Readers' Poll: The 10 Best Science Fiction Movies

'The Terminator,' 'Aliens,' 'Blade Runner' and your other futuristic selections

10. 'Terminator 2: Judgement Day'

James Cameron is one of the few directors in Hollywood that really knows how to make an amazing sequel. As he proved with Aliens, he knows it's not enough to merely reunite the old gang and try to recreate the magic of the original. That can only lead to a disappointing retread. Cameron is smart enough to bring in a ton of great new characters and dramatically expand the world of the original while raising the stakes for everybody. In the second Terminator film,  Arnold Schwarzenegger comes back in time to protect Sara Connor and her son John from a new advanced robot made out of of liquid metal. It's been 23 years since they made this thing, and somehow the effects are still impressive. For further proof of Cameron's genius, check out the two horrible sequels they did without him.