Although we've known quite a bit about what to expect from 'Avengers: Age of Ultron' for a while now thanks to this thing called The Internet and to the rather excellent Marvel panel at Comic-Con 2014, tonight Marvel has finally revealed the official plot synopsis for the upcoming superhero super-sequel -- among the details you'll find a little nugget about Vision, a new character, but one with which fans will already be familiar.

We got a chance to see some pretty intense footage at Comic-Con 2014, which promises that the Avengers will indeed find themselves up against a formidable threat when they face Ultron in the upcoming sequel.

Here's the official synopsis, from Marvel:

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.

As we'd previously learned, Paul Bettany voicing Vision isn't a coincidence -- Ultron is a hyper-intelligent creation of Tony Stark gone awry, and Vision is a creation of Ultron. We'll just leave it at that.

'Avengers: Age of Ultron' hits theaters on May 1, 2015.

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