When Tony Stark and Bruce Banner try to jump-start a dormant peacekeeping program called Ultron, things go horribly wrong and it’s up to Earth’s mightiest heroes to stop the villainous Ultron from enacting his terrible plan.

Casting: Robert Downey Jr., Chris Evans, Chris Hemsworth, Mark Ruffalo, Scarlett Johansson, Jeremy Renner, Elizabeth Olsen, Aaron Taylor Johnson, Paul Bettany, James Spader, Joss Whedon and Kevin Feige talk