A small Kansas town finds itself cut off from the rest of the world after a mushroom cloud appears on the horizon, and a TV and radio blackout ensues.

1. Pilot 41m In the wake of a nuclear attack, Jake Green returns to his hometown of Jericho, Kan., after a mysterious five-year absence.

2. Fallout 42m Jake rallies Jericho residents to take shelter from fallout from the nuclear bomb that destroyed Denver. However, the shelter is uninhabitable.

3. Four Horsemen 45m Satellite news reports the extent of the nuclear catastrophe to the shell-shocked townspeople, and Stanley claims he saw tanks rolling into Denver.

4. Walls of Jericho 41m Despite the risk of contamination, Jake and Heather rescue a man disfigured by extensive radiation poisoning and bring him to the hospital.

5. Federal Response 43m Homeland Security phones Jericho with a recorded message promising help will arrive soon. Hopes rise when communication is restored and power returns.

6. 9:02 42m At precisely 9:02, an electromagnetic pulse shuts down power in Jericho, leaving the town in the dark. Farmers desperately try to save their crops.

7. Long Live the Mayor 45m Gray Anderson, shocked by the horrors he witnessed when traveling outside of Jericho, returns with information about which other cities were targeted.

8. Rogue River 43m Mayor Green faces certain death if Jake and Eric fail to bring back medication in time. Meanwhile, Gray Anderson interrogates Rob Hawkins.

9. Crossroads 43m The Ravenwood gang Jake and Eric encountered at Rogue River shows up in Jericho and takes resources by force.

10. Red Flag 42m During Thanksgiving, the exhausted townspeople are simultaneously elated and wary when bombers fly overhead and drop parachutes holding supplies.

11. Vox Populi 45m Gray Anderson uses a murder investigation to boost his reputation among the townspeople, hoping it will help him win the mayoral election.

12. The Day Before 42m Flashbacks reveal that before the bombs struck, Jake failed to secure a job as a charter pilot because his file was flagged as suspicious.

13. Black Jack 43m Jake and Johnston take a trip to the Black Jack trading post, looking for parts to repair Jericho's windmill.

14. Heart of Winter 45m Strangers run Jake, Stanley and Mimi off the road while they are hunting, pinning Jake under the vehicle and knocking Stanley unconscious.

15. Semper Fidelis 43m Marines roll into Jericho in a tank and tell the townspeople that the war has ended, with the United States bombing Iran and North Korea.

16. Winter's End 45m Jake forces Kenchy to perform a risky operation on April as complications arise with her pregnancy. Meanwhile, Johnston searches frantically for Eric.

17. One Man's Terrorist 42m With supplies dwindling, Mayor Gray Anderson decides to evict the refugees. Meanwhile, terrorists in New York are revealed to have used false FBI IDs.

18. A.K.A 43m Horrified by the mounting evidence that Hawkins is a terrorist, Jake holds him at gunpoint and demands answers.

19. Casus Belli 45m Eric goes missing after assisting with the construction of wind turbines in the neighboring town of New Bern.

20. One if by Land 42m When townspeople from New Bern raid Jericho's salt mine, a gun battle results in several New Bern citizens being injured.

21. Coalition of the Willing 45m New Bern threatens to take aggressive action against Jericho unless they hand over seven farms and half their salt mine.