In Season 3 of the AMC zombie drama, Rick (Andrew Lincoln) and his band of survivors finally find some shelter from life on the road. There are only two problems with their sanctuary: It’s a prison; and it’s infested with walkers. As the group struggle to lock it down and make it into a place where they can live safely, Lori (Sarah Wayne Callies) grows closer to giving birth, and her pregnancy storyline comes to a head in the harrowing episode “Killer Within.” Meanwhile, Andrea (Laurie Holden) and newly introduced comic-book favorite Michonne (Danai Gurira) travel to the heavily fortified town of Woodbury, run by the enigmatic Governor (David Morrissey), a man harboring dark secrets. In other events, Rick is reunited with Morgan (Lennie James); Glenn (Steven Yeun) and Maggie (Lauren Cohan) grapple with romance in a world overrun by zombies; and tensions build toward a climactic battle between Rick’s group at the prison and the Governor and his soldiers from Woodbury.