Two teams of mutants. Two tales of tragedy. The vicious Marauders have already slaughtered the tunnel-dwelling Morlocks, and now they plan to kill Cyclops' estranged wife, Madelyne Pryor! And if that means taking on the X-Men, that's just fine with them! Meanwhile, Storm goes on a vision quest to find Forge...but she discovers the evil Adversary pulling their strings, and the X-Men will need to li