Avengers, Assemble: Check Out The First Photos From Marvel's Age of Ultron

Elizabeth Olsen, younger sister of famed twins Mary-Kate and Ashley Olsen, is seen filming on location for "Avengers: Age of Ultron" on March 24, 2014 in Aosta, Italy.

She will play Scarlet Witch, a mutant who has the ability to alter probability.

Joining her is Aaron Taylor-Johnson who will play the mutant Quicksilver.

Quicksilver, is Scarlet Witch's twin brother and possesses superhuman speed.

The two will join Marvel's Jeremy Renner, who plays Hawkeye, along with the rest of Marvel's pantheon of superheroes.

Also seen on set was what is presumed to be a stand-in actor for Ultron.

Ultron, a robotic supervillain with artificial intelligence, has been speculated to be the key villain of the second Avengers movie.