featuring Maggie and Negan; The Walking Dead: Daryl Dixon, featuring the titular character; and an untitled series featuring Rick and Michonne. Series overview The Walking Dead takes place after the onset of a worldwide zombie apocalypse. The zombies, referred to as "walkers", shamble towards living humans and other creatures to eat them; they are attracted to noise, such as gunshots, and to different scents, e.g. humans. Although it initially seems that only humans that are bitten or scratched by walkers can turn into other walkers, it is revealed early in the series that all living humans carry the pathogen responsible for the mutation. The mutation is activated after the death of the pathogen's host, and the only way to permanently kill a walker is to damage its brain or destroy the body entirely, such as by cremating it. The series centers on sheriff's deputy Rick Grimes, who wakes up from a coma. While in a coma, the world has been taken over by walkers. He becomes the leader of a group of survivors from the Atlanta, Georgia, region as they attempt to sustain and protect themselves not only against attacks by walkers but by other groups of survivors willing to use any means necessary to stay alive. Season 1 (2010) When sheriff's deputy Rick Grimes of King County, Georgia, wakes from a coma, he discovers the world has been overrun by zombies ("walkers"). After befriending Morgan Jones, Rick travels alone to Atlanta before finding his wife Lori, son Carl, and his police partner and best friend Shane Walsh in the woods with other survivors. After being attacked by walkers at night, the whole group travels back to Atlanta to the Centers for Disease Control (CDC) building, but find from the sole remaining scientist that no cure yet exists for the pandemic. Season 2 (2011–12) Rick's group, searching for Carol's missing daughter, Sophia, takes shelter at a farm run by Hershel Greene. Tensions with Hershel's family worsen after it is discovered that he has a barn full of walkers: former friends and family members. Rick learns that Shane and Lori were romantically involved while he was in a coma, and that Lori is pregnant. Shane and Rick's friendship deteriorates, until Rick is forced to kill Shane in self-defense. The commotion attracts walkers to the farm, forcing Rick's group and Hershel's family to evacuate. Season 3 (2012–13) Eight months after fleeing the