On the new residents front, it looks like Marg Helgenberger will guest star as Christine Price, a Chester's Mill resident with insight into the Dome's origins, and Eriq La Salle guest stars as Hektor Martin, the ruthless CEO of the energy company run by Barbie's (Mike Vogel) father.
The residents of Chester's Mill appear both inside and outside the Dome following their mysterious encounter in the tunnels beneath the town. As the Dome begins to reveal its ultimate agenda, the townspeople are forced to question what and whom they can trust as fresh threats appear, new residents emerge and surprising alliances form."
And on the "surprising alliances" front, TV Guide has some scoop on why (gasp!) Big Jim Rennie (Dean Norris) and Julia Shumway (Rachelle Lefevre) will actually be on the same side this season, even though she was last seen stabbing him to stop him from killing her. As UTD creator Neal Baer told TV Guide:
The showrunner said this alliance is tied to who or what is really behind the Dome:
Julia and Big Jim become - I wouldn't say bosom buddies, but they certainly become allies against everyone. They unite against the enemy within. That's the theme of this season ... struggling to live under the dome and fight the enemy within. And it's not Big Jim."
Big Jim is right?! Don't tell him, it'll go straight to his ego. Are you coming along for the ride with this crazy train departs on Thursday?
Big Jim and Julia really come to terms where he says, 'You've always said the Dome was here to protect us. You've always had faith in the Dome. You're wrong.' And Julia comes to see that maybe Big Jim is right."
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