Learn more about the "Science Bros," Robert Downey Jr.'s Tony Stark and Mark Ruffalo's Bruce Banner in a new featurette for Avengers: Age of Ultron, in theaters May 1. Mark Ruffalo reveals that Tony and Bruce work very well together, while Robert Downey Jr. reveals why they created a "backup plan" in case Hulk gets out of control, the Hulkbuster armor. Executive producer Jeremy Latcham also reveals that the Hulkbuster suit is actually 20 feet tall, while showing footage of Hulk and Hulkbuster's massive fight in the middle of an African street.

Marvel Studios presents Avengers: Age of Ultron, the epic follow-up to the biggest Super Hero movie of all time. When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry and Earth's Mightiest Heroes, including Iron Man, Captain America, Thor, The Incredible Hulk, Black Widow and Hawkeye, are put to the ultimate test as the fate of the planet hangs in the balance. As the villainous Ultron emerges, it is up to The Avengers to stop him from enacting his terrible plans, and soon uneasy alliances and unexpected action pave the way for an epic and unique global adventure.

Marvel's Avengers: Age of Ultron stars Robert Downey Jr., who returns as Iron Man, along with Chris Evans as Captain America, Chris Hemsworth as Thor and Mark Ruffalo as The Hulk. Together with Scarlett Johansson as Black Widow and Jeremy Renner as Hawkeye, and with the additional support of Samuel L. Jackson as Nick Fury and Cobie Smulders as Agent Maria Hill, the team must reassemble to defeat James Spader as Ultron, a terrifying technological villain hell-bent on human extinction. Along the way, they confront two mysterious and powerful newcomers, Wanda Maximoff, played by Elizabeth Olsen, and Pietro Maximoff, played by Aaron Taylor-Johnson, and meet an old friend in a new form when Paul Bettany becomes Vision. Take a look at this featurette below, and stay tuned for more from Avengers: Age of Ultron as we get closer to the May 1 release date.