Third Avengers: Age Of Ultron Trailer Officially Released Online

Following their Twitter contest earlier today, Marvel Studios has released the third trailer for their upcoming super-team-up Avengers: Age of Ultron online.

Following a number of newly-released character posters and a new round of press, the trailer comes amid speculation about whether the company still has another big announcement up their sleeve for tomorrow.

You can check out the trailer below, along with the film's official synopsis.

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. Written and directed by Joss Whedon and produced by Kevin Feige, Marvel's Avengers: Age of Ultron is based on the ever-popular Marvel comic book series The Avengers, first published in 1963. Get set for an action-packed thrill ride when The Avengers return in Marvel's Avengers: Age of Ultron on May 1, 2015.