After Julia and Dodee speculate that the source of the radio signal jam could be the answer to the dome's origin, they are led to Joe and Norrie. Meanwhile, Angie seeks help after escaping from Junior.
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.
Julia takes Barbie to see the mini-dome and the egg, but they have both disappeared. A former acquaintance of Big Jim and Barbie makes a re-appearance. Angie starts to experience the same seizures as Joe and Norrie.
Maxine continues to manipulate Barbie and Big Jim. Linda and Julia investigate Duke's involvement with previous criminal activity in Chester's Mill. Meanwhile, Angie realizes Junior is the "fourth hand".
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.