After the prison's destruction and his band is separated, Rick and Carl search for shelter in a nearby town and reunite with surviving friends. Rick's physical and mental state begin to unravel, while Carl grows increasingly independent and apathetic. They eventually manage to reunite with their other survivors and end up at Hershel's farm. Three new people arrive and inform the group that they are on a mission to Washington D.C. to cure the plague. Rick's band decides to join their journey...