Andrew Lincoln as Rick Grimes, Danai Gurira as Michonne and Melissa Ponzio as Karen, in a scene from Episode 16, "Welcome to the Tombs" from Season 3 of "The Walking Dead." (AP Photo/AMC, Gene Page)

Andrew Lincoln as Rick Grimes, Danai Gurira as Michonne and Melissa Ponzio as Karen, in a scene from Episode 16, "Welcome to the Tombs" from Season 3 of "The Walking Dead." (AP Photo/AMC, Gene Page)