Marvel revealed two more superheroes, QuickSilver and Scarlet Witch, in its latest trailer for theAvengers: Age of Ultron. For those wondering where the allegiance of the superhero siblings lie, the trailer shows that they stand firmly on the side of the Avengers in the upcoming movie.

Aaron Taylor-Johnson takes on the role of Quicksilver, a mutant with superhuman speed. Elizabeth Olsen plays the part of Scarlet witch, Quicksliver's mutant twin sister who has the ability to warp reality and the gift of magic.

In the trailer, the twins state their allegiance to the Avengers by taking a stand when given a choice.

"If you step out that door, you're an Avenger," says Haweye (Jeremy Renner) in the trailer.

That statement is followed by Scarlet Witch stepping outside with a Yolo look in her eyes and the next scene shows Quicksilver making quick work of some Utlron robots.

The trailer also shows plenty of action involving the original Avengers cast: Black Widow, Captain America, Hawkeye Hulk and Iron Man. 

Accompanying the latest trailer, Director Joss Whedon talked about what Quicksilver and Scarlet Witch bring to the Avengers.

"Besides the fact that I grew up reading about them, and they're in the DNA of the Avengers, I was really important for me to have people who would change the game emotionally and stylistically,"said Whedon. "Their powers are completely different and so, through them we get to see things differently."

For example, he now gets to slow down sequences of the film to show off Quicksilver's speed, Whedon said. Previously, there wasn't much of a reason to use that style. 

As far as the Avengers playing nice with one another, Whedon said that's what people want to see. However, they also want to see them not getting along at times.

In the trailer, Iron Man, Tony Stark, shows a little sass in stating that he isn't the boss. He merely pays for everything, he says. In another scene, Thor flips up Captain American's shield and uses his hammer to bat it through a field of bots.

"What we find is, they can get along great — they're a team," said Whedon. "But it's a thin wall between that and chaos. And they do get torn apart a little bit."

When asked if the movie will show off other Marvel characters that haven't been revealed yet, Whedon simply said "yes."

The Avengers: Age of Ultron hits theaters on May 1. Check out the latest trailer for Avengers: Age of Ultron below: 

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