The 25 best science fiction movies of all time

What are the best movies about mysterious planets, visitors from other worlds, and the future on our very own Earth? Check out our picks!

9. 'Aliens'

James Cameron's second sequel on this list, the 1986 action/horror film "Aliens," follows the experiences of Ellen Ripley (Sigourney Weaver), who barely survived her first encounter with an alien "Xenomorph" creature in the movie "Alien," and is now returning to the area with marines. As one might guess from the title, extraterrestrial monsters remain a problem for her. Ripley is a character for the ages as she faces off against the alien queen to rescue a small girl named Newt, and Weaver has never been better.

According to the Australian Broadcasting Network, the alien nest set in the movie was utilized again for the 1989 film "Batman," where it appeared as the Axis Chemicals Plant where the Joker (Jack Nicholson) is transformed into his villainous alter ego.

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