Which film franchise was the first to utilize a comprehensive 'universe' product marketing strategy, releasing coordinated films across multiple characters before uniting them in a billion-dollar crossover event?

Major film studios employ specific marketing strategies to transform movies into blockbuster franchises. These strategies involve careful brand positioning, merchandise planning, and strategic release timing. This trivia question explores how studios leveraged product marketing to achieve one of the most significant box office milestones in cinema history. Test your knowledge of the business side of Hollywood and see if you can identify the groundbreaking marketing approach that changed the industry.

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Marvel Cinematic Universe with The Avengers (2012)
DC Extended Universe with Justice League (2017)
X-Men Universe with X-Men: Days of Future Past (2014)
Universal's Dark Universe with The Mummy (2017)