"[Cesar] Vallejo was at least metaphorically killed by fascist forces, in the sense that he wore himself out raising funds for the Republicans in the Spanish Civil War and got sick and died."

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I don't know that a movie like Doctor Strange couldn't have been the second or third film we made. I don't think we're doing anything in that requires past viewing, as opposed to Civil War which we wouldn't have done as the first or second movie because so much of that film is based on the pre-existing relationships between the characters.

— Kevin Feige