San Diego Comic-Con began as a humble gathering, conceived by Shel Dorf and a group of comic book fans in 1970. Held at the U.S. Grant Hotel, the initial convention hosted about 300 attendees who shared a passion for comics, science fiction, and fantasy. The foundation of comic conventions was established through a diverse program that included panel discussions featuring comic artists, film screenings, and a small exhibit hall filled with vendors. By showcasing both comics and various aspects of pop culture, it offered a unique opportunity for fans to engage with creators and each other.

The inaugural Comic-Con included notable creators such as Jack Kirby and Robert Kanigher who discussed their projects, creating an intimate environment for fans to interact. Over the years, the convention would evolve, expanding from a single day event to a sprawling, multi-day showcase held annually, filling the San Diego Convention Center. This miniature celebration of fandom grew in scope and reach, creating a blueprint for similar conventions worldwide while providing a voice for various genres within the wider entertainment landscape.

The festival's eclectic mix of comic books, anime, movies, and cosplay drew increasing media attention, establishing San Diego as a nexus for pop culture. The growth of Comic-Con mirrored the rising prominence of geek culture within mainstream society. Attendees began traveling in unprecedented numbers to revel in their shared interests, solidifying Comic-Con as the premier event for fans. Over the decades, it has introduced numerous trends and influenced a broad range of media, marking it as a cultural phenomenon.