This thread is for sci-fi—I’ll do fantasy movies separately. Superhero movies similarly.
5. Star Wars. It kicked off the biggest sci-fi franchise in the world. Sure, Empire is better. But this is the one which launched the franchise and the one I remember most from my childhood.
4. Bladerunner. I don’t ‘love’ this movie but I recognise it for its importance. It basically invented cyberpunk. The visuals are gorgeous. It dries with atmosphere. The worldbuilding is epic. This is such an important movie.
3. Terminator 2. The first was great but T2 is one of the top action movies of all time. And it still holds up today!
2. The Wrath of Khan. I enjoy Voyage Home more, but this is the better sci-fi movie. It’s not just a good Trek movie, it’s not just a good sci-fi movie. It’s a good movie.
1. Alien. It presented sci-fi to me in a whole new light. A horror movie with space truckers. It was this or Aliens, which I love even more, but I have to give it to Alien for inventing the franchise.
That's a killer list.
Five is hard to do, but this is my best attempt for today:
5.
The Terminator. Barely edged out T2 for me, in part because some of the humor in T2 is a little lame. Just a super tight, suspenseful script and story. Both have amazing scores.
4.
Blade Runner. Some bits of it haven't held up for me, but overall it's so gorgeous and influential and enthralling. Hauer's work as Roy and that soliloquy/monologue he created for the end climax is utter poetry. At times in my life this has been my favorite film.
3.
Aliens. Alien I categorize as slightly more in the horror category than sci-fi. Both are among my favorite films of all time. This is just another wonderfully-written, suspenseful, incredibly well-shot and edited and performed movie. Awesome score. Endlessly rewatchable and quotable.
2.
Star Wars: A New Hope. The Empire Strikes Back being a better movie is proverbial now, but this one has so much. So much worldbuilding, such groundbreaking special effects, such a singular aesthetic vision, so much rewatchability. One of the greatest film scores of all time. Even Lucas' weird dialogue contributes to the effect, but we have to thank Marcia Lucas and Richard Chew in particular for editing this into such a near-perfect package.
1.
Children of Men. Dark horse contender, I know, but IMO this is a perfect film. Perfectly grounded in our world, gorgeously shot and wonderfully acted, brilliantly written. Suspenseful, unpredictable, immersive. And with one of my favorite flawed protagonists ever. Next time you watch, notice his interactions with animals and with weapons.
My top honorable mentions have to be Her and Blade Runner 2049. I think both of them have a real chance to get on this list once I watch them some more.
Others vying for top 10 include Wrath of Khan, T2, Gattaca, Primer, Arrival, Moon, and Back to the Future (another perfect film). Maybe 2001 for Hal and for the visuals.
Edit: And The Matrix, of course. Forgot it initially.
I classify The Thing and Alien more as horror than sci-fi, so I get to sidestep the agony of putting those up against my final top 5. They're two of my very favorite movies ever.