This is Time Out's list of essential sc-fi movies. Bold what you've seen, italicize the ones you like and strike out the ones you didn't like.
The Abyss (1989)
Alien (1979)
Batteries Not Included (1987)
Cocoon (1985)
Battle Beyond the Stars (1980) I LOVE THIS MOVIE!!! Magnificent Seven in space including ROBERT VAUGHN. (Not to mention George Peppard and OMG John Saxon.)
Battlefield Earth (2000)
The Black Hole (1979)
Cherry 2000 (1987)
Close Encounters of the Third Kind (1977)
Contact (1997)
Sphere (1998)
Critters (1986)
Dark Star (1974)
The Day the Earth Stood Still (1951)
Dune (1984)
Earth vs The Flying Saucers (1956)
Enemy Mine (1985)
Event Horizon (1997)
Explorers (1985)
The Fifth Element (1997)
Sunshine (2007)
Flash Gordon (1980)
Flesh Gordon (1974)
Forbidden Planet (1956)
The Fountain (2006)
Howard the Duck (1986)
Invasion of the Body Snatchers (1956)
Invasion of the Body Snatchers (1978)
The Hidden (1987)
The Last Starfighter (1984)
The Man Who Fell To Earth (1976)
Mars Attacks! (1996)
Metropolis (1927)
Morons from Outer Space (1985)
Pitch Black (2000)
The Chronicles of Riddick (2004)
Planet of the Apes (1968)
Quatermass and the Pit (1967)
Red Planet (2000)
Mission to Mars (2000)
Repo Man (1984)
Brother From Another Planet (1984)
Serenity (2005)
Silent Running (1972)
Solaris (1972)
Solaris (2002)
Soylent Green (1973)
Spaceballs (1987)
Spacehunter: Adventures in the Forbidden Zone (1983) Another awesome piece of cheese. Peter Strauss tries to be Harrison Ford!
Ice Pirates (1984)
Solarbabies (1986)
Star Trek II: The Wrath of Khan (1982) KAAAAAAAAHHHHHHHNNNNNNN!!!! So much love for this movie, including Kirstie Alley! Anyone who doesn't cry when they play Amazing Grace is heartless.
Star Trek III: The Search for Spock (1984)
Star Trek IV: The Voyage Home (1986)
Star Trek V: The Final Frontier (1989)
Star Trek VI: The Undiscovered Country (1991)
Star Trek Generations (1994)
Star Trek: First Contact (1996)
Star Trek: Insurrection (1998)
Star Trek Nemesis (2002)
Star Trek (2009) Bloody amazing.
Star Wars Episode V: The Empire Strikes Back (1980) Major disappointment at the time, improves in retrospect. "Laugh it up, fuzzball!"
Starship Troopers (1997)
Supernova (2000)
The Thing (1982)
Things To Come (1936)
This Island Earth (1955)
Total Recall
2001: A Space Odyssey (1968) Trippy!
War of the Worlds (1953)
War of the Worlds (2005)
Independence Day (1996)
Zardoz (1974)
Well it got me through another boring Webinar.