Marvel releases a deleted scene featuring a very different opening for the Avengers movie.
Source: Marvel's The Avengers Deleted Scene 2
The deleted opening shows a different tone from the one we eventually see. It features Maria Hill (Cobie Smulders) recalling the events from recent days.
This clip, along with others, will be available on the upcoming Avengers Blu-ray starting September 25, 2012.
BONUS: Another clip from the Blu-ray"