Why Tony Stark Isn't The Only Avenger Responsible For Ultron

As the only member of The Avengers with a good deal of experience working in the field of robotics and war machines, Robert Downey Jr.'s Tony Stark found a lot of fingers pointing at him when it was announced that Ultron would be the villain of The Avengers 2 and that Hank Pym (the evil robot's creator in Marvel Comics) would not be featured in the movie. It turned out that this was a true assumption, as Iron Man will have a big role in introducing the peacekeeping-machine-gone-wrong to the worl...