SEATTLE—As the Marvel Cinematic Universe expands to every movie theater in the world, the MoPOP Museum of Pop Culture (formerly Experience Music Project) swoops in this week with an exhibit that reminds fans where the heck these costumed heroes came from: the comics pages. Marvel Universe of Super Heroes, a massive, two-story exhibit, began its world-premiere run in Seattle on Saturday with a mix of incredible historical context and Marvel's strange, narrow focus within the MCU.