The X-Men are shaken to the core by the fallout from the Battle of the Atom event! Kitty Pryde is particularly affected, and her faith in Wolverine's Jean Grey School is eroded. With her students gone, what is Kitty to do? Meanwhile, X-23 is back, joining the All-New X-Men and.kissing Cyclops? What does this mean to Jean Grey? When Jean and X-23 are forced to team up against a mysterious force, she had better figure it out fast! Plus: a celebration of the X-Mens 50th Anniversary. Collecting: All-New X-Men 18-21, A+X 18, X-Men: Gold