In a toxic future, the last of humanity survives inside a vast underground silo, bound by rules meant to keep them safe — or keep them contained. Engineer Juliette Nichols won't stop digging for the truth, no matter the cost. Season 3 splits time itself: Juliette fights to save her home in the present, while a journalist and a congressman in the "before times" stumble onto the conspiracy that built the silos. Apple TV's acclaimed dystopian thriller returns to reveal how it all began.