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.
| Title | Air Date | Duration | ||
|---|---|---|---|---|
| Season 1 | Episode 1 | The Return - Joining Forces | 2011-04-01 | 25 min |
| Season 1 | Episode 2 | U-Men - Mutant Hunting | 2011-04-08 | 25 min |
| Season 1 | Episode 3 | Armor - Awakening | 2011-04-15 | 25 min |
| Season 1 | Episode 4 | Transformation - Secondary Mutation | 2011-04-22 | 25 min |
| Season 1 | Episode 5 | Power - Unity | 2011-05-06 | 25 min |
| Season 1 | Episode 6 | Conflict - Contested | 2011-05-13 | 25 min |
| Season 1 | Episode 7 | Betrayal - Shock | 2011-05-20 | 25 min |
| Season 1 | Episode 8 | Lost - Signs | 2011-05-27 | 25 min |
| Season 1 | Episode 9 | Revelations - From Behind the Scenes | 2011-06-03 | 25 min |
| Season 1 | Episode 10 | Countdown - Truth | 2011-06-10 | 25 min |
| Season 1 | Episode 11 | Revenge - End | 2011-06-17 | 25 min |
| Season 1 | Episode 12 | Destiny - Bond | 2011-06-24 | 25 min |
| Visual Effects | Takashi Okazaki | Character Designer |
| Production | Dan Buckley | Executive Producer |
| Production | Megan Thomas Bradner | Associate Producer |
| Production | Eric S. Rollman | Executive Producer |
| Production | Stan Lee | Co-Executive Producer |
| Production | Masao Takiyama | Executive Producer |
| Production | Jeph Loeb | Executive Producer |
| Production | Simon Philips | Executive Producer |
| Production | Joe Quesada | Co-Executive Producer |
| Production | Alan Fine | Executive Producer |
| Production | Taro Morishima | Producer |
| Production | Cort Lane | Producer |
| Writing | Warren Ellis | Story |
| Production | Fuminori Hara | Producer |
