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. Meanwhile, Big Jim appoints himself sheriff of Chester's Mill. Brett Cullen guest stars. (TV-14 L, V)
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.
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