Just as the walls start to close in on those trapped in Chester’s Mill, a possible exit from the dome is revealed.
The latest threat intensifies, leaving Chester’s Mill residents at risk of being crushed to death; Melanie’s health declines as the egg’s fate remains uncertain.
Rebecca and Sam try to save Chester’s Mill residents as temperatures plunge; Barbie puts his life at risk to help Julia after a terrible accident.
Big Jim finally learns what happened to his wife, Pauline; Chester’s Mill faces a new threat — climate change.
Barbie is apprehended by mysterious men and relentlessly interrogated about the Dome; Big Jim forms a deal that could permanently seal the fate of the Chester’s Mill residents.
Barbie turns to his father for help contacting Julia but realizes that he may not be trustworthy; Big Jim declares himself sheriff of Chester’s Mill.
As Barbie descends further into the mysterious tunnel in hope of finding Sam, he comes across a world filled with unanswered questions.
A cave-in severs Barbie and Sam’s path back to Chester’s Mill during their investigation of a mysterious tunnel; a dust storm rages through the town, as Big Jim and Julia face off in a power struggle.
After Big Jim and Rebecca’s plan left the town divided, Julia takes over as the leader of Chester’s Mill; Norrie and Joe help Melanie find more clues.
Rebecca and Big Jim consider extreme measures as the conditions worsen in Chester’s Mill; clues about Melanie’s connection to the dome are revealed.