As a massive tsunami heads for the east coast, Laura must save Rich by heading to North Carolina where Miles and his family are trying to escape with their lives.
Laura and Rich decide that it's time to get some answers from Lee. Miles gets in trouble with the local residents after a violent incident with a bully.
Laura and Rich race to construct a submersible so they can observe a spawning site. Miles's parents consider sending him to a boot camp for problem children.
Laura attaches a GPS devise to one of the creatures in order to track it. Cirko testifies before the Pentagon that the unidentified species is extremely dangerous.
Laura and Rich make a startling discovery while in diving in their struggling submersible. Miles tries to reunite with Nimrod, and finds that Nimrod is not alone.