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From worlds where Sentinels take over to a universe where Apocalyptic becomes the ruler and one where the entire Marvel Universe is destroyed, here is a look at the mutant crossover events that changed the world.
10) Age of Revelation (2025)
It remains to be seen if X-Men: Age of Revelation becomes as notable as other X-Men mutant crossover events. The new 2025 event series opened with a world where the mutants are the ruling class. It all started with a disease that began to kill non-mutants in Philadelphia, and those who lived became mutants. While the mutants tried to live peacefully in Philadelphia, the United States wouldn’t accept this and tried to launch a nuclear attack, one that was diverted back to Washington, D.C., and the U.S.A. never recovered. It turns out that the mastermind was none other than Douglas Ramsay, the mutant that Apocalypse renamed Revelation, who now possesses the power to compel people to comply through the power of his voice. It is up to Cyclops and other survivors to go back in time to prevent this future from happening. X-Men: Age of Revelation will cover 16 different Marvel Comics titles.
9) X-Cutioner’s Song (1992)
X-Cutioners Song is a 1992 X-Men event series that crossed over with X-Men, Uncanny X-Men, X-Factor, and X-Force. This opens with what appears to be X-Force leader Cable attempting to assassinate Professor X, and shortly after, the Horsemen of Apocalypse launch an attack on the X-Men. This leads to X-Factor and X-Men attacking X-Force as they attempt to locate and apprehend Cable. Mister Sinister is also involved, as he tries to distract the mutants with a war against Apocalypse. The assassin, however, is not Cable. It is his clone, Stryfe, and his Mutant Liberation Front. This introduced Stryfe to the Marvel Universe, and it changed every mutant’s life when the X-Men crossover series unleashed the Legacy Virus into the world, which killed countless mutants over the following years before a cure was found.
8) Onslaught (1996)
When it comes to X-Men mutant crossover series changing the world, nothing did it on a grander scale than Onslaught. Named after the villain, Onslaught was created after Professor X shut down Magneto’s mind when he realized that the mutant terrorist would never stop. However, the result was Magneto’s evil essence transferring into Xavier. This created a new being called Onslaught, which combined the powers of the two mutants. He was so powerful that it took the entire Marvel Universe to stand up and fight him, and it still wasn’t enough. Every hero in the Marvel Universe died, and the whole universe exploded. This led to Heroes Reborn, which rebooted every hero’s series. However, this was all undone when it was revealed that Franklin Richards had created the pocket universe in which this reboot took place. After Onslaught was finally gone, he rebuilt the original Marvel Universe.
7) Inferno (1988)
The Inferno crossover series took place in 1988 and was the result of Mister Sinister’s machinations and Cyclops’ selfish actions. After Jean Grey died, Cyclops resigned from the X-Men and went to live in Alaska in peace. He met a new woman who looked exactly like Jean, named Madelyne Pryor, and the two got married, having a baby named Nathan. However, when Scott learned Jean was alive, he left Madelyne and his baby. Mister Sinister abducted the baby and attempted to kill Madelyne, which led to her transformation into the evil Goblin Queen, blaming Scott for everything. Inferno then splits into the New Mutants battling the demon S’ym for Magik’s soul and the X-Men battling the Goblin Queen as she literally brought hell to Earth. This was the very first X-Men crossover series that spanned various titles, and while it isn’t as good as later stories, it primarily reset the original status quo of the pre-Madelyne X-Men world.
6) House of M (2005)
House of M is a Marvel-wide crossover event in which the entire world was changed in an instant, and only one person knew something was amiss. The story started in a confusing manner, similar to the best mutant crossover events. At the start, the Avengers and X-Men decide that they need to kill Wanda to prevent her from destroying the world after Avengers Disassembled. However, before they can do it, the world changes and everyone is living their best lives, including the mutants, who are no longer feared. Only Wolverine knows something is wrong and realizes that Wanda’s magic created a dystopian world, and he sets out to bring things back to normal. The ending of this crossover series changed the entire mutant world when Wanda realized what happened and said “No More Mutants,” stripping all but under 200 mutants of their powers.
