8 Superheroes Who Saw The End Of The World
4. The X-Men... Like, A Lot
As mentioned earlier the X-Men are pretty much the undisputed kings of the post-apocalypse. It's a good thing, then, that most of these stories also happen to be some of the comic's best, with Days of Future Past and Age of Apocalypse by far the two most prominent.
Although the former doesn't represent the end of the world for mankind as a whole, it does spell the end for mutants, who've all been hunted down by the sentinels. Kitty Pryde has to be sent back in time to avert the timeline, and the X-Men get to breathe a sigh of relief until the next inevitable time-travelling mishap occurs.
Age of Apocalypse was arguably just as messy. When Professor X's son, David Haller, tries to pull a Skynet by going back in time to kill Magneto, he accidentally kills his father instead. This leads to a reality where Apocalypse is able to take over the Earth unopposed by the X-Men, with En Sabah Nur's survival of the fittest doctrine leading to many deaths and some brutal reimaginings of beloved X-characters.
More recently, in Jonathan Hickman, R.B. Silva, Pepe Larraz and Marte Garcia's House of X/Powers of X, it was revealed how Moira MacTaggert was herself a mutant with the specific ability of reincarnation. She lives through nine lives, all of which end in some terrifying future where humanity or some other force wipes out mutantkind, and so in her tenth, she resolves to unite Professor X and Magneto so that they can hopefully avert disaster.