Big Jim and the other resistance fighters make one last attempt to prevent the Kinship and their new queen from infecting the world outside the dome.
With the dome calcifying, Joe struggles to bring it down before all of the residents suffocate. Meanwhile, Big Jim tries to deal with Hektor, while Barbie and Julia try to save the new queen.moreless
Joe learns more about Christine's plans and decides to help her bring down the dome. Meanwhile, the resistance tries to save their loved ones, and Hektor asks Julia and Big Jim to help him with a cure.moreless
After Julia frees him from the Kinship's influence, Barbie goes back to town hall to find out what Christine and the others are up to. Meanwhile, Hektor rescues Big Jim, Norrie, and Hunter from the attacking Millers, and they take refuge at another of Big Jim's safehouses.moreless
Big Jim and Julia target Barbie and Eva to break Christine's grip on the Kinship. Meanwhile, Hunter finds information on Hektor Martin, the head of Aktaion.
Julia and Big Jim go to blow up the cave when they learn that the crystals are the key to Christine's plan. Meanwhile, Norrie and Joe try to free Carolyn from the Kinship's influence, and Barbie and Eva bond.moreless
As meteors rain down outside of the dome, Eva attempts to convince Barbie to join the Kinship. Meanwhile, Julia and Big Jim share a drink, and Norrie and Joe discover a way to break the townspeople free of Christine's control.moreless
While Marston forces Big Jim to try to find out what Christine has planned, Carolyn recruits Norrie to x-ray Hunter while Junior forces Joe to work for the Kinship.
While Big Jim and Julia join forces against Aktaion and Christine, Christine plots to convert or eliminate those who resist her and her alien influence.
While Christine manipulates the townspeople, Big Jim and Julia learn of a new threat.
Big Jim suspects new residents Eva and Christine of plotting against the town, while the other townspeople try to return to their lives.
As the Dome collapses, Joe, Norrie, and Hunter find a way out. Meanwhile, Big Jim loses someone close to him and tries to make a deal with the Dome.
With the egg gone, the Dome starts contracting, threatening everyone within. Barbie contacts his father and demands the egg, revealing the presence of his half-sister. Meanwhile, Melanie's condition grows worse and Big Jim works with Pauline to create a new painting that will show them the way.moreless
The temperatures inside the Dome plummet and Julia and Barbie go to save the food, while Big Jim looks for fuel to power the generator at the high school. Meanwhile, Melanie begins to suffer and Junior realizes that her health is tied to the egg.moreless