Kitty Pryde and Nightcrawler are seriously injured in this missi

In the midst of this situation, the original Jean Gray is found in animation suspended in a capsule on the seabed by the Avengers. Once it regains its stability, Jean meets with Cyclops, although their relation is made impossible by the marriage and recent paternity of him. The United States government calls on Cyclops, Jean and the rest of the original X-Men to work for them on a new team called X-Factor. Meanwhile, the X-Men form an alliance with the Hellfire Club to fight the Nimrod. In that battle Rachel disappears mysteriously.

The Morlocks, mutant refugees in the sewers of New York, are killed one by one by the Marauders, a group of murderers in the service of a new villain: Mr. Sinister Cosplay Shop
. The X-Men, the New Mutants and X-Factor come separately to their aid. Colossus, Kitty Pryde and Nightcrawler are seriously injured in this mission. The first confrontation between Wolverine and his arch-enemy Sabretooth, member of the Marauders, takes place. In the midst of this crisis, the X-Men accept a new member: the mutant British telepath Psylocke. The group, reduced to Wolverine, Rogue, Psylocke and Storm, along with an often absent Magneto, will then recruit new members: the former singer Dazzler (who had already starred in his own series), and Longshot.

Longshot is a humanoid from a parallel dimension controlled by Mojo, an evil slave creature. Mojo and his assistant, the six-armed sorceress known as Spiral, will become a constant nuisance to the X-Men in their eagerness to take them as slaves to their world Animation Style Costumes
. Eventually Colossus (healing of his wounds) returns to scene just in time to join the next battle.

The X-Men fight an evil entity known as the Adversary in the city of Dallas, Texas. It is assumed that in this battle the X-Men perform the supreme sacrifice: their own lives to end the Adversary. This will not mean the real death of the X-Men, but a new opportunity. Rome, the guardian of the Omniverse, "resurrects" them and gives them an extra gift with this new opportunity. Now the X-Men will be invisible to any electronic device, and the world will believe them dead, advantage that Storm, however painful the decision seems, will assume to face the numerous enemies of the X-Men and take a much more Aggressive and less reactive. In addition Rome gives them an extra gift: a mystical portal called Siege Perilous, which gives all who cross it the opportunity to "atone for their sins" and be reborn in life as a new person. Simultaneously, the New Mutants (separated from the X-Men from the Mutant Massacre), are found by Magneto prisoners of a creature known as the Ani-Mator. When escaping from his captor, Cypher, one of the group's members, is killed. When the team returns to the United States, they believe the X-Men have died. With Cypher and the X-Men allegedly dead, Magneto believes he has failed Xavier and decides to return to his criminal activities. At the same time, Archangel, of X-Factor is depressed and on the brink of suicide American Revolution Costumes
. The Marauders tore off his wings. It is then when he makes his debut the villain Apocalypse, a wicked and ancient mutant, who recruits him for his new team, the Four Horsemen of Apocalypse. Archangel becomes the Rider of Death. With this team, Apocalypse attacks New York City and faces X-Factor. X-Factor manages to defeat him and Arcángel manages to recover of the control of the villain. From then on, Apocalypse will become the main threat to X-Factor.