Which groundbreaking product marketing strategy did Marvel Studios pioneer that revolutionized how film franchises maintain audience retention between releases?

The film industry relies heavily on innovative product marketing strategies to turn movies into blockbuster hits. From teaser trailers to merchandise, the marketing campaign can often be as impressive as the film itself. Test your knowledge about the marketing techniques that helped propel certain films to extraordinary commercial success. Do you know which marketing innovation truly changed the game?

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Post-credits scenes teasing future films (first widely popularized in Iron Man, 2008)
Celebrity red carpet premieres with live streaming (first used for Spider-Man, 2002)
Limited edition collectible popcorn buckets (introduced with The Avengers, 2012)
Releasing director's commentary podcasts during theatrical runs (started with Thor, 2011)