About Under the Dome Season 3, Episode 2 :

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. Guest Stars: John Elvis, Grace Victoria Cox, Brett Cullen, Marg Helgenberger, Max Ehrich, Ryan Shams, Shelton Grant, Eriq La Salle, Edward Gelhaus, Hailey Wist, Mike Whaley, Hailey Gutierrez,