While most of the landscape is destroyed by nuclear warheads, Strand thrives in one of the few inhabitable places left; Strand's search for survivors uncovers a stranger with an unexpected connection to his past.

As Morgan, Grace and Mo struggle to adapt to life on the submarine, a food shortage forces them to face the nuclear fallout outside the sub.

June and Dorie's routine in Teddy's fallout shelter is disrupted when they discover the origins of their home and its sinister connections to Teddy's past.

Against the advice of the group, Sarah searches for Wendell, and in the process encounters a dangerous survivor who forces her to take part in a search of his own.

With a code to guide them, Dwight and Sherry become ethical outlaws known as the Dark Horses; when Strand recruits them for a search and rescue mission, it forces them to question their code and their future.

Morgan searches for Al, only to discover that he's not the only one looking for her, and that his search may have put a target on his own back.

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