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.

S4, E6

Witch Hunt

The NCIS team investigates when a Marine is attacked in his home and his daughter is kidnapped on Halloween; Abby's Halloween costume leaves McGee and Tony speechless.

S4, E7


Gibbs' team works with the Army Criminal Investigative Unit to investigate a suspected terrorist attack that killed a Marine colonel at a military country club.

S4, E8

Once a Hero

Suspicious activity surrounds a decorated Marine veteran's death, leading the NCIS team to try to clear his name.

S4, E9

Twisted Sister

McGee takes things into his own hands, forgoing NCIS procedure, when his sister arrives on his doorstep, bloodied and confused.

S4, E10


The NCIS team joins forces with the FBI when a burned and mummified body found in a furnace turns out to be that of a serial killer the FBI had been chasing for more than a decade.