A mysterious female assassin terrorizes the X-Mansion, knocking out the X-Men one by one. Wolverine finds out that it is his clone, created by the Dr. Deborah Risman and raised without love by HYDRA, and she wants to kill him because she holds him responsible for her miserable life. Wolverine and X-23, as she is called, square off in a battle that Wolverine does not want to win.

As Jean's and Scott's graduation day approaches, Rogue suddenly leaves the mansion.

As all the monsters in the tomb attack, the teammates fight to survive and find a way out.

The X-Men are on vacation with Storm as their guardian. Amara falls ill while on the ship.

Wolverine finds his clone, X-23, who's trying to destroy Hydra, her creator, and the two team up to complete the mission.