
Naval Criminal Investigative Service Special Agent Leroy Jethro Gibbs leads a group of colorful personalities in investigating crimes -- ranging from murder and espionage to terrorism -- that have evidence connected to Navy and Marine Corps personnel. The team includes MIT graduate Timothy McGee, Ellie Bishop, who specializes in international threat assessment, charismatic and unpredictable Nick Torres, and forensic psychologist Jack Sloane. Dr. Donald "Ducky" Mallard brings his vast experience in forensics into play to help solve cases.

NCIS investigates the death of a college student who was killed while running across the street and had connections to McGee's wife.

The team investigates a bomb tech's guarded personal life after she is attacked.

Abby becomes fixated on solving a murder; DiNozzo's latest fling leads to an interesting Halloween.

Dinozzo's father (Robert Wagner) returns and plays an important role in a murder investigation.