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The countdown is on... Marvel's The Avengers flies into theaters and IMAX on May 4, and only ET can show you glass-shattering, explosive new scenes from the movie, plus plot insights and backstage moments with the stellar cast. Watch the video!

Video: At the Big 'Avengers' Hollywood Premiere

Bringing together Marvel Comics favorites Iron Man (Robert Downey Jr.), Captain America (Chris Evans), The Hulk (Mark Ruffalo), Black Widow (Scarlett Johansson), Thor (Chris Hemsworth), Hawkeye (Jeremy Renner) and Nick Fury (Samuel L. Jackson), The Avengers finds the superheroes coming together and learning to work as a team to defend the world from the brink of disaster, courtesy of Thor's adopted brother, Loki (Tom Hiddleston).

Video: Heroes 'Geek Out' on 'Avengers' Set

Watch ETonline for more Avengers excitement!