the walking dead season 2

While scavenging supplies along a highway, Carol Peletier's daughter, Sophia, is pursued by a walker and separated from the group, and Carl is accidentally shot, forcing the survivors to stay on the nearby farm of veterinarian Hershel Greene. Hershel saves Carl's life, and in the group's attempt to co-exist with Hershel's family, secrets and disagreements lead to rising tensions. In addition, Rick learns of Lori's former affair with Shane and her newfound pregnancy, creating a rift between Rick and Shane.

A hidden collection of walkers - mainly friends and family of Hershel's but including Carol's missing daughter (which is unknown by Hershel) - is discovered in a barn and eventually released by an agitated Shane, who compels the group to eliminate the threat. Shortly thereafter, an encounter with a hostile group of survivors results in a shootout and the torture of a prisoner as they react to the new threat. Shane unilaterally decides to kill the prisoner without the group's knowledge. In an attempt to take over leadership, an unhinged Shane lures Rick away to murder him but is himself killed. The gunshots attract a horde of walkers who overrun the farm, forcing the group to scatter and regroup. Rick's leadership is questioned but solidified, and he reveals what he learned at the CDC: everyone is infected and will reanimate after death even if they aren't bitten by a walker.