Black Ice

 is the eleventh episode of the second season of Under the Dome.

Synopsis
The Dome begins to rotate, which shifts the colder air of the upper atmosphere downward, sending Chester's Mill into a deep freeze. Melanie's condition worsens when people in Zenith discover the Egg. The townspeople take shelter to stay warm in the school, where Rebecca and Sam tend to the ill. Barbie and Julia are in an ambulance on the way to pick up food for the people at the school, when the vehicle spins out and capsizes, resulting in a piece of metal getting lodged in Julia's leg. Barbie carries her the rest of the way to the Sweetbriar and manages to revive her just in time. Big Jim heads down to the dock to look for fuel for the heat generator at the school, when he stumbles upon Lyle in the lake. Big Jim throws him a buoy and Lyle swims to safety. Lyle explains that his visions involved the world going up in flames in the near future. Pauline's opinion of her husband appears to change somewhat when she learns that he found the fuel and rescued Lyle. The Dome begins to rotate back in the morning, and the temperature starts to moderate again. Joe and Norrie grow suspicious of Hunter and follow him to the edge of the Dome, where they see him communicating via written messages with the head guard. The two kids confront Hunter afterwards, who explains that he was giving the guard false information so that the men in black will leave Chester's Mill alone. The Dome then starts contracting inward.