One day, electricity just stopped working and the world was suddenly thrust back into the dark ages. Now, 15 years later, a young woman's life is dramatically changed when a local militia arrives and kills her father, who mysteriously—and unbeknownst to her—had something to do with the blackout. An unlikely group sets out off on a daring journey to find answers about the past in the hopes of reclaiming the future.
Miles, Aaron and Rachel have found themselves in a mysterious small town, in the great nation of Texas where Rachel unexpectedly encounters an important figure from her past. Charlie finds herself on a mission in the Plains Nation while Neville and Jason search a refugee camp for a lost loved one. Meanwhile, Monroe has discovered a gritty role in his new environment.
Miles's life is in grave danger as he finds himself in the clutches of Titus Andover. Charlie is determined to find Monroe, as Rachel and her father, Dr. Porter desperately attempt to revive Aaron. Meanwhile, Neville hatches a plan to infiltrate the Patriots.
Rachel makes a valiant attempt to rescue Miles and to escape with an ailing Tribesman's wife, while Neville and Jason are caught off-guard, assaulted by violent refugees. Charlie and Adam are at odds over what to do with Monroe. Legions of Tribesmen threaten all of Willoughby but with questionable leadership and Aaron faces death, yet again.
Monroe and Charlie's dynamic begin to evolve. Meanwhile, wounds of Miles and Rachel begin to heal, yet her curiosity and heightened awareness could be her undoing. Neville's manipulation of Patriot power brokers makes Machiavelli look like a cherub and Aaron's mind works overtime awake or asleep with mind-blowing effectiveness. Rachel and Miles begin planning a resistance to what they believe might be the Patriot occupation.
Aaron and Rachel speculate on the extreme effects of Nano technology, while he also confides in Cynthia. Meanwhile a figure from Miles's rugged past, Texas Ranger John Fry reemerges. Fry could be Miles' chance to bring down the Patriots in a big way, however Fry will need convincing. Charlie has a surprise for Miles and her mother, while Secretary Allenford holds a secret important to Neville.
As Charlie, Rachel and Gene question Monroe's true allegiance, Miles himself is weary of his former friend's intentions. Meanwhile, Aaron continues to have visions that lead to endless questions.
When Rachel discovers some unsettling truths, Miles does what he does best to overcome obstacles before him and those he cares about. Meanwhile, Charlie shares a moment with her mom as Neville and Jason continue with their struggles between father and son.
As Miles and the gang try to escape the perils of their current situation, Rachel and Gene continue to struggle with their relationship, which affects Charlie. Meanwhile, Neville takes a gamble with the Patriots.
The relationship between Rachel and Gene remains strained as Charlie shows her mom how much she's grown. Meanwhile, Neville gives Jason a determined proclamation.
When Miles leads Monroe and Rachel south of the border; they're met with much more than they bargained for as Neville and Julia dance a delicate dance. Meanwhile, Charlie and Gene continue their search for Aaron.
Monroe finds himself in unfamiliar territory and must make a choice about his son Conner, while Neville and Julia continue to tango at Jason's dismay. Meanwhile, Gene leads Charlie to an uneasy discovery.
When Gene decides to assist the town of Willoughby, Rachel and Charlie feel compelled to help too as Miles and Monroe continue to join forces in order to survive.
Monroe leads Connor and Charlie on a risky mission, as Miles and Rachel keep an eye on things in Willoughby. Meanwhile, Neville gets a new assignment and Aaron reunites with an old friend.
With their lives in danger in New Vegas, Monroe and Connor face a difficult decision in order to survive. Back in Willoughby, Miles questions whether he can trust Neville and Jason to help take down the Patriots. Meanwhile, Aaron and Priscilla find themselves at odds over the nano code.
Aaron awakes to find himself in a world with power, married to Priscilla and running his company. As he gets the feeling that something isn't quite right, familiar faces begin to appear.
Monroe, Charlie and Connor make their way back to Willoughby, where they find that the Patriots' reeducation center is up and running. An encounter with two of the center's young cadets leaves Rachel and Miles divided on the lengths they are willing to go in order to take down the Patriots. As Neville and Jason find a new ally for their mission, more about the history of the Patriots is revealed.
While Dr. Porter and Miles venture into Willoughby in search of allies within the town, Monroe seizes an opportunity to surprise the Patriots. Neville’s political maneuverings put him and Jason in serious danger, as Aaron and Priscilla continue on their journey.
Frustrated with Neville, Jason turns to Miles with crucial information about the Patriots’ next steps for Texas. Determined to derail the Patriots’ plans, Miles and Monroe rush to Austin with Jason, Charlie and Connor in tow. Meanwhile, Aaron grows suspicious of Priscilla’s increasingly unusual behavior.
As Miles, Monroe, Charlie and Connor rush to escape Austin, a confrontation with Texas Rangers separates Miles from the group. While out searching for Miles, Charlie is confronted by Neville who demands information on Jason's whereabouts. As a wounded Miles faces increasingly hopeless circumstances, Aaron learns that the nanotech has been busy.
Truman, empowered with new authority from the President, launches a mustard gas attack designed 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. As Neville faces his own challenge from the Patriots, 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. As Rachel comes face-to-face with the nano-tech while searching for Aaron, things don't go according to plan for Miles, Charlie and Gene when they try to steal the Patriots' supply of mustard gas.
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 nano-tech has unexpected consequences.