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As Big Jim continues to secure his power and takes steps to eliminate Barbie, the Monarch is crowned and the Dome sends a familiar face to Joe and Norrie to reveal the secret of the Dome.
While Big Jim convinces the townspeople to hunt Barbie down for his alleged crimes, Joe and Norrie move the mini-Dome
Big Jim frames Barbie for the deaths of his enemies, while Junior abandons the group and they discover the consequences when a storm gathers.
Julie learns about Peter's past, while Junior gets a promotion. Meanwhile, Maxine forces Barbie to fight in a staged arena contest.
Big Jim receives an unexpected visitor from his past, one with connections to another person trapped beneath the Dome. Meanwhile, Joe and Norrie find the source of the Dome in Joe's barn, and Barbie and Linda encounter someone with a connection Chester Mill's drug dealer.
Ollie takes control of the town's water supply and Big Jim must join forces with Barbie and Linda to get it back before his own control of Chester's Mill is threatened.
While Harriet goes into labor, Joe and Norrie investigate the source of the Dome in an attempt to save themselves and their fellow townspeople.
When the townspeople realize that their food and water are running out, they begin looting Chester's Mill for whatever remaining supplies that they can find.
Barbie receives word from the outside that the government is drawing their men back as the Dome interferes with magnetic fields.
When Chester's Mill is stricken by a meningitis outbreak, the townspeople panic when the clinic runs out of medicine and the Dome prevents anyone from bringing in new vaccine. Meanwhile, Julia learns the secret that Peter was hiding from her, and Junior is left in charge.
Joe ends up holding a party at his home where the town's teenagers gather to enjoy one of the few generators in town after the power goes out. Meanwhile, Barbie and Big Jim search for Paul after he escapes custody, and Junior looks for a way out of Chester's Mill.
As the reality of their situation settles in, the townspeople's tempers start to fray. Meanwhile, Big Jim sends Reverend Coggins to remove the evidence from Duke's house, and Junior stalks Barbie.
The townspeople of Chester's Mill discover themselves unexpectedly cut off from the outside world when an invisible dome springs up around the town, sealing them in... with limited food, water, air, and medicine.