This would actually a nice year to year breakdown, like when I very occasionally run down the horror films of some year in the ‘80s. Still, with the Thing being our monster of the day, I thought I’d give people a forum for arguing about the best sci-fi movies of the decade that defined sci-fi movies, the 1950s.
These are the absolute classics, in my opinion, that stand above even the large number of very, very good sci-fi films from that decade:
The Thing From Another World
The Day the Earth Stood Still
War of the Worlds
Creature from the Black Lagoon
Forbidden Planet
Invasion of the Body Snatchers
Incredible Shrinking Man
Quatermass and the Pit (made later)
Man in the White Suit
And…that’s nine. So what’s the tenth movie, even if perhaps a step down from those giants? The Beast from 20,000 Fathoms? Them!? Gojira? 20,000 Leagues Beneath the Sea? The Fly? Invaders from Mars? Do you have another choice? Do you go counterintuitive and demand there be a representative of ‘50s schlock sci-fi here?
There’s a (I think) complete list of ‘50s sci-fi here. Have at it.