When DiNozzo confronts a man impersonating a Navy officer, guns are drawn and the perpetrator is left dead. Robert Wagner guest stars.
After uncovering faulty bulletproof vests in a truck filled with stolen U.S.M.C. merchandise, the NCIS team attempts to locate both the source and any vests that had been shipped to military personnel overseas.
The murder of a port authority officer reveals Parsa's possible whereabouts, as the team continues their tireless hunt. Meanwhile, Bishop reveals her past association with the elusive terrorist.
In an effort to find the terrorist Parsa, Gibbs and the NCIS team track down one of his cohorts using evidence from the drone attack. Meanwhile, an emotionally shaken McGee struggles with the ramifications of the incident.
When a stolen drone is linked to the elusive terrorist Parsa, the NCIS team partners with the Department of Defense, including Gibbs' former girlfriend Hollis Mann, to track down the device before it is used for a large scale attack. Meanwhile, McGee hesitates to ask for time off to attend a black-tie gala honoring his girlfriend. Susanna Thompson guest stars.
After a mysterious illness strikes children from military families, Gibbs and the team investigate the cause. Meanwhile, Abby and Jimmy partner with the Naval Medical Research Center to determine the strain of illness, all in hopes of delivering a cure before the holidays. Also, Director Vance struggles with forgiveness as his estranged father-in-law makes a surprise visit to his home. Meredith Eaton and Ben Vereen guest star.
Complications arise when the NCIS team discovers a link between a murder victim and the current boyfriend of Gibbs and Agent Fornell's ex-wife. Meanwhile, NSA Analyst Ellie Bishop adjusts to joining the NCIS team. Joe Spano and Melinda McGraw guest star.
After discovering the Secretary of the Navy was bugged during a confidential briefing, NSA Analyst Eleanor "Ellie" Bishop, who predicted the security breach in exact detail two years ago, partners with the NCIS team on the case. Emily Wickersham joins the NCIS team as NSA Analyst Eleanor "Ellie" Bishop.
The NCIS team is forced to re-examine a hit-and-run murder case when a former FBI agent turned lawyer confides in Gibbs that her client's confidential alibi is solid. Meanwhile, McGee grows suspicious of Tony's strange behavior.
After Gibbs leaves mid-case to help his father reconnect with a former war pilot, Tony and McGee argue over who should run lead on the team's investigation into the murder of a Marine Sergeant. Ralph Waite guest stars as Jackson Gibbs.
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. Diane Neal guest stars as Special Agent Abigail Borin.
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. Margo Harshman guest stars as Delilah Fielding.
Gibbs and McGee travel to Afghanistan when a murder case leads them to an Afghan women's shelter Mike Frank's secretly supported for years. Muse Watson guest stars as Mike Franks.
The NCIS team must rely on Twitter for a case involving a missing Navy Lieutenant. Meanwhile, McGee misplaces his badge but withholds the information from Gibbs and the authorities. Roma Maffia guest stars as NCIS Special Agent Vera Strickland.
Determined to locate Ziva, Tony chases leads in Israel in search of her current whereabouts. Meanwhile, Gibbs and the team continue the hunt for Parsa and his growing terrorist ring. Joe Spano guest stars as Senior FBI Agent T.C. Fornell.
An explosion at a D.C. event that results in a casualty connected to the agency changes Parsons' perspective on Gibbs and the NCIS team. Guest stars include Colin Hanks as Department of Defense IG Investigator Richard Parsons and Joe Spano as Senior FBI Agent T.C. Fornell.
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