Brotherhood of Mutants

After several years of similar attacks, Magneto openly declared his plans to supplant humanity, generating anti-mutant hysteria and provoking the U.S. government to unleash giant Sentinel robots, which indiscriminately killed any mutant they found. The Brotherhood responded by kidnapping the President's daughter, threatening to kill her if another mutant was slain. She was rescued by Xavier's new students, the X-Men, and the grateful President halted the Sentinel hunts.

The disillusioned X-Man Cyclops defected to the Brotherhood, feeling that Xavier was currying favor with an enemy regime. In response to plans for British Sentinels, he helped the Brotherhood bomb the British Houses of Parliament and M16 building in London, though he tried to limit human casualties. The U.S.A. found the Savage Land and launched a massive Sentinel attack, but Magneto reprogrammed them and attacked Washington. The X-Men and his own son, Quicksilver, halted Magneto's genocidal plan. With Magneto believed dead, Quicksilver led a less murderous Brotherhood. When the X-Men were captured by Weapon X, the Brotherhood freed them; many of Weapon X's liberated mutant captives joined the Brotherhood. They freed sentient mutant animals and attacked financial institutions. Quicksilver called a cease fire, and held talks with the U.N.

Splinter groups such as the Acolytes broke from the Brotherhood and resumed terrorism. Asserting his authority, Quicksilver led the Brotherhood in disarming the nuclear arsenals of Pakistan and India. Certain followers such as militant animal evolutionary Prosimian remained dissatisfied, and, learning his death had been faked, they tracked down an amnesiac Magneto and restored his memories. Magneto promptly "purified" the Brotherhood by slaying the evolved animals who had rescued him. He re-launched the bombing campaign and gave humanity six months to surrender. Fearing their father's retaliation, Quicksilver and Scarlet Witch defected to the Ultimates. Based in the Citadel in the Arctic Circle, Magneto plotted to destroy the established world by reversing Earth's magnetic fields. Forge built a power boosting device, and other Brotherhood members stole art treasures and recruited more mutants. The X-Men thwarted this plan, Magneto was apprehended, and much of the Brotherhood dispersed. Some of the Brotherhood, Forge and Mystique, subsequently helped arrange Magneto's jailbreak. Magneto has informed his newest follower, Longshot, that he has no intention of reforming the Brotherhood.