Invasion: Unnatural Selection

One of Russell's colleagues has been shot and killed by Underlay, and Russell questions the mysterious circumstances surrounding the shooting death. Meanwhile, Larkin becomes suspicious of an old boyfriend's motives after he invites her to visit his military base. Mariel worries that she hasn't been a good mother to her children since the hurricane, and she also wonders what Father Scanlon's intentions are when he invites her to attend his church's survivors' group.