Today, March 21, in ’75, surveillant LUH 3417 replaces her factory worker roommate THX 1138’s government-mandated medications, freeing him from mind control (THX 1138, 1971)
2001: A Space Odyssey
Dark Star (film) (1974)
THX 1138
I don't know either. I'll start of with those, if you don't at least know 2 of them ... please, don't even bother to try to add another one.
But if you do......... you're welcome to expand this All Time Must See Scifi List as you see fit.... (And yes, maybe even expanse fits in there.. but no less)...