About this season
X-Men, still grieving over the death of Phoenix (Jean Grey), are investigating a case of a missing mutant girl in Northern Japan. This leads them to a mysterious virus that turns mutants into monsters. U-Men and the Inner Circle want it.
Episodes (12)
1. The Return
6.0Aired 1 April 2011 • 23 min
When a young girl named Hisako Ichiki goes missing in northern Japan, her parents seek help in Professor Xavier, who calls on the X-Men to unite.
2. U-Men
5.2Aired 8 April 2011 • 23 min
The X-Men carry out an investigation that leads them to the U-Men, a group of mad scientists whose hideout contains a horrifying secret.
3. Armor
5.0Aired 15 April 2011 • 23 min
Hisako's mutant powers are weakened during a fierce battle between the X-Men and Todd, the U-Men's mad scientist.
4. Transformation
5.0Aired 22 April 2011 • 23 min
The X-Men are put at risk of secondary mutation when the Blackbird is attacked by a bat-like creature showing dangerous signs of Damon-Hall Syndrome.
5. Power
5.0Aired 29 April 2011 • 23 min
Emma allows Professor Xavier to read her mind and reveal her thoughts after Cyclops opposes her membership in the X-Men.
6. Conflict
5.2Aired 13 May 2011 • 23 min
An intense battle ensues when the X-Men are attacked by remnants of the U-Men after being forced to execute an emergency landing in the Blackbird.
7. Betrayal
5.2Aired 20 May 2011 • 23 min
Having defeated the U-Men, the X-Men come face to face with Yui Sasaki at her underground base, where she once ran a school for mutant children.
8. Lost
4.3Aired 27 May 2011 • 23 min
After falling ill with Damon-Hall Syndrome, Riko and Kaga attack the X-men's base, while Emma spies on a stranger in her diamond form.
9. Revelations
4.0Aired 3 June 2011 • 23 min
Revelations abound when it's discovered that Riko and Kaga were drugged by Yui and that Jun and Mastermind are one in the same.
10. Countdown
4.0Aired 10 June 2011 • 23 min
Mastermind's evil plans are frustrated as a fierce battle between the X-Men and the Four Pillars of the Inner Circle rages on.
11. Revenge
2.0Aired 17 June 2011 • 23 min
Despite Yui's attempts to suppress them, Takeo's powers continue to gain strength, causing reality itself to become more and more twisted.
12. Destiny
3.7Aired 24 June 2011 • 23 min
The X-Men mount an attack to bring down Professor Xavier's son, Takeo, before he destroys the world, putting an end to both mutants and humanity.