The Naval Criminal Investigative Service's team, led by Special Agent Leroy Jethro Gibbs, conducts criminal investigations involving the U.S. Navy and Marine Corps.

S1, E6

High Seas

Gibbs and his team board an aircraft carrier to find out how a sailor with no history of drug abuse overdosed on methamphetamines.

S1, E7

Sub Rosa

A decomposed body found in a tub of acid at a naval base leads Gibbs to deduce that an impostor is serving aboard one of the nuclear submarines.

S1, E8

Minimum Security

The team travels to Guantanamo Bay in Cuba to probe a Navy translator's death caused by swallowing emeralds smuggled from Afghanistan.

S1, E9

Marine Down

When a widow gets a telephone call from her late husband, the team must exhume the body believed to be that of the Marine.

S1, E10

Left for Dead

After digging herself out of a grave, an amnesiac can remember one thing: a bomb is hidden on a Navy ship.