Under The Dome Season 3 - Episode 12 -

This episode sets the stage for the series finale, " The Enemy Within ," as the dome's barrier finally begins its terminal breakdown. AI responses may include mistakes. Learn more Under the Dome recap: Incandescance - Entertainment Weekly

As oxygen levels drop, Joe McAlister is under immense pressure to complete the device intended to bring the dome down. Under the Dome Season 3 - Episode 12

Killed by Big Jim during his attempt to murder Joe. Production Details Original Air Date: September 3, 2015. Director: P.J. Pesce. This episode sets the stage for the series

In the penultimate episode of , titled " Incandescence ," the residents of Chester’s Mill face a 24-hour deadline before the dome’s accelerating calcification causes everyone inside to suffocate. Plot Summary " The Enemy Within