The vectors attack and take Peter's body; Walker is held prisoner by Sutton after the true nature of Sutton's relationship with Hatake is revealed.

Secrets come to the light and unlikely alliances are established; at the same time, Alan and Walker take on a dangerous mission to destroy what's left of the NARVIK virus.

Alan and Julia travel to an abandoned satellite station in a last-ditch effort to call for help. Once there, they come across the truth behind Hatake's plan and Julia's condition. Meanwhile, Dr. Jordan makes a startling discovery of her own, which could mean a cure for cancer.