While in a rescue mission in space, Jean escapes death narrowly when she is hit by a mysterious cosmic force. As soon as she returns home, this force not only makes her extremely powerful, but far more unstable. Wrestling with this entity inside her, Jean unleashes her powers in methods she can neither comprehend nor withstand. With Jean spiraling our of control, and hurting those she loves most, she begins to unravel the very fabric that holds the X-Men together. Now, with this family breaking apart, they have to figure out a way to unite – not only to save Jean’s soul, but to save our very planet from aliens who intend weaponize this force and rule the galaxy.