The X-Men confront their greatest threat yet when one of their own, Jean Grey, begins to lose control. While on a space rescue mission, Jean narrowly escapes death after being struck by an unknown cosmic force. Upon her return to Earth, this force amplifies her powers to unimaginable levels but also destabilizes her mind, pushing her to the edge. As Jean grapples with her new, overwhelming abilities, the X-Men face a dual crisis: they must try to save her from herself while also fending off alien forces determined to exploit her powers to dominate the galaxy. With Jean’s life hanging in the balance, the team must unite to protect her and the world from the destructive potential of her new, uncontrollable strength.