Jake secretly worked with Robert Hawkins, whom he eventually saw as a friend, to get the last remaining nuclear bomb from the September Attacks to the Independent Republic of Texas.
Hawkins claimed he was a former police officer from St. Louis, Missouri and explains his knowledge and expertise comes from having received training from the Department of Homeland Security after the September 11, 2001, attacks.
These include secret communications with unknown persons through a locked laptop computer, the monitoring of shortwave radio messages and the storage of a large unmarked barrel containing the 20-kiloton (kt) nuclear device that he was assigned to deliver to Columbus, Ohio, and detonate.
Seeing the ASA was attempting to dominate the country and bury the truth behind the Attacks, Hawkins and Jake teamed up to deliver the bomb to the Independent Republic of Texas to expose the conspiracy, which started the Second American Civil War.
When Heather leaves for New Bern, Emily begins to get closer with Jake; this development is interrupted by the unexpected return of her fiancé Roger Hammond, who is soon exiled from Jericho.
He has an interest in Skylar Stevens, and overcomes her snobbish disdain by bringing her supplies from the store; she even asks him to stay with her after his own home burns down, and bails him out of jail when he briefly aids Mitchell Cafferty's activities in Jericho.
When the ASA severely restricts commerce, Dale turns to smuggling; among other things he obtains a vaccine for the Hudson River Virus, helping Jericho and surrounding communities to inoculate themselves.
When his parents were killed in a car accident, Stanley willingly sacrificed his chance at a football scholarship to take care of his deaf baby sister Bonnie.
After the September Attacks, Mimi finds herself stranded in Jericho; after her motel closes, she writes off some of Stanley's debt in exchange for room and board at the Richmond farm.
On Hoffman's specific recommendation, Beck hires Heather to be a liaison between Jericho and New Bern, and appoints Jake as the new Sheriff, recognizing him as "the guy" whom others follow and listen to in the heat of conflict.
Ultimately, Beck, learning that the new government covered up the origins of the bombs and unjustly destroyed Iran and North Korea, lays the case before his subordinate officers and tells them he will no longer take orders from the ASA.
In Season 2, Mary finds her bar back in business with the arrival of the A.S. Army, and eventually uses it as a hiding and meeting place for the Jericho Rangers in their growing struggle against the Allied States of America.
April Green (portrayed by Darby Stanchfield) is a doctor at Jericho's medical center, and unhappily married to Eric; she files for divorce but, after the Attacks, changes her mind and decides to make the marriage work.
However, power goes out and Kenchay can't see enough to stop the bleeding, eventually declaring it to be a lost cause and ordering the team to close April up so she can die in peace.
Although kind and generous when the right people approach her (even giving Dale Turner a place to sleep after his mother is killed in the Atlanta explosion and after his home burned down), Gracie is nosy, opinionated and somewhat ruthless in business.
Gracie shares the store's profit with Jonah Prowse by charging high prices and even bartering for family heirlooms, causing resentment among Jericho's residents.
He tends to side with decisions that favor brute force or absolute action over diplomatic means, and preferred Gray Anderson's more strict policies regarding the ejection of refugees when the town's food supplies started to dwindle.
After she learns that her father knew the September Attacks were coming, and that his efforts saved their lives, they begin to bond; Robert teaches her to properly shoot guns and to type straight IP addresses.
Doctor Kenchy Dhuwalia (portrayed by Aasif Mandvi) joined the Red Cross to escape Las Vegas, where supplies of water and electricity were crippled by the attacks.
Sarah Mason (portrayed by Siena Goines) was a CIA deep-cover agent, participant in Project Red Bell, and lover of her teammate Robert Hawkins.
Following the Attacks and the deaths of the other members of Red Bell, Sarah comes to Jericho as a refugee, and re-connects with Robert, planning to obtain the 20-kiloton nuclear device in his possession and keep it for herself, double-crossing her employers.
Constantino learns that Heather is unknowingly helping Beck against the New Bern Resistance, and puts a bounty on her head, although Russell (presumably) gets it lifted by delivering John Goetz's corpse, improving their resolve to fight.
Roger Hammond (portrayed by Christopher Wiehl) was a wealthy and successful banker from Chicago who was engaged to Emily Sullivan (against his parents' disapproval) before the September Attacks.
After the September Attacks, Jonah's side business becomes permanent and he finds himself commanding a number of young men, including Mitchell, and possessing access to weapons and supplies that Jericho desperately needs.
His cover identity was that of a soldier, Lieutenant Parker, who was killed in Afghanistan; in that persona he infiltrates the ASA military, and arrives in Jericho with Major Beck in season 2.
With Jake's help, Chavez escapes while being transported to Loomer Ridge Prison; he travels to Texas to plead the cover-up case, planning to get Hawkins to bring the bomb as proof.
Victor Miller (portrayed by Adam Donshik) was a CIA deep-cover agent; he persuaded Robert Hawkins to come out of retirement to take part in Project Red Bell.
The orders for Red Bell, if they failed to stop the September Attacks, were to rendezvous in Jericho with family members only; but Victor, unwilling to stand by and see others die, gathers twenty survivors along with his daughter.
Valente sends Major Beck and his battalion to Jericho to end their border war with New Bern, and makes it clear his primary objective is to find and kill Sarah Mason (though by this point she is long dead).
Goetz returns in Season 2, sent by Jennings & Rall (as a private contractor for the Allied States of America) to replace Major Beck as Jericho's chief administrator.