Joss Whedon has opened up as to why he chose Ultron for the next villain in the Avengers franchise.
Whedon stated that he actually wanted to debut Ultron, who appeared first in an issue of the Avengers in 1968, in the first smash-hit movie in an interview with Total Film: "I was pitching Ultron before I took the job on the first movie. I was like, ‘I don’t know if I want to do this, but for the second one, you should totally do Ultron’. Because he’s been a thorn in their side as much as any other character over the years and particularly back in my history.”
“He was great. He’s somebody who can juice things up and he’s a real problem for the Avengers. That’s not always easy to find. It’s not like the Vulture is really going to give them a hard time for 20 minutes,” Whedon stated. Whedon also revealed that ScarJo’s Black Widow character will have a much bigger role in the highly anticipated sequel: “Natasha (Black Widow) is a huge part of the sequel because you do want to concentrate on the people who don’t have their own franchises,” he stated.
Unfortunately, we have quite a while to wait for the next installment, as The Avengers: Age of Ultron won’t hit theaters until 2015.