ellen Ripley in this film, which was more thrilling, violent and suspenseful than the original. —XFINITY Entertainment Staff (Photo: Fox)

The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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