An epic adventure begins when a massive sinkhole opens in the middle of Los Angeles, pulling hundreds of people and buildings into its depths. Those who fell in find themselves in a mysterious and dangerous primeval land, where they have no choice but to band together to survive. Meanwhile, the rest of the world desperately seeks to understand what happened. In the search for answers, one family torn apart by this disaster will have to unlock the secrets of this inexplicable event to find a way back to each other.
The peaks and the valleys. Find the essential episodes — and the ones to skip.
With news of one last sinkhole opening, Gavin, Izzy and Dr. Nathan race to Seattle to launch a final rescue effort before it's too late. Eve embarks on a perilous journey to send a young boy though a portal in order to save her family.
With cold weather approaching, Eve, Levi and Ty return to the fort, despite their near-death experience there, hoping to learn 10,000 B.C. survival skills. Gavin's attempts to spare Izzy pain threatens their relationship.
When a stunning revelation puts Josh and Izzy's lives on the line, Eve and the other survivors desperately search for the young boy who holds the key to saving them. Gavin and Izzy must rely on a stranger if there is any hope to reunite their family.
As Gavin and Sam search for a secret military base, they're surprised by an old colleague of Gavin's who just may hold the clues to finding Eve. When Ty and Sam try to figure out how to bring their friends home, Ty becomes sidetracked as he confronts his demons from his past.
Each point is an episode, plotted in order. Colored bands mark season boundaries. Look for the rise, the plateau, or the decline.
High votes + high rating = beloved classic. High votes + low rating = notorious stinker. Low votes + high rating = hidden gem.
One point per season. Smooths out the episode-to-episode noise to reveal the bigger arc.
Did each season build or fizzle? Green means the finale outscored the premiere. Red means the opposite. Longer arrows, bigger swings.
How steady is each season? Tightly clustered dots mean reliable quality. Scattered dots mean a wild ride.
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