The one-and-a-half minute scene from the upcoming superhero film features Nick Fury (Jackson) discussing the nature of "real power" with villain Loki (Hiddleston).
Loki appears to be in a locked chamber as Maria Hill (Cobie Smulders) looks on from a monitor.
Watch the clip below (courtesy of MSN):
Director Joss Whedon recently revealed that The Avengers' DVD and Blu-ray sets will have around 30 minutes of extra footage.
The Avengers is released in UK cinemas on April 26 and in the US on May 4.
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Watch a trailer for The Avengers below:
