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Avengers: Infinity War and Avengers 4 are the culmination of a decade’s worth of Marvel movies. They also just so happen to be the last films on expiring contracts for the actors who’ve led the Marvel Cinematic Universe this whole time. That perfect storm of events has fans worried about the safety of their favorite heroes.

For screenwriters Christopher Markus and Stephen McFeely, the rules from Marvel Studios regarding character deaths were simple: there were no rules. No one was safe.

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