Jeremy Renner has been announced to portray Hawkeye in "The Avengers", but he could show up as the character earlier in "Thor". A source who has seen an early cut of the May 6, 2011 release tells TheWrap that the bow-and-arrow-carrying hero indeed appears in the film, but refuses to elaborate on the context of his appearance or when the cameo will occur.
This is, however, won't be considered as a big surprise for Marvel has been known for its habit of introducing an Avenger member in another character's film. Samuel L. Jackson's Nick Fury showed up at the end of "Iron Man", while Thor was introduced in "Iron Man 2" as his hammer was featured at the end credits.
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