With cold weather approaching, Eve, Levi and Ty return to the fort, hoping to learn 10,000 B.C. survival skills.
With time running out before their window home closes, the survivors hatch a final escape attempt, forcing Eve to make an impossible choice.
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.
Eve, Levi and the rest of the search party explore a mysterious fort; Gavin and Izzy embark on a dangerous and unauthorized mission.
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.
