A very dark and grainy trailer for The Avengers has leaked onto the internet.
The first trailer for the Marvel film will be shown at the end of Captain America: The First Avenger, which opens on July 29.
Chris Evans' Captain America will join Hulk, Thor and Iron Man in the hugely anticipated superhero film.
Source have suggested to WorstPreviews.com that the trailer will also get shown during this week's Comic Con in San Diego.
Mark Ruffalo, Chris Hemsworth and Robert Downey Jr will all reprise their heroic roles, with other cast members including Scarlett Johansson, Jeremy Renner, Gywneth Paltrow and Samuel L. Jackson.
The Avengers is due for release on May 4, 2012.
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