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The Dome is a gigantic glass dome placed over Springfield by the US Government and EPA. It is an almost impenetrable object that was put over Springfield due to it being the most polluted town in the World. It was a crisis so bad, it had its own name and theme music, Trappuccino.

The Dome could easily crush people when coming down, as one unfortunate person found out. It had to be transported by loads of helicopters with suction cups holding it up.

Mr. Burns brought in a second dome to cover Springfield with after everyone treated him horribly. He didn't go through with it after he was told that it had already been done before. Lou then states that they could always just dig out of it.