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When a mysterious illness hits military families, the team scrambles to find a cure before Chrismas on this NCIS.
Gibbs is put in an awkward position when a murder victim ends up having a link to Gibbs' ex-wife's new boyfriend on NCIS.
When the Secretary of the Navy is bugged during a confidential meeting the NCIS team partners with an NSA analyst who predicted the breach two years earlier on NCIS
McGee questions Tony's odd behavior as the team investigates a hit and run that turns out to be murder on NCIS.
Gibbs leaves mid-case to help his father reconnect with a former war pilot.
NCIS partners with the Coast Guard Investigative Service (CGIS) to investigate a suspicious explosion on board an oil rig. Meanwhile, no one is safe from a mysterious prankster who is targeting the NCIS team.
DiNozzo returns to his Baltimore Police Department days when he sees a felony suspect from a 15-year-old case at the NCIS crime scene of a murdered Petty Officer.
When a woman who impersonated a soldier is murdered, Gibbs and McGee travel to Afghanistan to investigate on NCIS.
When a Navy Lieutenant goes missing, the team must use Twitter to help track him down on NCIS.
As the team tracks a terrorist, Tony travels to Israel to find Ziva in part two of the season-opening arc.