Under The Dome - Season 3

Part 3 continues the story after the city Maine suddenly is covered by a giant invisible dome. But when the aircraft, which is flying in the sky, crashing into it and is crumbled. Besides, the arm of a certain gardener is cut off when the dome touches the ground. Those people work in the city can not go back home. No one can determine what is that dome, as well as where it comes from and when it disappears.