Today Marvel Entertainment unveiled the third trailer for the upcoming Marvel Avengers: Age of UltronThe highly anticipated epic follow-up to Marvel’s 2012 The Avengers film is set to hit theaters on May 1.  When Tony Stark tries to jumpstart a dormant peacekeeping program, things go awry, and 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. Check out the all-new trailer here: