Travis, Madison, and their blended family set sail on Strand's boat off the coast of California in an effort to escape the apocalypse. While they're looking for safety, they only find more trouble at sea.

The group seeks shelter with a survivalist family. Madison tries to uncover the family's true motives. Meanwhile, Salazar works to discover Strand's intentions.

Madison confronts Strand about his mysterious destination. Meanwhile, Nick, Alicia and others inspect wreckage from a plane crash.

The group lets a family in distress board the Abigail. Strand's past begins to come to light. Nick looks for an associate of Strand's.

Alicia works toward reuniting with her family. Travis comes across a familiar face. Madison and Nick try to save their family against all odds.

Conflict arises as the Abigail approaches its destination. Chris makes a staggering decision. Nick meets a new maternal figure.

The family faces their biggest test yet. Nick, Madison, Travis and others try to stay close to each other.

Nick's steadfeast search for answers leads him into a deadly dog-eat-dog landscape. A dark piece of his past is uncovered.