The universe of Earth-21993 mirrored that of Earth-616 up until the point when Charles Xavier returned to Earth following imprisonment by the alien Skrulls when they attempted to use him as a weapon against Lilandra. There he found human-mutant relations in utter chaos: His own X-Men fractured, Havok brainwashed, Colossus and Dazzler amnesiac, Muir Island under the influence of the Shadow King, and a group known as the Mutant Liberation Front committing terrorist acts across the world.
Xavier called a meeting between the X-Men, X-Factor, Excalibur, and the New Mutants, telling them that they had all fallen apart. Newly appoint New Mutants leader Cable took offence to this and told Xavier that times had changed and the X-Men needed to take a harder line on their enemies. Xavier admonished Cable, calling him a worse threat than Magneto, and ordering him removed from stewardship of the New Mutants. This was met by protests from the New Mutants and ultimately a fight between them and the X-Men, ending with the New Mutants escaping. Contacting Cable telepathically, Xavier swore he would wrest back control of the New Mutants from him, and Cable responded by telling him that he was ready to go to war with Xavier if that was what it would come to. Shortly thereafter while Xavier was meeting with Cyclops and Marvel Girl, Cable assassinated them with a bomb, killing all three.
At the funeral, Wolverine swore vengeance on Cable and vowed to kill him in retribution for murdering Xavier, while Storm believed that Cable should be brought to justice, not murdered. This clash of ideologies lead to the remaining members of the X-Men picking sides. Forge, Colossus, Beast, Strong Guy, and others joined Storm; while Psylocke, Havok, Archangel, Iceman, and Jubilee joined Wolverine.
With the death of Xavier, many of the X-Men's foes capitalized on it to strike back at their enemies. Storm's X-Men were caught up trying to stop a Genoshan incursion on the United States; Apocalypse targeted the Scarlet Witch, leading to a battle with the Avengers; Fenris attacked New York City; and the Mutant Liberation Front attacked the Fantastic Four. Worsening human sentiment towards mutants resulted in them targeting the Morlocks leading to many being slain and Freedom Force being charged with forcing them back underground. While in the Savage Land, Zaladane and her Savage Land Mutates warred on the world to expand the borders of the Savage Land. Other countries were also destabilized by anti-mutant hysteria; Gideon and the Externals began taking advantage of the violence; Mr. Sinister dispatched his Nasty Boys to collect the CEOs of Roxxon Oil, the P.T.L. Club, and the Boy Scouts of America; Sebastian Shaw, fearing the worst, began talks with the President of the United States to restart Project: Wide-Awake.
Meanwhile, Wolverine's team of X-Men tracked down Cable and the New Mutants. In the ensuing battle, Wolverine ultimately killed Cable who died telling him that Xavier was a better man than Wolverine because he had the strength of his convictions and didn't let his emotions blindly cloud his mind from the mission. Wolverine failed to understand the meaning of this. The Mutant Liberation Front next attacked the remains of the X-Mansion, leading to a clash with Storm's X-Men, but they soon retreated. The X-Men were next attacked by Zaladane and her Mutates, leading to the deaths of Beast, Nightcrawler, and Polaris, and ending with the X-Men fleeing their base. Watching this destruction was Magneto, who decided this was the time to try and unite mutantkind.
Magneto eventually killed Stryfe, taking over the Mutant Liberation Front, and began accepting other disenfranchised mutants into his army, including members from both Wolverine and Storm's ranks. Magneto launched an attack on Washington D.C., clashing with many of Earth's non-mutant heroes including the Avengers and the Fantastic Four. As Storm's group mourned their losses, Wolverine's team eliminated Mr. Sinister's Nasty Boys, prompting Psylocke to leave and find Storm's group.
Magneto's group won a victory, taking Washington D.C., however the ousted President of the United States then activated the Sentinels, unleashing them upon America. The Sentinels were easily held at bay by Magneto's magnetic powers, however they cut across the country eliminating mutants and other super-human threats that resisted capture. Those who were captured were put in internment camps. The Fantastic Four, New Warriors, and Savage Land Mutates were all be wiped out. Wolverine's group was decimated, with Havok and Archangel killed and Iceman captured. Wolverine escaped, vowing to get revenge, while Storm and Psylocke joined Magneto's group for sanctuary.
As Wolverine found the beaten Sebastian Shaw, he collected a device from him that could mask him from the Sentinels. Magneto's overconfidence got the best of him as he destroyed Sentinels that were loaded with nuclear weapons, causing an explosion that killed everyone in Washington D.C. Meanwhile Wolverine used the device collected from Shaw to break into one of the Sentinel camps and free Iceman, Sunder, Amphibious, Siryn, and La Bandera to form a new group of X-Men to free the world from the Sentinels' rule.
X-Men (Professor X, Storm, Wolverine, Colossus, Banshee, Dazzler, Psylocke, Gambit, Jubilee, Polaris, Havok, Captain Britain, Nightcrawler, Phoenix, Shadow Cat, Forge), X-Factor (Cyclops, Marvel Girl, Archangel, Beast, Ice Man), New Mutants (Cable, Cannonball, Boom-Boom, Rictor, Warlock, Sunspot, Wolfsbane), Avengers (Captain America, Scarlet Witch, Thor, Quasar, Hawkeye, Iron Man, US Agent, Sersi, Wonder Man), Dark Riders (Apocalypse, Tusk, Barrage), Fenris (Andreas Strucker, Andrea Strucker), Savage Land Mutates (Zaladane, Amphibius, Barbarus, Brain Child, Gaza), Fantastic Four (Mr. Fantastic, Invisible Woman, Human Torch, Thing, Ms. Thing, Franklin Richards), Mutant Liberation Front (Stryfe, Dragoness, Forearm, Reaper, Strobe, Sumo, Tempo, Thumbelina, Wildside, Zero), Freedom Force (Avalanche, Blob, Spiral), Morlocks (Masque, Sunder), Externals (Gideon), Hellfire Club (Sebastian Shaw, Tessa), Shadow King, Nasty Boys (Mr. Sinister, Gorgeous George, Hairbag, Slab), Domino, Quicksilver, Siryn, Strong Guy, Magneto, Daredevil, Spider-Man, Sentinels, Black Tom, Caliban, La Bandera, Dr. Doom, Ghost Rider, Hulk, Puck, Vindicator, New Warriors (Night Thrasher, Namorita, Nova, Firestar)
- 2 appearance(s) of Earth-21993
- Mention(s) (or invocation(s)) of Earth-21993
- 139 image(s) of Earth-21993
- 108 characters that originate from Earth-21993
- 14 teams that originate from Earth-21993
- 2 organizations that originate from Earth-21993