With the buzz around Marvel's 'The Avengers' reaching a fever pitch and the first reviews starting to hit ahead of the film's May 4th release (all positive, from what we've seen so far), now might be a good time to reflect back on some of the many casting rumors to reflect on a very different 'Avengers' movie.

Over the course of several years, as Marvel set its cinematic plans in motion and began developing films like 'Iron Man,' 'Thor' and 'Cap