Wow. TOUGH call. Just gonna go with my first thought that stuck with me. SO many good ones. I’m going with “Alien”.
Empire Strikes Back
War of the Worlds (NOT the crapola version with Tom Cruise)
When Worlds Collide
2001: A Space Odyssey
Star Wars Ep. IV
Star Trek IV
Star Trek 2010
I just gotta add, “The Day the Earth Stood Still” and “The Time Machine” (the originals)
The Thing From Another World (1951)
Metropolis (the restored copy as seen on TCM)
I thought I was the only one who was going to say “Forbidden Planet” but apparently there are a lot of us. Also had the hottest girl.
Invaders from Mars. (the original one)
The first and second Star Wars movies. I have no idea what episode they were.
Hard to say but the following come to mind:
War of the Worlds - 1953 version
I also like The Thing with Kurt Russell and loved the new Battleship movie; I thought that was much better than I thought it was going to be.
I developed a fascination watching the old B&W sci-fi movies that came on after the news on Friday night. Anything that had to do with flying saucers or aliens and I was glued to the television set. We’d pop some popcorn and fix some koolaid or cokes and sit down to watch it and make a night of it. If lucky I would be able to see 2 “monster” movies until I fell asleep around 2:00 in the morning. Those were good times.
Modern sci-fi I would say Bladerunner, The Fifth Element, Star Wars and Star Trek obviously. Seremity is there for the very recent sci-fi and I am drawing blank thoughts on very recent sci-fi.
I’ll leave the classics to othere, I have my favorites and the top of the list is of course The Time machine. The George pal version, not the ones after it though arguably the latest one was a keeper.
There was a Gene Autry serial with the “Thunder Riders” who were actually spacemen. Of course the special effects were not that great, for instance they would drop little bombs out of a Piper Cub etc. Instead of having lasers.
The stories were very watchable tho.
Bladerunner, Dune and Star Trek - The Wrath of Khan
Serenity number one followed by Empire Strikes Back. Also, do monster movies count (it seems that’s more of what Sci Fi channel shows now). If they do then Dog Soldiers (a low budget film with a squad of British Soldiers fighting werewolves in the Scottish Moors) rounds out the list.