At Comic-Con 2013, Joss Whedon appeared on stage at the Marvel to show a quick teaser trailer that revealed the title of 'Avengers 2' - 'Age of Ultron.' The Comic-Con crowd went nuts but for those who are unfamiliar with the "Age of Ultron" crossover event in the Marvel comic books, we present a quick primer on the upcoming supervillain in 'Avengers 2.' Who is Ultron? Let's find out!

Ultron was a creation of Dr. Henry Pym (Ant-Man) as he experimented with sentient robots. His creation was a little too successful and, inhabited with Pym's own brain waves, became self-aware. While he possessed his creators supreme intelligence, he lacked any of his compassion and conscience and almost immediately became fueled with a hatred for Pym. He rebuilt himself four times, becoming increasingly more powerful. He eventually recruited a group of Avengers villains to form the Masters of Evil.

In the "Age of Ultron" crossover event in the comic books, Ultron had rebuilt himself so many times, he was powerful enough to take over the world. The actual story involves a number of characters not in the current 'Avengers' movie universe (including Spider-Man, Wolverine and She-Hulk) and involves a decent deal of time travel, so we'll imagine it's just a launching point for the film, rather than a straight adaptation.

But what 'Age of Ultron' will need is the introduction of Henry Pym/Ant-Man prior to Edgar Wright's 'Ant-Man' film and Vision, a character created by Ultron. This is the time where we remind you that Vin Diesel has allegedly been dropping hints about discussing Vision with Marvel and could very well be a possibility.

Ultron's powers include the Encephalo-ray, which places victims into a death-like coma and allows him to manipulate their minds (possibly only to be activated at a later time). Like Iron Man, he also has a number of blasts and repulsors, as well as super strength and the ability to fly at supersonic speeds. His outer shell is composed as adamantium (the same metal fused to Wolverine's skeleton) and is virtually indestructible.

He is definitely one of the biggest foes of the Avengers and it's not surprising he's been added to the Marvel Cinematic Universe but perhaps surprising that it happened so quickly. Many assumed that 'Avengers 2' would focus on Thanos (and hints at the 'Guardians of the Galaxy' panel would indicate that Thanos is still very much a part of this universe) but when the title of your film is 'Age of Ultron,' you would have to think he will be the main villain and Thanos could be shifted to a larger part in 'Avengers 3.'

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