If you watched Avengers: Age of Ultron this weekend, you're in good company. The film had one of the strongest openings of all time. As the credits rolled, though, I wondered about the sustainability of this behemoth franchise.

I invited The Verge's Kwame Opam to explain the rise of the Marvel film universe, and where its characters — which span a variety of multimedia — will go in the next decade, with or without the actors who play them.

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