I recently re-watched Day the Earth Stood Still and found it has held up very well. Can't emphasize that the 50s version* is the one to watch not the utterly vapid remake about ten years ago.

I had been trying to remember "Colossus, the Forbin Project." which I saw a couple generations ago, that's how old it was (1970). My memories of it aren't so clear, but I'd also like to mention an episode called "Human Operators" which was done in 1999 as part of the reboot of Outer Limits.

*While the movie was 'based' on a short story from the 30s-40s called "Return of the Master", it was one of the few movies to go well beyond its source material. I think it's damn near as perfect a movie as has ever been made, similar in its progressivism as one of my non-SF favorites, "Inherit the Wind."