I've mentioned this before, and it's probably a pre-
Crisis reader's problem; but every time there's a storyline where the timeline is altered, I think something like "...and in the new timeline, earth was destroyed in 1973, when Captain Man wasn't there to stop Hateface in
Tales to Admonish #413." This probably dates back to the
Challenge of the Super-Friends episode "
Secret Origins of the Super-Friends," where the Legion of Doom travels back in time to throw various wrenches in the origins of Wonder Woman, Green Lantern, and Superman: in the altered present, a "Superman Day" parade becomes a "Hawkman Day," and I swear there's no timeline where he's ever looked happier.
But, hadn't Superman saved earth from asteroids and meteors and such, like dozens of times? Hawkman wouldn't have been set up for that, and earth would've been pulverized at some point. Take out the wrong load-bearing piece, and the whole thing'll collapse before you even get to a new present time. Let's see if that happens here!
From 1995,
X-Men Chronicles #1, "Origins" Written by Howard Mackie, pencils by Terry Dodson, inks by Klaus Janson.
This is maybe what
X-Men #1 would have been, in the Age of Apocalypse. Instead of being Jean Grey's introduction to Xavier's school, this was Mystique dropping Rogue off at Magneto's training base at scenic Wundagore Mountain. Magneto worked his mutant students hard, with a "Killing Zone" simulator instead of a Danger Room; but also waded in there with them: he was a bit more 'lead from the front' than Xavier. Feeling the students were perhaps a bit sheltered, he introduces them to some new dangers, with new member Weapon X, Logan.
Meanwhile, instead of Magneto attacking an air force base, in this timeline the Heralds of Apocalyspe attack it: Gideon, Candra, War, Death, and Sabretooth. Magneto leads the X-Men into battle, leaving his daughter Wanda in charge; neither realizing that Nemesis was approaching. As they leap from their damaged aircraft, Magneto wonders if they're ready: his X-Men seem gung-ho, but unaware of the stakes.

Back at Wundagore, Rogue and Wanda defend the younger mutants from Nemesis: Rogue had absorbed, perhaps permanently, the powers of Polaris, so she was able to fly. And at the air force base, Sabretooth is horrified that Apocalypse actually intended to use nuclear weapons, and Apocalypse orders the others to attack him. (With little prompting: Sabretooth was not particularly likable.) He's contained in a telekinetic bubble by Candra when the X-Men arrive, and manages to talk his way back onto the team: maybe he still dies, maybe he proves himself to Apocalypse. Sabretooth gives some strategy to the others, then throws down with Weapon X. While the other Heralds are defeated, Sabretooth is disabled with a severed spine. Somewhat surprisingly, Apocalypse orders his Heralds, save Sabretooth, back to him; I thought he would leave them to sink-or-swim. Apocalypse's Ship was going to open fire, but Magneto stops it, yet can't keep Apocalypse from leaving.

And at Wundagore, while she managed to save the others (and I'm pretty sure Nemesis was messed up but would live) Wanda was mortally wounded. She tells Rogue, that her father would need a friend, and Rogue promises to be there for him. Wanda
probably didn't intend that to mean "please hook up with my dad," but sure. Also, we only see Quicksilver briefly after Wanda dies, but already he seems to have a less-weird relationship with her than in our world.
I had thought this was a late addition-slash-cash grab, after
Age of Apocalypse turned out to be a huge success, but these two issues of
X-Men Chronicles replaced the usual quarterly
X-Men Unlimited, so maybe they were always part of the game plan. There was another title,
X-Universe, that followed some of the usual Marvels through the AoA, where I think they were by-and-large chewed up and spit out; and I also wonder if that was always planned or a later add.
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