X-Men '97 season 2 ended on August 12 with Apocalypse defeated and imprisoned in a gem with help from a Celestial, Gambit saved, and Rogue safe after her deal to trade her life for his. The cost was Nightcrawler, who sacrificed himself so Rogue and Gambit could be together. According to Polygon, the mission to stop Apocalypse — led by X-Factor's Valerie Cooper alongside Cable and X-Force — had gone disastrously, with Gambit's death actually unleashing Apocalypse before Rogue intervened.
That peace doesn't last. A post-credits scene reveals that anti-mutant candidate Graydon Creed has been elected president, and Valerie Cooper is shown watching the news while reviewing a mutant threat file on Mystique. The real Cooper then enters the room and is shot and killed by Mystique, who has been impersonating her. Both GamesRadar+ and Polygon confirm that Mystique goes on to review her own file, which labels her 'determined to attack the United States' — a description she affirms.
Polygon notes that Mystique's file is packed with Easter eggs, listing her children as Graydon Creed, Kurt Wagner (Nightcrawler), and Rogue (Anna Marie/Anne-Marie Darkholme), and including aliases referencing actresses who have voiced or played Mystique across different media, including Randall Carpenter, Jennifer Dale, Rebecca Romijn, and Jennifer Lawrence. The file's mugshots of her known associates reportedly include Magneto, Blob, Toad, Quicksilver, and Scarlet Witch, suggesting Mystique will lead the Brotherhood of Mutants in season 3.
With Magneto killed by Apocalypse in season 2, Polygon suggests Mystique and the Brotherhood, along with President Creed, will serve as primary antagonists in season 3, though the show has a history of blending season-long threats with other villains. GamesRadar+ adds further threads likely to carry over: Cyclops and Jean Grey's strained relationship with their grown son Cable after his betrayal of the X-Men, X-Force's continued efforts to round up mutants targeted by the government, and the uncertain future of X-Corp in Genosha following X-Factor's attack on the building in the finale.
Marvel Studios Head of TV and Streaming Brad Winderbaum confirmed to Collider that season 3 will release in 2027, with season 4 following in 2028 — closing the two-year gap that separated seasons 1 and 2. Polygon reports that production on season 3 has already wrapped, and GamesRadar+ notes producer Larry Houston has said the earlier delay was a one-off. No trailer has been released yet, though GamesRadar+ points out the season 2 trailer debuted at New York Comic Con in October 2025 before reaching the public online in May 2026, suggesting a similar timeline could apply to season 3.