As fans prep for the biggest Marvel summer movies yet-'Thor' and 'Captain America: The First Avenger'-Wizard goes inside Marvel Studios, tracking the company's success from its humble beginnings with just a few execs and a library of 2,000 amazing characters to today as the God of Thunder hammers his way into the mainstream. DC's not left out this summer either, thanks to Ryan Reynolds as Green Lantern, but does the new flick fly high or is the franchise already losing altitude? And where in the world is Brian K. Vaughan? After wrapping high-profile hits Y: The Last Man and Ex Machina, the former 'Lost' writer dropped off the map. We plugged in our GPS and tracked him down. We also break into the comic vault and sit down with 25 of today's top creators to talk about the first comic book they ever read and how it changed their life.