The Walking Dead takes place after the onset of a worldwide zombie apocalypse. The zombies, colloquially 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. Humans that they bite or scratch become infected and slowly turn into walkers as well.
The series centers on sheriff's deputy Rick Grimes, who wakes up from a coma to discover this apocalypse. He becomes the leader of a group of survivors from the Atlanta, Georgia region as they attempt to sustain themselves and protect themselves not only against attacks by walkers but by other groups of survivors willing to assure their longevity by any means necessary.
As the world grows more dangerous and Lori's pregnancy advances, Rick locates a potentially safe haven.
A life hangs in the balance; the group deals with a threat to their new surroundings.
After witnessing an accident, Andrea and Michonne are introduced to a new community of survivors. As conflicts arise with their new acquaintances, a decision must be made.
The group is severed, placing lives in jeopardy. Merle has a request for the Governor. Meanwhile the prison doesn't seem to be a place as secure as they thought.
Rick struggles after another loss. Michonne is suspicious of the Governor.
Michonne makes a decision about Woodbury; Glenn and Maggie go on a run; Rick struggles.
The Governor presses for information. A new guest arrives at the prison, forcing Rick's hand.
Andrea steps up when the people of Woodbury are thrown into uncharted territory. A new threat arises at the prison.
After the invasion of Woodbury by Rick’s group, Daryl and Merle are captured by The Governor. Rick decides the fate of Tyreese’s group.
As the group debates their next course of action, Rick wanders after a lost friend. After helping another group of survivors flee a group of walkers, Daryl and Merle begin to have second thoughts about leaving the prison. The Governor cedes leadership of Woodbury to Andrea and makes plans to punish those responsible for the chaos.
Rick and the group are forced to make a decision now that their safety is no longer guaranteed. Andrea feels uncomfortable now that Woodbury has become a police state.
Since they are outgunned against the Governor's forces, Rick undertakes a mission to get more weapons.
Rick and the Governor contemplate a peace treaty.
The Governor chases a fleeing dissenter; while the Governor is gone, a traitor tries to sabotage his plans.
Rick and the group are faced with a serious problem. If they want a truce with the Governor, they will have to make a huge sacrifice.