A potential exit from the Dome is revealed just as the walls begin closing in on those trapped in Chester's Mill.
When a new threat from the Dome intensifies, the residents of Chester's Mill find themselves at risk of being crushed to death.
When temperatures begin to plunge, Sam and Rebecca spring into action to try to save the residents of Chester's Mill.
Big Jim finally learns the shocking truth about what really happened to his wife, Pauline, when they are reunited.
When Barbie is apprehended by a group of mysterious men, he is relentlessly interrogated about his connection to the Dome.
When Barbie enlists his father's help to reach out to Julia, he realizes that Don may know more about the Dome than he is letting on. Brett Cullen guest stars.
When Barbie descends into the unknown abyss in the mysterious tunnel to look for Sam, he discovers a world that is familiar but filled with unanswered questions.
When Barbie and Sam set out to investigate a mysterious tunnel, a cave-in severs their path back to Chester's Mill.
Julia takes over as the leader of Chester's Mill after the town becomes divided in the wake of Big Jim and Rebecca's plans for population control.
As conditions in Chester's Mill worsen, Big Jim and Rebecca consider resorting to the extreme measure of population control, which drives a wedge between Barbie and Julia. Dwight Yoakam guest stars.
When tensions in Chester's Mill continue to rise as resources dwindle, Big Jim holds a census in order to forecast how long the town can continue to exist under the dire conditions. Dwight Yoakam guest stars.
Barbie risks his life to help Rebecca save the Chester's Mill food supply when she discovers an infestation of butterfly eggs on the town's crops.
Secrets of the Dome are revealed and Big Jim is determined to put an end to Barbie once and for all.
While the manhunt for Barbie continues, Big Jim gets the residents of Chester's Mill riled up and the town demands justice for all of Barbie's supposed crimes.
Big Jim turns the town against Barbie when the truth about his past is revealed. Meanwhile, Maxine makes it personal when she confronts Barbie's closest ally.
Julia uncovers the truth about her husband's disappearance and unravels some of Chester's Mill's darkest secrets.
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