One year after the dome disappears, Barbie, Joe, and the other townspeople gather for a memorial. Meanwhile, a year earlier, Julia and Junior try to rescue Barbie and the others, but run afoul of Big Jim.
Barbie investigates Ben's claim that something strange is going on in Chester's Mill, but Eva surprises him with unexpected news. Meanwhile, Norrie and Hunter grow closer, and Christine advises Joe to move on.
In the aftermath of the townspeople's experiences in the other reality, people begin acting strangely and Big Jim suspects that something has fundamentally changed the others. Meanwhile, the person responsible sends Melanie to kill Julia.
-- Do You Wanna Dance?
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. Also, Julia and Big Jim make shocking discoveries that reveal a new threat within the Dome.