I've seen and appreciated a number of sci fi movies for the reasons that 2001: A SPACE ODYESSY held (which I finished watching again two days ago by coincidence).
Alphaville - Haven't seen, but I've put it on my list.
La Jetee - Haven't seen, don't know anything about it.
The Man Who Fell to Earth - saw it years ago. Considered a classic independent.
Brazil - A bizarre and creatively different movie, captivating.
The Quiet Earth (Geoff Murphy) - Haven't seen.
28 Days Later - More sci fi horror than alien fascinating adventure.
28 Weeks Later - Haven't seen. I may never see it.
Soylant Green - Classic dystopian future movie.
Blade Runner - Classic of course, though not much really in regards to aliens rather than replicants.
Gattaca - Under-rated, though not really alien in nature, more about our own furturistic society in regards to genetic discrimination.
1984 - There were two versions. Classic dystopian futurist vision basic on George Orwell's novel.
I would add:
Silent Running. Environmentalist sci fi film (non-alien).
Logan's Run. Age discrimination sci fi (non-alient).
Forbidden Planet. Advanced alien technology in hands of primitive humans.
Alien. About an alien (the real deal here).
THX-1138. Another dystopian future about ourselves. Considered a classic.
Wavelength (1983). Little seen and overlooked movie about aliens.
The Day the Earth Stood Still (1951). One of the true classics about aliens.
Slaughter House-Five (1972). A Kurt Vonnegut novel-based movie. It's as far out of there as any sci fi movie.
Rocky Horror Show. What else can I say.
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