Big Jim rallies the town against Barbie after framing him for the murders and the shooting of Julia. Joe and Norrie move the mini-dome to Ben's house but it soon begins to act strangely.
Barbie, Sam, Pauline, Lyle and Hunter try to evade Don and his forces and find a way back to Chester's Mill, while Junior and Melanie hide the egg from Julia and Big Jim.
A friend of Julia's goes into labour after touching the dome. Big Jim kicks out Junior. Linda seeks out the Dundee brothers after Rose's murder. Joe and Norrie find a second mini-dome that holds a mysterious egg inside it.
As Barbie's fate lies in Big Jim's hands, the dome presents a new threat when it becomes magnetized. Meanwhile, Julia seeks out the help of a stranger to save the life of a mysterious girl.
After Junior abandons Angie, Joe and Norrie, the weather turns nasty. Julia is shot by Maxine. Big Jim convinces Linda his stash of propane is what's saving the town and the biggest threat they face is from Barbie.
Barbie realizes Don knows more about the dome than he is letting on when he asks him to help get a message to Julia. Back in Chester's Mill, Big Jim appoints himself sheriff of the town.
Following Duke's death, his house catches fire, forcing the town to rally together to form a bucket brigade. Elsewhere, Junior ambushes Barbie, while Dodee and Phil pick up a military frequency.