As the seaQuest undergoes inspection, Lieutenant Benjamin Krieg has a close encounter with an unknown life form while in a seaCrab in the Tonga Trench.

When the creature lets him go, Krieg discovers a treasure trove of mysterious glowing stones; stones that may mean big money.

However, is the bigger threat to seaQuest the greed that overtakes the crew or the unknown life form?

The seaQuest is ordered to entomb a munitions depot thought to be abandoned.

However, when the crew discovers children living inside, Bridger must convince them to follow him to safety.

The crew members travel through a ""space-time sphere"" that rockets them back in time to October 1962.

This places them in the midst of the Cuban missile crisis where they have to try to prevent a nuclear holocaust.