Season 1
The season follows former sheriff's deputy Rick Grimes, who awakens from his coma into a post-apocalyptic world filled with flesh-eating zombies, dubbed as "walkers". Rick goes on a search to find his family and to discover the origins of the walker virus.
Season 2
This season introduces the notable comic book characters Hershel Greene and Maggie Greene and is mainly set at the Greenes' farm. The season continues the story of Rick Grimes and his group of survivors as they continue to survive in a world filled with zombies.
Season 3
the season is set in both an abandoned prison and an active rural town of survivors. It introduces several notable characters from the comics, including The Governor, Michonne, Axel, and Tyreese. It also marks the return of Merle Dixon, Daryl's volatile older brother who went missing in season 1.
Season 4
Season four introduces the notable comic characters Abraham Ford, Eugene Porter, Rosita Espinosa, Bob Stookey, and Lilly, as well as the Chambler family, a modified version of the Chalmers family from The Walking Dead: Rise of the Governor tie-in novel.
Season 5
Season 5 follows the group of survivors led by former sheriff's deputy Rick Grimes as they face several threats from both humans and walkers in their search for finding a new place to reside. The group is also motivated by Eugene Porter's proposal to head to Washington, D.C. for a possible cure for the walker virus.