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.
Eve navigates the dangerous wilderness in order to save Josh; Gavin and Izzy work to prove survivors are alive inside the sinkhole.
When a superstorm hits the clearing, a structural collapse puts Marybeth and Lucas in danger; Gavin embarks on a journey into his past.
Eve and Ty venture into the forest on a risky hunting expedition; Gavin must put his faith in the hands of an old friend.
Eve, Levi and the rest of the search party explore a mysterious fort; Gavin and Izzy embark on a dangerous and unauthorized mission.
