With Marvel's big Comic-Con announcement regarding their Captain America and Thor movies, and Joss Whedon's Avengers initiative, IGN takes a look at the steps Marvel Studios will take - and have already taken - to link their film worlds together before The Avengers assemble in theatres.
The Marvel Universe, on the comics page, is a very dense, very rewarding, tapestry of heroes and villains, of Secret Invasions and Civil Wars. With so many links and characters connected to one another, it's hard to sort out for seasoned fans of the Marvel books.
Now, Marvel is trying to do on the big screen that which they do so well on the page: Unite the movie worlds they create and build a universe out of those individual franchises.
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