Ultron

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First Appearance: Avengers #54Best Writer: Roy ThomasBest Artist: George Perez

Ultron is the creation of Henry Pym, and based on Pym's brain patterns. The robot gradually developed its own intelligence and rebelled, and almost immediately develops an Oedipus Complex, whereby it feels irrational hatred for his "father" Hank, and demonstrates an interest in Hank's lover Janet van Dyne, the Wasp. Rebuilding itself, learning how to turn itself on, and upgrading five times, Ultron then hypnotizes Pym and brainwashes him into forgetting that the robot had ever existed.

Ultron himself is the creator of Jocasta, whom he intended to be his robotic bride and invested with the brainwave patterns of The Wasp. Much like the Bride of Frankenstein, she spurned him. Taking a step further, she joined with The Avengers.

Ultron has upgraded himself numerous times, each time becoming deadlier, and has been a recurring nemesis for both The Avengers and Hank Pym, his creator.