When it comes to sci-fi, it's often all about grand space adventures and intergalactic exploration, all of which tends to imply the involvement of alien lifeforms. From Star Wars to Star Trek , and from 2001: A Space Odyssey to Alien , several of the greatest sci-fi films of all time have alien characters. Not all of them, though. A precious few sci-fi movies perfectly understand that the charm of the genre lies not necessarily in visiting other planets, but rather in the endless possibilities that it provides for imaginations to run wild.

Despite their lack of extraterrestrials, these films are still some of the most creative ever made. Perhaps it's a cult classic like Donnie Darko , or a genre landmark like Back to the Future , but no matter the case, there's

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