There's a really good chance that the summer's most anticipated movie will also be one of its best. Part of that has to do with the all-star team assembled here: Iron Man (Robert Downey Jr.), Captain America (Chris Evans), the Hulk (Mark Ruffalo), and Thor (Chris Hemsworth), all imported from their own (mostly) hit movies. But part of it also has to do with director, co-writer, and geek god Joss Whedon. Armed with a great story (Thor's evil brother Loki plans to wipe out the planet), a game cast, and total reverence for the source material, Whedon stages nearly every scene like it's a Big Moment.