Joss Whedon's 'The Avengers' has already made upwards of $280 million overseas before even hitting US theaters. It's also a phenomenal film in this writer's opinion. Success of this kind, especially in the realm of superhero cinema, always gets the geek hive mind contemplating, and we couldn't help but wonder what a Joss Whedon Batman film would look like. Turns out, as some of you may already kn…