The battle with New Bern ensues, with Jericho residents out-manned and out-gunned, but not outsmarted. Jericho gains the upper hand but suffers a significant casualty. A friend of Jake's sends help from an unexpected source.

Hawkins receives a call on from someone who knows who he is, where he is and lets Hawkins know exactly when he'll be caught. Meanwhile, tragedy strikes.

Jake finds a stranger who is sick with radiation poisoning and he must make a decision whether or not to help him. The hospital’s generator is running out of gas and the residents find that their supplies are also running low.

The children of Jericho start to return back to school. A power line that has fallen causes an accident on the playground when the power returns. Jake has an argument with his mother regarding a secret that Jake hasn't disclosed to his dad.

The lives of Jake and Hawkins are explored during this flashback episode. This episode begins 36 hours before the bombs went off. Sarah is introduced and is associated to Hawkins. Jake had been living in San Diego.

Jake, his dad, Heather and Dale visit Black Jack to try and find the parts needed to fix the windmill. Sarah goes home with Hawkins against the rest of his family's wishes.

While on a hunting trip outside of Jericho, Jake, Stanley and Mimi find themselves in a dangerous situation when they run into some strangers. Meanwhile, Hawkins realizes that his family is in danger because of him. Emily and Roger work on their relationship.

After a company of Marines show up, the town of Jericho has hopes that life will finally start to return to normal. However, their behavior raises Jake's and Johnston's suspicions.

Roger gets desperate after Gray kicks the refugees out of Jericho. Dale and Skylar collect on some debts. Hawkins continues his quest to find Sarah's contacts. Meanwhile, Hawkins begins the process of finding who's coming after him.

Jake finds that Hawkins has not been honest with the residents of Jericho about his past and holds him at gunpoint for answers.

Jake believes something more is wrong after Eric doesn’t return from New Bern. Jake and Hawkins go to New Bern and discover that Jericho is in danger.

The hostility mounts between the citizens of Jericho and New Bern. A handful of residents of New Bern are shot and injured after getting caught trying to steal from the Jericho salt mine.

The residents of Jericho and New Bern fight over precious resources and Gray must make a tough decision after the streets of Jericho are bombed.

Jericho gets ready for a very important visitor from the new Cheyenne government. Meanwhile, Hawkins and Chavez work to find the new leaderships secrets.

The deadly Hudson River virus hits the area and a vaccine is being withheld from the citizens by a government official. Jake and the Rangers find a way to protect Jericho.

Jake and the Rangers take on Goetz and Ravenwood while a Jericho Ranger makes a choice that will alter his life. Meanwhile, an old friend comes to warn Heather that her loyalties to Major Beck have placed her in serious danger.

Following the Rangers' decision to take justice into their own hands, Major Beck goes to extreme measures to prove he's in complete control of the town, while Hawkins receives a call from Chavez telling him that it's time to transport the bomb.

Jake and Hawkins have one chance to expose the conspiracy behind the Cheyenne government to the independent Texas administration. However, getting there proves to be the most difficult part of their plan.

The fallout from the nuclear blast in Denver will hit Jericho in an hour and Jake has to get the residents inside. The official shelter is not adequate and Jake must find another shelter to protect them. Emily faces troubles of her own while being picked up by who she thinks are two officers.

Jake and Eric head out of Jericho to the nearby town of Rogue River to try and acquire some medicine for their father. While the brothers are at the hospital they encounter a combative group of individuals who call themselves Ravenwood. The brothers find that they’re trapped and must find a way back to Jericho.

Some of the residents of Jericho are concerned that Gray's actions may actually make Gray the new mayor. In other news, Mitchell claims that Jonah is the killer under much speculation.

The slick gang leader Jonah bails Mitchell out of jail and agrees to give back the food that his bandits stole and agrees to keep out of Jericho. This plan strays off-course as Jonah negotiates new terms involving Jake and Emily.

Supplies are dropped by air into Jericho and the Green's and Hawkins think that they know where they came from. Jonah Prowse returns to Jericho causing even more trouble.

After a nuclear disaster caused by several terrorist attacks wipes out most of North America, residents of a small Kansas town have to come to terms with a very different reality.

After seeing a broadcast via satellite from Asia, Jake gathers a group of people together for information gathering. After finding out that there is information out there, Jake suggests having four search parties to go out to get a better understanding what is going on outside of Jericho. The search parties set off in four different directions.