What about the one I posted earlier? In the last poster, I wanted to set the three Avengers led by Tony Stark (because he's the only one from our XXIst century reality - Thor is from Asgard, and Cap is from the past), standing against the Hulk (manipulated by Loki, or just very angry). As some of you suggested, I like this plot for the first Avengers movie : Avengers vs. Hulk (and Loki?).And then, for the second and third movies, bring the Krees and the Skrulls. Thank you all for your critics.