X-Men: Days of Future Past (PG-13)
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This came out in 2014, but I didn't see it until 2021. I guess the story was based on an arc in the comics, but I never read that. It may also have been adapted into other media since it was first published, but I don't think I saw any of that, though the story reminds me a bit of the animated series Wolverine and the X-Men. This movie also has at least one character who was familiar to me from the TV series The Gifted, though she's played by a different actress, and I don't think that show was part of the same continuity as this movie. Anyway... I guess the movie did pretty well both critically and financially, but for the most part I thought it was good, but not really great. There were things about it I liked a lot, and I loved the scenes with Peter Maximoff (Evan Peters; who in a nice bit of stunt casting also appears as Pietro Maximoff in the 2021 MCU series WandaVision, which I saw before this; but of course that series is set in a different continuity than the X-Men movies).

So... sometime in the future, I'd guess around 2023, since in 1973 the future is referred to as "about 50 years from now", there is a war against mutants, fought by robots called Sentinels that have the ability to adapt to any mutant power. There aren't a lot of mutants left at that point, so in a last ditch effort to change the future, Kitty Pryde sends Wolverine's consciousness back to 1973 (where characters are played by their First Class actors), to inhabit his younger self's body. (I never heard of Kitty having that power, which definitely confused me.) He's supposed to convince both Charles Xavier and Magneto help him convince Raven/Mystique not to kill a scientist named Bolivar Trask (Peter Dinklage), because that act had convinced the world of the danger posed by mutants. More importantly, she was captured and her DNA was used to develop the adaptive abilities of Sentinels in the future. It takes a little while for Wolverine to convince Xavier of his story, and to agree to help, along with Dr. Hank McCoy/Beast (Nicholas Hoult), the only other mutant left at the Xavier Institute. It's harder to get help from Magneto, because they first have to break him out of a high security prison under the Pentagon. But they get help from Peter Maximoff, for that. He was awesome.

And... a lot of other stuff happens, mostly involving Mystique trying to kill Trask, and Wolverine, Xavier, Magneto, and Hank trying to stop her. I don't want to go into details about all that, but it was entertaining enough, I guess. The only other thing I want to mention is that there's a brief post-credits scene with some mutant guy building pyramids or whatever. I don't know what that was about, but I assume it sets up the next X-Men film, "Apocalypse".