Following the bombing of NCIS headquarters, the team engages in a cross-agency manhunt for Harper Dearing.
The team investigates when the body of an NCIS facilities manager is found four months after she went missing; as the team faces mandatory psych evaluations, Gibbs is concerned about Abby's recurring nightmares.
Ducky orders the exhumation of a body from a 12-year-old case; the team investigates a Marine's death.
When a helicopter crew's training mission ends in a disastrous crash, the NCIS team must figure out what happened and find the missing pilot; Ziva challenges McGee and Tony to a dare.
When a petty officer is shot in a billionaire's car, the investigation leads the team to Gibbs' namesake.
When a Navy lieutenant is killed in a brutal attack shortly after returning home from the Middle East, the team questions the victim's friend, a Marine captain with post-traumatic stress disorder.
Capt. Wescott continues to help the team track a terrorist; Abby is excited about the NCIS Thanksgiving dinner; Tony is curious when he learns that Ziva is making special plans.
As the team searches for an abducted teenager, Abby and Ziva work closely with a friend of the girl who witnessed the kidnapping; Gibbs turns to a former contact for help; Tony is jealous when Ziva makes plans with another man.
When FBI Agent Fornell becomes the target of a shooting, he and the NCIS team launch a joint investigation; rumors run wild when Diane, the ex-wife of both Gibbs and Fornell, spends the night at McGee's.
Tony's father (Robert Wagner) visits for Christmas; as the team tackles a murder investigation, Abby can't contain her excitement over holiday festivities.
As the team investigates a connection between a dead journalist and a Navy petty officer, Ziva is surprised by a visit from her father (Michael Nouri).
After an event that hits close to home, the team unites to find answers and protect vulnerable colleagues.
The investigation into a car accident that killed a Marine and a young woman brings up upsetting childhood memories for Abby; Ducky says the crash may not have been an accident.
The NCIS team finds an infamous hacker who could lead them to the world's most wanted cyber terrorist.
While on leave as he mourns the loss of his wife, Director Vance uncovers information that makes him question everything.
When Jimmy and Ducky disappear while transporting a body from a crime scene, the team races to find them.
Gibbs' barber asks for help when he suspects his son is involved in a high-profile crime; the team looks into the disappearance of Navy funds.
A woman asks the NCIS team to investigate the death of her husband, a Marine who specialized in K-9 bomb detection; Vance interviews nannies.
The team investigates a murder on a U.S. Navy ship; tension rises when McGee learns that his estranged father is one of the suspects.
A Navy reservist asks the team for help when she realizes her husband is missing and her living room is covered in blood; Tony thinks Ziva is planning to avenge her father's death.
As the team investigates a Mossad officer's murder in Virginia, Tony and Ziva pursue her father's killer.
Ignoring orders from Homeland Security, the team searches for Bodnar in order to avenge the murders of Eli David and Jackie Vance.
An investigator (Colin Hanks) from the Department of Defense scrutinizes the team's response to the Bodnar case; the team must determine whether a petty officer is suffering from paranoia when he claims he is being followed.