When genetically enhanced mutant attacks ignite global panic, the already-controversial X-Men are placed under government surveillance by the Department of Damage Control—only to discover the chaos has been meticulously engineered by the enigmatic Mister Sinister, a geneticist obsessed with “perfecting” mutantkind. As public trust collapses and their own DNA secrets are weaponized against them, Cyclops and his team must stop a villain who sees them not as heroes, but as flawed prototypes in his design for evolution.