One of the most electrifying villains in the Marvel Universe, sorry ZZZaxxx. He has a long and storied history. But I will just do the highlights. Avengers 2 seems to be based off Ultron Unlimited
Ultron starts out as an experiment in artificial intelligence by Hank Pym, it quickly became self aware and hypnotized Hank into forgetting him.
His next notable appearance is as Ultron 5, who created The Vision using the body of the Original Human Torch, who was an android
Then there was Ultron 6 who went full adamantium, dual head carbs, and manual gearbox.
Ultron 8 wanting to love creates Jocasta who is based on his "mom" Wasp
Later Ultron 13 decides to give it another go kidnaps Mockingbird and uses her brain as a base for his new mate War Toy!!
Ultron makes a few more minor appearances, but his next big play is the one he is best known for. He recreated every past version of himself and invaded the country of Solernia. And killed every living thing
The Avengers went to stop them and fought hundreds of copies of Ultron, thank god they were just made of lesser nearly indestructible metals.
But even then it took Hank wielding Antarctic Vibnerium aka Antimetal to take him down.
When next seen Ultron takes on the female form of his mother Wasp. Only to be destroyed by the power of a Million exploding suns.
Ultron was next seen controlling then Phalanx, a techno organic race trying to infect all life in the universe. He was stopped by a bunch of assholes.
Then there was the Age of Ultron, which wasn't that good and involved a lot of time travel fuckery. But to summarize it, Ultron is gone and he ain't coming back.......yet.
What makes Ultron so dangerous is that he can never be defeated the same way twice. When Wonder Man shook his internal circuitry apart, the next version was made of solid adamantinum, to move he literally rearrange every molecule in his body to do it.
That and his motivations and attack methods vary from version to version. Thats what makes him so interesting, even thought he does have those traits being an evil robot that wants to destroy all humans. He is also very human himself, batshit crazy, but human still.
Essental reading
Avengers #54-#58
Avengers #66-#68
Avengers #157-#168
Secret Wars #1-#12
Avengers #19-#22
Avengers #212=#230
Annihilation: Conquest #1-#6
Thread dedicated to Wolf Swag and Ultron's dog Rex. RIP
Ultron starts out as an experiment in artificial intelligence by Hank Pym, it quickly became self aware and hypnotized Hank into forgetting him.

His next notable appearance is as Ultron 5, who created The Vision using the body of the Original Human Torch, who was an android

Then there was Ultron 6 who went full adamantium, dual head carbs, and manual gearbox.

Ultron 8 wanting to love creates Jocasta who is based on his "mom" Wasp
Later Ultron 13 decides to give it another go kidnaps Mockingbird and uses her brain as a base for his new mate War Toy!!

Ultron makes a few more minor appearances, but his next big play is the one he is best known for. He recreated every past version of himself and invaded the country of Solernia. And killed every living thing

The Avengers went to stop them and fought hundreds of copies of Ultron, thank god they were just made of lesser nearly indestructible metals.
But even then it took Hank wielding Antarctic Vibnerium aka Antimetal to take him down.
When next seen Ultron takes on the female form of his mother Wasp. Only to be destroyed by the power of a Million exploding suns.

Ultron was next seen controlling then Phalanx, a techno organic race trying to infect all life in the universe. He was stopped by a bunch of assholes.

Then there was the Age of Ultron, which wasn't that good and involved a lot of time travel fuckery. But to summarize it, Ultron is gone and he ain't coming back.......yet.
What makes Ultron so dangerous is that he can never be defeated the same way twice. When Wonder Man shook his internal circuitry apart, the next version was made of solid adamantinum, to move he literally rearrange every molecule in his body to do it.
That and his motivations and attack methods vary from version to version. Thats what makes him so interesting, even thought he does have those traits being an evil robot that wants to destroy all humans. He is also very human himself, batshit crazy, but human still.
Essental reading
Avengers #54-#58
Avengers #66-#68
Avengers #157-#168
Secret Wars #1-#12
Avengers #19-#22
Avengers #212=#230
Annihilation: Conquest #1-#6
Thread dedicated to Wolf Swag and Ultron's dog Rex. RIP