'Avengers 2': Get To Know The Newest Team Member

Aaron Taylor-Johnson has officially signed on to play Quicksilver, and we've got everything you need to know about the superhero.

After rumors that he was up for the role of Quicksilver bubbled up over the summer, Aaron Taylor-Johnson has finally signed on to "Avengers: Age of Ultron," as one half of a super sibling duo.

According to Latino Review, Taylor-Johnson joins Elizabeth Olsen, who is said to have finalized a deal as Scarlet Witch in the upcoming sequel to 2012's mega hit.

From the way Joss Whedon describes the brother-sister team, the director seems excited to include them in the superhero fun. So, before we're formally introduced to Taylor-Johnson as a hero with actual powers, let's get to know a little more about Quicksilver.

Bad Beginnings

Before he formally joined the Avengers in their second iteration — which also featured Captain America, Scarlet Witch and Hawkeye — Quicksilver got his start as a member of the Brotherhood of Evil Mutants, which (you shouldn't be surprised) is a team of bad guys lead by Magneto. Slowly, the X-Men realized that the brother and sister were not evil, leading Captain America to recruit them for the Avengers.

Runs Fast, Thinks Fast

As central as Quicksilver's speed is to his identity as a superhero, the power also shapes his personality. Not only does he run at higher speeds, but he thinks at that pace as well, often leaving those around him in the dust, both physically and mentally. This causes him to often be impatient with the more normally paced heroes around him.

Son of Magneto

Did we mention that Quicksilver's dad is famous? That's right, the most notorious mutant around, Magneto, is the father of Quicksilver and Scarlet Witch. He was the original reason why they joined up with the Brotherhood, but they eventually came to learn that it was their dad who was the real bad guy. But don't think that just because the son of Magneto will be in "Avengers: Age of Ultron" that the man himself will make a cameo. Fox still owns the rights to that character ... and movie studios aren't very good at sharing.

Seeing Double

No, movie studios aren't very good at sharing ... except when there's some legal gray area. Because of Quicksilver's history with both the X-Men and the Mutants, both Fox and Marvel Studios can lay claim to him for film adaptations. Soon after Whedon announced that he was adding the brother-sister duo, Bryan Singer, director of "X-Men: Days of Future Past," announced that Quicksilver would also be appearing in his film, played by Evan Peters of "American Horror Story."

"Avengers: Age of Ultron" opens in theaters on May 1, 2015.