William Magnus was the brother of the metamutant superhero Magneto but had no superpowers of his own. Jealous of his brother, Will set about to exterminate all metamutants. One of his creations were the metamutant-hunting robots known as the Sentinels. One of the Sentinels' achievements was the slaughter of Magneto's team, the Brotherhood of Mutants. The Brotherhood were later recreated by Magneto as the robotic Magnetic Men. At some point, Will created a robotic wife named Jocasta and a subordinate named Black Vulture.
After destroying three Roxxon oil freighters and framing Aqua Mariner for the attacks, Magnus helped to split the Judgement League Avengers on metamutant lines. The imprisonment of Aqua Mariner soon led to the formation of the JLX. After stealing an Atlantean artifact known as the Serpents' Crown, Will located the sunken world of Atlantis, the home of all metamutants. Will used his Sentinels to attack the JLX, but Jocasta died in the process.
At some later point, Will received approval of the Armageddon Agenda in the US Congress, giving him the right to exterminate all metamutants in the world. Though he started with the JLX and X-Patrol, he was defeated with the help of Amazon.
Powers and abilities
While human, Will Magnus has had no special abilities aside from his great intellect.