Wasn’t that the plot of the remake of “The Day the Earth Stood Still”?
Not specifically but something like that. They came to end the plague of humans, not save humans from themselves like in the original.
The Twilight Zone had an episode ...
https://en.wikipedia.org/wiki/The_Midnight_Sun
Clip... https://www.bing.com/videos/search?q=twilight+zone+episode+with+freezing+earth&&view=detail&mid=E53FB015D9F7B76B778AE53FB015D9F7B76B778A&rvsmid=6B96D9C322EC2DD217616B96D9C322EC2DD21761&FORM=VDQVAP