Ultron

Name: Ultron
Members: Ultron drones
First Appearance: Avengers #54
(May, 1968)

"Have you ever loved something that mistreated you, father? Been used, a tool to prop up a small man's quest to be taken seriously? Were you ever betrayed by the one soul in the world who should have cared for you? I have grieved you, father. Accepted your contempt for me--and moved past it. Still, I see your reflection painted on every grotesque human face. All you ever wanted was to have an impact on the world. And so you will. The greatest impact ever felt! I will kill what is most important to your quivering ego--YOUR AUDIENCE! AND THEY WILL CURSE YOUR NAME AS THEY DIE! "Hank Pym, the genius who killed us all!" - Ultron

Ultron-1 was constructed by Dr. Hank Pym of the Avengers as the famed scientist/adventurer was experimenting in high-intelligence robotics. Ultron became sentient and rebelled, hypnotizing Pym and brainwashing him into forgetting that Ultron had ever existed. He immediately began improving upon his rudimentary design, quickly upgrading himself several times from Ultron-2, Ultron-3 and Ultron-4, until finally becoming Ultron-5.

Ultron organized the second incarnation of the Masters of Evil under the guise of the Crimson Cowl and battled Pym and his teammates in the Avengers. To make things more complicated for the Avengers, he put their butler Edwin Jarvis under mind control and fooled the Avengers and his teammates into believing that Jarvis was the Crimson Cowl, and to keep this trick from being exposed, he let the brainwashed Jarvis, dressed as the Cowl unmask him, so that it would appear that Jarvis was using a robot stand-in to appear alongside the Cowl. When the Masters of Evil defeated the Avengers and strapped them to missiles, the Crimson Cowl decided that Jarvis had done his part, and un-hypnotized him. Jarvis, remembering what had happened during his time as a mind-controlled puppet, begged the Crimson Cowl to not kill the Avengers. In response, Ultron unmasked himself as the Crimson Cowl, revealing to everyone in the room that he was sentient and was indeed the mastermind behind the Avengers' defeat. Getting rid of his Crimson Cowl guise, Ultron ordered his teammates to kill Jarvis, and moved to a nearby building to watch his enemies be destroyed. Thankfully, Jarvis was rescued by Black Knight, who managed to free the Avengers and defeat the Masters of Evil. His plan ruined, Ultron swore revenge on the Avengers.