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In response to negative feedback from early screenings, a complete overhaul of the final act was initiated, spearheaded by Brad Pitt and screenwriter Damon Lindelof. Paramount Pictures decided on a drastic rewrite, effectively discarding over an hour of footage to reconfigure the film’s conclusion. While this choice aimed to enhance audience experience, it left the sequel potential largely unexplored, instead providing a somewhat generic resolution through a vaccine mechanism.

Despite these setbacks, the film performed adequately at the box office, paving the way for talks of a sequel. Plans for World War Z 2 emerged, with the premise featuring a vaccine that would only last for 36 hours, introducing new tensions as global coalitions frayed under the stress of ongoing zombie complications.