On the series premiere, the Harris family is split up when a huge sinkhole opens in Los Angeles; Eve and her son end up in a primeval world.
A stunning revelation puts Josh and Izzy's lives on the line; Eve and the other survivors search for a boy who holds the key to saving them.
With cold weather approaching, Eve, Levi and Ty return to the fort, hoping to learn 10,000 B.C. survival skills.
Eve navigates the dangerous wilderness in order to save Josh; Gavin and Izzy work to prove survivors are alive inside the sinkhole.
On the season finale, there’s news of one last sinkhole opening and a race to Seattle to launch a final rescue effort before it's too late.
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