Necrosha
2009Selene, the Black Queen, enacts a plan millennia in the making — using a mystical virus to resurrect millions of dead mutants as a techno-organic undead army, all to fuel her ascension to godhood on the cursed island of Genosha. X-Force leads the charge against a relentless tide of resurrected allies and enemies alike. A dark, horror-tinged event that forces the X-Men to fight their own dead.
5 core issues, 8 optional tie-ins/crossovers

Selene's plan is revealed; the transmode virus begins resurrecting dead mutants

X-Force scrambles to contain the undead mutant army

The team takes the fight to Genosha as Selene's power grows

X-Force assaults Selene's stronghold on Genosha

Selene achieves godhood — and X-Force must destroy her before she consumes everything
Tie-InThe New Mutants face resurrected versions of their dead friends
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Tie-InNew Mutants resolve their part of the Necrosha crisis
Tie-InResurrected mutants attack the X-Men on Utopia
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Tie-InLegacy team survives the onslaught of resurrected dead