The Avengers trailer debuted on October 11, setting off high-pitched screams of joy from many of the fans of the upcoming superhero epic.
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It was so loved, in fact, that it was downloaded more than 10 million times in the first 24 hours that it was available on iTunes, Marvel Studios announced. This shattered the iTunes site’s previous record for most viewed trailer in the site’s history.

The superhero ensemble film, which opens in theaters on May 4, 2012, features an all-star superhero cast, including Iron Man (Robert Downey, Jr.), Thor (Chris Hemsworth), Captain America (Chris Evans), The Incredible Hulk (Mark Ruffalo), Hawkeye (Jeremy Renner) and Black Widow (Scarlett Johansson). Nick Fury (Samuel L. Jackson) returns as the S.H.I.E.L.D. leader who will guide the world-savers in a battle against Loki (Tom Hiddleston).

The trailer gave fans the first longer-than-a-blink look at the weaponry and suits of the superhero pack, along with a peek into the interactions between the characters. Hint: Tony Stark is still a smart ass. (Source)