Few details are known about the villain's role in the anticipated sequel helmed by Joss Whedon. Marvel hired Emmy award-winning actor James Spader to play Ultron in August 2013, and Whedon teased a bit of what was in store for the character.
"He’s got pain," Whedon said in August 2013. "And the way that manifests is not going to be standard robot stuff. So we’ll take away some of those powers because at some point everybody becomes magic, and I already have someone [Scarlet Witch] who’s a witch."
Marvel Studios head Kevin Feige elaborated on Whedon's Ultron description in October 2013, saying that the villain is "more than a voice role" and the studio planned to capture Spader's "face and his body to create a whole performance."
"He’s a very unique and incredibly exciting and unpredictable actor," Feige said of Spader. "And Ultron in the comics is a robot, but what’s cool about him in the comics -- and certainly how Joss Whedon is interpreting him for the movie -- is that he is much more than just a robot. That he's infused with much character. And I don't want to say too much, but you can imagine James Spader will be very dynamic in his portrayal of the character."
It's likely that fans can expect more details about "Avengers: Age of Ultron" during this year's Comic-Con International in San Diego, along with the rest of Marvel Studio's currently announced film schedule.
"Avengers: Age of Ultron" opens May 1, 2015.