X-Men

After young Hisako Ichiki disappears in northern Japan, her parents turn to Professor Xavier, who enlists the X-Men to help locate her.

The X-Men investigate a series of strange occurrences and uncover the U-Men, a team of eccentric scientists whose underground lair holds a disturbing and dangerous secret.

During a confrontation between the X-Men and Todd, the U-Men's eccentric scientist, Hisako's mutant abilities are diminished.

The X-Men face a potential secondary mutation crisis when a mysterious bat-like creature attacks the Blackbird, exhibiting symptoms of the dangerous Damon-Hall Syndrome.

Emma Frost allows Professor Xavier to access her mind to prove her commitment to the X-Men after Cyclops questions her suitability as a team member.

The X-Men are forced to make an emergency landing in the Blackbird, only to be attacked by surviving members of the U-Men, leading to a fierce confrontation.

After defeating the U-Men, the X-Men confront Yui Sasaki at her underground base, the former site of a school for mutant children.

Riko and Kaga, afflicted with Damon-Hall Syndrome, launch an assault on the X-Men's base, while Emma, in her diamond form, surveils an unfamiliar individual.

The episode uncovers that Yui drugged Riko and Kaga, while also revealing that Jun and the Mastermind are the same person.

The X-Men clash with the Four Pillars of the Inner Circle in an intense confrontation that disrupts Mastermind's schemes.

Takeo's growing powers begin to distort reality, despite Yui's efforts to control them.

The X-Men launch a mission to stop Takeo, Professor Xavier's son, from carrying out a plan that would annihilate both mutants and humans.