The Top 40 Sci-Fi Movies of the 21st Century

From space-invader thrillers to interstellar-overdrive headscratchers, we're counting down the best science fiction films since the turn of the century

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ThinkFilm/Courtesy Everett Collection25/40

25. "Primer' (2004)

Shane Carruth's 2004 mind-bender was made on the cheap – reportedly just $7,000 – though this little film doesn't shy away from asking big questions: the philosophical implications of tampering with time, the weighty responsibilities of playing God, and, if you'll indulge us for a second, what the heck is happening? From its tech-heavy dialogue to the loop-the-loop storyline (so complex it requires a chart to comprehend), Primer is the rare film that makes no attempt to pander to its audience. Sure, it's confusing, but that's partially the point. No one ever said Sci Fi should be easy. JM

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