During a routine visit to the dentist, Ned Dorneget gets a shock when he discovers a bug implanted in his tooth. The investigation leads the team to a businessman-turned-terrorist seeking revenge against the Navy for his son's death.
The team discover that Dorneget was implanted with a high-tech listening device on the orders of Harper Dearing.
Gibbs and Harper Dearing meet each other for the first time.
It's revealed that Harper Dearing's reason for causing explosions on the ships is because his son, Evan died while serving on a Navy ship.
The team discover that Dearing got the information concerning Project: Aquamarine from a microchip that he got from both Jonathan Cole and Sean Latham who auctioned off the microchips during Nature of the Beast (episode).
The team soon discover that Dearing was on the Navy Yard, prompting a full-scale lock-down while they search for the terrorist.
Gibbs discovers that Dearing has left a scale model of "The Kelly" in the bushes.
In an attempt to capture Dearing, the team hold a small low-key Bachelor Party for Jimmy.