When a fog falls over the Clearing, Eve leads a defense against a group of invaders, only to encounter a threat more dangerous than they’ve faced before. In 1988, Josh and Riley pursue a woman who may hold the key to stopping the impending tidal wave disaster.

After the Clearing's destroyed in a dinosaur attack, the Survivors must find a new home. Gavin discovers a clue about where Eve has been taken, but tracking the lead down results in even more tragic consequences.

As the Survivors attempt to integrate with the villagers at the Fort, a flock of vicious pterodactyls attacks. Ty tries to figure out his next steps and seeks help from an old friend.