Gavin leads the survivors in trying to find Eve, Josh and Riley and a way back to their old lives.

A traitor turning on the survivors leads to a deadly confrontation as they're shocked to learn where Eve has been taken.

When a massive fire breaks out, forcing everyone to flee, Sam and Lucas lead the group's fight for survival; Gavin is kidnapped by a woman with a surprising connection to his old life who may hold the answers about Eve that he's been seeking.

As Gavin and Sam search for a secret military base, they're surprised by an old colleague of Gavin's who may hold the clues to finding Eve; when Ty and Sam try to figure out how to bring their friends home; Ty becomes sidetracked by his past demons.

As the survivors attempt to integrate with the villagers at the fort, a flock of pterodactyls attack their new home; Ty tries to figure out his next steps and seeks help from an old friend.

After the clearing is destroyed in a dinosaur attack, Levi, Sam and the other survivors must find a new home to live. Gavin meanwhile discovers a clue about where Eve has gone, though tracking the lead down results in more tragic consequences.