The countdown to The Avengers is on, and ET is behind the scenes of the hugely anticipated superhero extravaganza on the top-secret set. Plus, we have a sneak peek at the brand-new trailer, dropping tomorrow!

For the first time ever on the big screen in The Avengers, Marvel Comics characters Iron Man (Robert Downey Jr.), Captain America (Chris Evans), The Hulk (Mark Ruffalo), Black Widow (Scarlett Johansson), Thor (Chris Hemsworth) and Hawkeye (Jeremy Renner) are united as one, courtesy of Nick Fury (Samuel L. Jackson) of S.H.I.E.L.D.

The 'Avengers' Have Arrived

It's a super-combustible mix of clashing egos and personalities onscreen, and Downey tells ET's Mark Steines that his character, Tony Stark, enjoys messing with Ruffalo's Bruce Banner just to see him go green.

"Wait until you see the movie," says Downey with a smile. "It's kind of my primary focus."

The Super 'Avengers' Gallery!

The explosive, action-packed movie follows the daring recruitment of the crack team of heroes in order to pull the world back from the brink of disaster from an unexpected enemy.

Directed by Joss Whedon and also starring Tom Hiddleston and Stellan SkarsgÄrd, The Avengers flies into theaters and IMAX on May 4 -- and look for the new Avengers trailer Wednesday on!

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