After following Melanie through the tunnels, most of the residents of Chester's Mill find themselves outside the dome. Barbie finds Julia dead but along with the other survivors, he moves with his life. A year later, he's working for a private security firm rescuing kidnap victims. He's in a new relationship with Eva Sinclair and decides to to return to Chester's Mill for a memorial service that is being held on the first anniversary of their escape. While newly arrived Christine Price provides counseling to the townsfolk, Barbie begins to realize that everything around them is just too perfect. Written by garykmcd

The townspeople are forced to question who they can trust when new residents emerge.

The residents of Chester's Mill try to move on after emerging from the cocoons in the tunnels. Big Jim becomes suspicious of Christine and Eva.

Under the guise of helping Chester's Mill rebuild, Christine urges the townspeople towards specific individuals and projects that remind them of their experience in the tunnels.

When Big Jim and Julia team up to find proof to discredit Christine, they learn something new about the dome. Meanwhile, when Christine's leadership is threatened, she puts a plan into motion with deadly consequences.

After being captured by Aktaion, Big Jim is forced to manipulate Christine for information about her agenda. Meanwhile, when Joe and Norrie question the town's new rules, they find themselves in a dangerous face-off with the increasingly unstable residents.

As the outside world is rocked by a catastrophic meteor shower, unexpected alliances form under the dome. Meanwhile, Eva tries to indoctrinate Barbie deeper into The Kinship.

A resistance forms against Christine, who is organizing a massive excavation project in the caves. Hunter and Big Jim make contact with the outside world.

Julia and Big Jim come up with a life-or-death plan involving Eva and Barbie intended to end Christine's control over Chester's Mill. Hunter investigates Aktaion.

An unlikely alliance is formed; Hunter receives files that reveal disturbing details about the infected townspeople.

Barbie risks everything in an attempt to free Eva from The Kinship, Big Jim and Julia are enlisted by Hektor to test a possible cure for infected townspeople. Joe chooses to work with Christine after she shares some shocking information about the Dome. Written by ab1995

As the dome's calcification accelerates, the townspeople have 24 hours left before they will suffocate; Julia and Barbie race to save Barbie's child; Hektor is adamant that the infected townspeople should never escape from the dome.

As the dome comes down, a final attempt is made to keep infected townspeople from impacting the outside world.