Jeffrey Canino, who runs a fantastic blog -- Nessun Timore -- chronicling his screening of horror movies, contributes our next list.

"In no particular order:

Westworld (1973, Michael Crichton) - The sort of film that would send Jean Baudrillard into a tizzy. It also makes me wish Crichton had had a longer career as a filmmaker.

Dark Star (1974, John Carpenter) - Strangelove is a better film, but Dark Star might be as funny. As slipshod and cheap looking at it is, its satire bites hard.

Fantastic Planet (1973, René Laloux) - Fantastically animated, trippy-as-all-heck social SF tale preaching tolerance at the beginning of a decade that hoped to foster some.

Stalker (1979, Andrei Tarkovsky) - Coming only two years after, Stalker was the antithesis of Star Wars. It re-defined what SF cinema could be, and has consequently been ignored by most viewers outside the arthouse crowd since. Can one even imagine what SF might have become in the 1980s if Stalker had proved more influential?

Altered States (1980, Ken Russell) - A messy and hallucinogenic tale that probes the borders between science, mysticism, and humanity. Silly at times, but undeniably powerful by its conclusion.

World on a Wire (1973, Rainer Werner Fassbinder) - The only film I've seen that accurately adapts the dryly humorous existential malaise of late '60s/early '70s New Wave of print SF to film. Sprawling in length, but claustrophobic in intent.

Blade Runner (1982, Ridley Scott) - Its philosophical weight might be overvalued, but there's no denying that Scott and his crew whittled PKD's distracted novel down into the most distinctive and awe-inspiring SF vision of the future that cinema has yet seen.

Primer (2004, Shane Carruth) - A film that obliterates the Hollywood notion of time travel as a blissful adventure without consequences. Made for peanuts, it's as engaging as any big-budget SF film ever made (if not more).

 Metropolis (1927, Fritz Lang) - A classic for a reason. Visionary, intelligent, and still a marvel to behold all of these decades later.

La jetée (1962, Chris Marker) - About as beautiful and melancholic as SF can be, and it accomplishes this in less than half an hour."

Another vote for Dark Star! And I'm happy to see another notch for Primer.  I have Fantastic Planet at home right now....