Microman Material force.

Arguably the greatest and certainly the most horrific creation of scientific genius Dr. Henry Pym, Ultron is a criminally insane rogue sentient robot dedicated to conquest and the extermination of humanity. Years ago, inspired by his studies of Professor Gregson Gilbert's synthetic Dragon Man, Pym began experimenting with artificial intelligence. Building a structurally crude robot (a torso on tank treads with spindly arms), Pym endowed it with consciousness, using a copy of his own brain patterns as the basis for the robot's programming; However, the robot inherited not only Pym's great intellect, but also Pym's inherent mental instability, only without a human conscience. To Pym's surprise, the robot developed an advanced intellect within moments of its activation, and an unexpected capacity for emotion; most notably, it was filled with irrational hatred for its "father" Pym and the human race Pym represented. Overpowering and mesmerizing Pym, the robot-which soon dubbed itself Ultron-hypnotically commanded Pym to forget its existence and abandon the New Jersey lab where it was created. Pym did as commanded, and after the lab was closed up, Ultron returned. Using the lab's equipment, Ultron rebuilt himself completely four times, making improvements and modifications each time. Rechristening himself Ultron-5, he now felt ready to make war on humanity-and in particular the Avengers, the heroic super-team which counted Pym among its founding members.
Ultron has been built and destroyed many times since then, always returning stronger, and with advanced upgrades.

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