Tons of science fiction movies feature crazy stunts, fight scenes, chases, and explosions. And plenty of action movies have some science-fictional ideas buried in their plot twists. But what's the absolute greatest science fiction (or fantasy) action movie ever made?
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Please include a photo, movie poster or clip of your chosen movie. Plus the movie's title, and maybe a bit about why it's so frakkin great.
Top image: Terminator 2: Judgment Day.