Isolation

"Isolation" is the third episode of the fourth season of the post-apocalyptic horror television series The Walking Dead, which aired on AMC on October 27, 2013. The episode was written by Robert Kirkman and directed by Dan Sackheim. The situation at the prison worsens, as the virus infects more inhabitants, and the survivors try to figure out how to deal with the situation. Meanwhile, the group is confronted with a possible traitor, after Tyreese (Chad L. Coleman) discovers the murder of two infected individuals. Plot In the inner courtyard, Tyreese explains to Rick Grimes, Carol Peletier, and Daryl Dixon how he found the burned corpses of his girlfriend Karen and friend David. An enraged Tyreese demands that Rick find the killer; when Rick and Daryl try to calm him down, he turns violent and begins to attack them. During this, Rick flies into a rage and badly beats Tyreese before Daryl pulls Rick off. After bandaging Rick's hand, Hershel Greene and the rest of the prison's council decide to quarantine those who are sick in Cell Block A and separate the elderly and the children. Tyreese's sister Sasha, Lizzie the prison's doctor, Dr. Caleb Subramanian, and Glenn Rhee are among those who contract the virus and are forced to enter quarantine. Hershel suggests that they could search a veterinary college for medical supplies, and Daryl, Michonne, and Bob Stookey volunteer to retrieve the medicine.