It's Christmas time and Tony DiNozzo can't decide if he'll be naughty or nice when his dad, Anthony DiNozzo, Sr., comes to town for a visit. Robert Wagner guest stars.
Gibbs teams up with FBI Agent Fornell (Joe Spano) on a joint NCIS/FBI investigation after Fornell becomes the target of a shooting, but they face an unexpected twist in the case when their mutual ex-wife, Diane Sterling (Melinda McGraw), gets involved. Meanwhile, rumors run wild among the group after Diane stays overnight at McGee's.
As the NCIS team investigates a teenage girl's abduction, Ziva and Abby work closely with her young friend who witnessed the kidnapping. As the investigation unfolds, Gibbs seeks help from a past contact, Miranda Pennebaker (Alex Kingston), a well-connected woman with questionable morals.
Gibbs continues to work with Captain Wescott (Brad Beyer) while he retraces his steps in order to help the NCIS team track down a terrorist.
When a Navy Lieutenant who recently returned home from the Middle East is found dead from a brutal attack, the NCIS team questions the victim's friend, Marine Captain Joe Wescott (Brad Beyer).
A petty officer is gunned down in a billionaire's Ferrari and the investigation leads the NCIS team to discover a link to a man Gibbs was named after. Billy Dee Williams guest stars and Ralph Waite reprises his roll as Gibbs' father.
When a helicopter crew is adrift at sea and later discovered onshore, the NCIS team must determine the cause of the crash and locate the missing pilot. Meanwhile, Tony and McGee channel their inner "Maverick" and "Iceman," a la "Top Gun," and Ziva challenges them to a dare. Diane Neal reprises her role as CGIS Agent Abigail Borin.
While on medical leave, Ducky orders the exhumation of a Navy commander's body from a case closed 12 years ago. As a result, Gibbs tasks Ducky with a slightly different role on the investigation. Meanwhile, the NCIS team investigates the recent death of a Marine. As both cases unfold, the team begins to question whether the two are somehow connected. Michael Des Barres guest stars.
When the body of a missing NCIS facilities manager is found four months after disappearing on the day of the Navy Yard bombings, the NCIS team is assigned to investigate the strange case for one of their own. Meanwhile, the team is required to complete mandatory psych evaluations with a crisis counselor, and Gibbs is most concerned about Abby's recurring nightmares since the bombing.
Harper Dearing's latest act of terrorism ripped through NCIS headquarters in last season's cliffhanger finale, sparking a cross-agency manhunt for the criminal mastermind on the 10th season premiere of NCIS (Richard Schiff guest stars).
The NCIS team surveys the damage from the terrorist bombing. The team continues their search for Harper Dearing, for whom Gibbs invokes a "poke the bear" strategy after realizing that Dearing has nothing left to lose. Despite fearlessly pushing forward in their professional lives, the NCIS team struggle with the aftermath of the bombing. Gibbs helps Abby cope with the psychological aftermath by encouraging her to connect with her recently discovered biological brother, as he struggles with family dynamics himself, reconnecting with his father's best friend, the man he was named after.
Terrorism threatens to shake the foundation of the Navy and NCIS when the team continues to be eluded by the newest member of the NCIS Most Wanted wall. Meanwhile, Jimmy Palmer's destination wedding is impacted by the case.
The NCIS team analyzes what secrets could be in the hands of a terrorist targeting the NAVY, when a high-tech bug is found inside a probationary agents tooth. Meanwhile, the festivities for Jimmy Palmer's upcoming wedding continue with the bachelor party.
The NCIS investigation of a fire on a Navy vessel reveals evidence that elevates security at all US Navy facilities worldwide. Meanwhile, DiNozzo and Ziva travel to Italy when an explosive device is found hidden on a Navy ship.
After a warehouse fire reveals missing Navy documents, posing a potential threat to national security, the NCIS team joins the Baltimore P.D. investigation, reuniting Tony with a boy from his past.
Following the murder of a Marine, Tony and Ziva join Ziva's longtime friend and mentor (guest star Karina Lombard) in Colombia in a search for a missing Marine Lieutenant and Navy Chaplain. Meanwhile, Jimmy Palmer decides who will be his best man. Jamie Lee Curtis also guest stars.
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