"There was a period where we did discuss a third act that revolved around the Madbomb from Cap mythology. It didn't have anything to do with Civil War, and if we couldn't get Downey - in the very, very early conversations before we nailed him - somebody pitched the idea of a third-act that revolved around the Madbomb, which makes people crazy. It almost like zombifies them - but not literally. The charm of the Madbomb is that you turn hordes of people into berserkers. That was the physical challenge that Cap and company would have had to face."
"Somebody you know has turned into a zombie and now you have to fight them. And there would have been the emotional component of that."