The second trailer for the highly anticipated superhero sequel AVENGERS: AGE OF ULTRON just exploded online, giving us a closer look at the colossal fight between Hulk and Iron Man’s Hulk-Buster.

The Marvel Studios film, directed by Joss Whedon, stars Chris Hemsworth, Chris Evans, Robert Downey Jr., Scarlett Johansson, Mark Ruffalo, James Spader, Andy Serkis, Samuel L. Jackson, Jeremy Renner, Cobie Smulders, Elizabeth Olsen, Aaron Taylor-Johnson, and Tom Hiddleston.

AVENGERS: AGE OF ULTRON will be released in theaters on May 1st, 2015.

When Tony Stark tries to jump-start 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 a global adventure.