As one group leaves the prison in search for supplies at a local college, those who stay must deal with recent losses while preserving what remains.
New threats to the Prison survivors arise while the Woodbury population readies for a new danger.
After another loss, Rick struggles. Michonne remains suspicious of the Governor as he throws a party with a unique twist for the people of Woodbury.
As Herschel's life hangs in the balance, Rick and the others have to deal with the realization that they are not the only living people in the prison.
The last shot from the previous episode alerts a nearby zombie horde to the survivors. In the ensuing chaos, the group is fractured and loyalties questioned.
The secret of the Walkers in the barn is fully exposed and Shane forces a decision to be made about them. Herschel has given Rick an ultimatum that his group must leave.
Rick leads the group out of Atlanta. On the highway, they are stopped by a threat unlike anything they have seen before. The group searches for someone who has gone missing.