Volatile CIA agent Carrie Mathison investigates and ultimately becomes obsessed with returned POW marine Nicholas Brody, who may or may not be an al-Qaeda-trained terrorist. Brody struggles to resume his domestic life with his wife and two children whom he barely knows. Saul tries his best to support his bipolar protégé while pursuing leads of his own and trying to hold his crumbling marriage together.

Liam wakes from a car crash with no memory of who he is. As he makes his way into town to look for help, he finds only dead bodies, all with strange pale eyes. Liam's first assessment is that a virus is present in the air, but he soon discovers the horrible truth: anyone who comes within a 50-foot radius of him dies instantly.