7 signs America has gone crazy for ‘The Walking Dead’ by Colleen Kane @FortuneMagazine October 11, 2015, 8:41 AM EST E-mail Tweet Facebook Linkedin Share icons The tale of those who survive after the dead have become walkers is a phenomenon that just won’t die. It keeps creating more and more iterations of itself. The first graphic novel in “The Walking Dead” ongoing series was published in 2003. HBO and NBC both passed on “The Walking Dead” television series before AMC claimed its golden-egg-laying goose. Since it first aired in 2010, AMC’s blockbuster, post-apocalyptic zombie show, “The Walking Dead,” has become a record-breaking hit, holding the number one spot for ages 18-49, and the most popular basic-cable drama ever. The resulting zombie fever has spawned two successful TV spinoffs, several best-selling books, webisodes, games, merchandise, tourism and more — each success fueling the other. So in dread-filled anticipation of the TV’s show’s sixth season premiere on October 11, Fortune takes a look at all of the cultural offshoots.