Under the Dome tells the story of the residents of the fictional small town of Chester's Mill, when a massive, transparent and indestructible dome suddenly cuts them off from the rest of the world. Military forces, the government, and the media start positioning themselves outside the barrier in an attempt to break it down. As this happens, the residents trapped inside find their own ways to survive with diminishing resources and rising tensions. A small group of people inside the dome unravel the complicated mysteries to figure out what the dome is, where it came from, and when (and if) it will go away.