While Gene and Miles venture into Willoughby in search of allies, Monroe seizes an opportunity to surprise the Patriots. Meanwhile, Neville's political maneuverings put him and Jason in serious danger.
Empowered with authority by the President, Truman launches a mustard gas attack to kill Miles and Monroe. To Rachel's disappointment, Miles agrees to join Monroe in a ruthless plot to beat the Patriots at their own game. Meanwhile, Neville faces his own challenge from the Patriots, and Aaron grows increasingly alarmed by the power of the nanotech.
United by their desire to take the Patriots down, Neville and Monroe form an uneasy alliance. While searching for Aaron, Rachel comes face to face with the nanotech; and things don't go according to plan for Miles, Charlie and Gene when they try to steal the Patriots' supply of mustard gas.
In the series finale, the stakes are higher than ever as the Patriots prepare for war. Miles, Charlie and Monroe launch an attack on the Patriots, but must improvise a risky new plan in order to halt the oncoming war between California and Texas. Out for revenge, Neville sets his sights on President Davis. Meanwhile, Aaron and Rachel's efforts to save Priscilla from the nanotech have unexpected consequences.