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.
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