Professor Xavier, the mentor of the X-Men is forced to confront his past sins when his own son explodes into a destructive force, and Jean Grey turns to the dark side, forcing the team to strike down one of their own in order to save themselves and the world. The death of one of their own leaves the remaining X-Men struggling to deal with the loss. And even before a moment of silence can pass, the mysterious Mr. Sinister arrives, intent on giving...

When Lorna Dane accidentally commits murder when her powers go out of control, Emma Frost feels forced to hand her over to S.H.I.E.L.D., forgetting that there's only one cell capable of containing that amount of magnetic power and it already has another occupant.