We've been building up to the release of The Avengers for a while, but now the big moment is almost here! There are quite a few smokin-hot superheroes to keep track of in this movie, most of who have already appeared on the big screen before. If you haven't had the chance to see all the prequel movies, never fear — I've put together this guide to catch you up on what you need to know. And even if you've already seen 'em, allow me to refresh your memory.
