Rick's group finds the prison has become a relatively safe base, but a close call with a stranger reminds them they can never let down their guard.

As the group faces a brand new enemy, Rick and the others must fight to protect the livelihood they worked so hard to create at the prison.

A group leaves the prison to search for supplies; the remaining members of the group deal with recent losses.

Assorted enemies pressure Rick and the group. The survivors and the prison may reach a breaking point.