In a small town suddenly cut off from the outside world, an impenetrable dome descends, trapping its residents in a surreal and terrifying reality. As the citizens grapple with the shock of their confinement, tensions rise and old rivalries ignite, pushing them to their limits. Among the key figures are Mike Vogel as the resourceful and determined Dale "Barbie" Barbara, who fights to protect his loved ones, and Rachelle Lefevre as Julia Shumway, a tenacious journalist seeking the truth behind the dome's mysterious appearance.

The ensemble cast also features Dean Norris as the authoritarian Big Jim Rennie, whose ambitions threaten the fragile order within the dome, and Karla Crome as the insightful and brave Norrie Calvert, who discovers she has a unique connection to the dome's enigma. As secrets unravel and survival becomes uncertain, the atmosphere shifts between suspense and drama, exploring themes of power, community, and the human spirit under extreme pressure. With each passing episode, the inhabitants must confront not just the external threat of the dome, but also the darker sides of themselves, making for a thrilling journey filled with unexpected twists and emotional depth.