When the mutant-hunting Marauders target the peaceful, sewer-dwelling Morlocks for annihilation, Marvel's heroes must attempt to stop one of the most shocking and violent acts of evil they have ever witnessed. But how will the X-Men, the New Mutants, X-Factor, Power Pack, Daredevil and Thor react when they realize that for all their strength and powers, they may already be too late? And what will happen when they find themselves next in the crosshairs?
The X-Men descend into the Morlock tunnels to save as many Morlocks as they can -- but when several team members suffer crippling injuries at the Marauders' merciless hands, it may be all they can do to get out alive. And while Wolverine plans to avenge those they couldn't save, Psylocke fights a running battle with the Marauders' most dangerous member: Sabretooth.
X-Factor is pulled into the battle when thier young ward, Rusty Collins, flees into the tunnels. But what began as a rescue mission becomes a bloodbath, as X-Factor must battle Freedom Force, Marauders, Morlocks and their own beleaguered reputation to save their friends -- and Angel suffers an injury that will quite literally change him forever.
When the mighty Thor becomes embroiled in the massacre, he seeks righteous vengeance against those who would slaughter innocents. However, he suffers a serious setback when Hela, the goddess of death, unexpectedly hobbles him with a spell of weakness and vulnerability. Can Thor survive long enough to save X-Factor's Angel, or will the Marauders prove that even a god can die?
Plus the New Mutants get their first real glimpse of horror when they must perform triage for the Morlock survivors; Power Pack proves their courage when they face off against the Marauders to save a friend; and Daredevil takes on Sabretooth alone. The most shocking comics event of 1986 is finally collected in one blood-soaked hardcover -- and for Marvel's mutants, nothing will ever be the same.
Collects Uncanny X-Men #210-214, X-Factor #9-11, New Mutants #46, Thor #373-374, Power Pack #37 and Daredevil #238.