After the body of a missing Navy commander is found, Vance orders Gibbs and the team to work with former FBI Agent Tobias “T.C.” Fornell, the private investigator who was hired to locate him. Also, Bishop and Torres interview convicted investment advisor Albert Hathaway when the victim is linked to his highly publicized trial.
After McGee and Torres visit the home of a high schooler who witnessed a hit-and-run, her parents, Christopher and Julie Bell, flee with their daughter, leaving NCIS in the lurch. Also, Vance’s daughter is arrested for shoplifting.
After a seemingly happy and successful Navy lieutenant appears to have taken her own life, Gibbs and the team conduct a thorough investigation, interviewing family and friends from her past and present.
Torres and Bishop go undercover as a criminal couple available for hire, during an NCIS sting operation tracking illegal drug-running out of the Norfolk civilian marina.
As Torres and Sloane run protection detail for U.S. Senator John Phillips in Afghanistan for the holidays, they must urgently return to the states after hearing the senator’s son is in the ICU. Also, Gibbs and the team investigate the altercation that caused the life threatening injuries to the senator’s son.
The team tracks an elusive international arms dealer who recently murdered an MI6 officer; Abby races Delilah to the hospital when her labor starts three weeks early.
An NCIS person of interest in a bribery and fraud case is found murdered after a runner is led to his body by a strange voice. Also, McGee and Delilah disagree on whether to find out the baby’s sex or keep it a surprise.
A convicted felon claims NCIS framed him for murder a decade ago, so Gibbs investigates and asks Ducky to conduct a new autopsy. Meanwhile, Senior FBI agent Fornell joins the probe, since he was the lead investigator in the original joint FBI and NCIS case.
A petty officer is found murdered on a golf course, and McGee spends hours on the victim’s ham radio trying to locate a key witness. Meanwhile, Palmer asks his co-workers to donate to a charity that builds playgrounds for kids of all abilities, and Torres surprises them with his generosity.
Reeves sees his friend get kidnapped and the investigation reveals the primary suspect disappeared two days earlier with confidential military information. Meanwhile, an embarrassing photo from McGee’s teen years becomes a popular meme.
NCIS Special Agent Jacqueline Sloane, a forensic psychologist, joins the team just as a horrific storm shuts down Washington, D.C. During the power outage, a sailor is kidnapped, and Torres and Bishop go out to sea to track evidence.
Torres’ partner mysteriously vanishes during a stakeout with Metro P.D. The investigation uncovers new evidence from a decade-old murder case. Meanwhile, Ducky’s friend, Cadence Darwin, presents him with a new opportunity during his guest lecture series.
NCIS investigates when the body of a murdered Navy lieutenant, who disappeared over a year ago, is found by a cemetery grounds crew while relocating caskets on the property. Meanwhile, Gibbs and McGee must pass a psych evaluation before they can officially resume working.
Season 15 begins with the NCIS team tirelessly searching for Gibbs and McGee two months after they were last seen fighting an elusive group of rebels in a Paraguay jungle. Meanwhile, Vance and Torres are summoned to a congressional hearing regarding the fallout from the Paraguay mission.
When a Navy SEAL vanishes during an unsanctioned trip, Gibbs, McGee and Torres travel to an unpopulated area in Paraguay that’s teeming with violent rebels.
The team suspects foul play when a healthy, young petty officer mysteriously dies in his sleep aboard a Navy destroyer. Wedding stress reaches its peak for McGee and his fiancée.
A gunnery sergeant’s murder in a national park lead the team to join forces with the mounted police. While investigating the clues, they uncover a disturbing smuggling ring.
A Marine’s murder has connections to a dirt bike gang that Torres joined while on an old undercover operation.
A vice admiral tasks McGee with tracking down the hackers who infected his laptop with ransomware before the virus wipes out all his data. The cyberterrorism escalates when the virus spreads to the whole NCIS office. Quinn’s family secret is revealed.
The team must rely on an irritable Vietnam War veteran to solve a Marine’s murder.
To carry out a sailor’s dying wish, Gibbs and the NCIS team reinvestigate a murder case that was originally ruled an accidental death. Also, the case reminds Torres of a tragic time from his past.
McGee discovers his apartment has been torn apart by a robber trying to locate an item of great value hidden somewhere by the convicted criminal who previously owned the unit. Also, Congresswoman Flemming (Mary Stuart Masterson) tries to persuade Director Vance to pursue a career in politics.
Bishop is more determined than ever to seek revenge for the murder of Qasim, her late boyfriend, after Gibbs and the team find a new lead in the Chen case. Also, Torres teaches the agents the art of pickpocketing.
After Abby’s homeland security think tank is compromised and she is found in possession of a real bomb, the NCIS team discovers the leader of the group has been murdered and a theoretical terror playbook has been stolen.
The murder of a Petty Officer in a small town outside D.C. prompts NCIS to once again work with “The Sherlocks,” a privately funded investigative team that includes their newest member, Anthony DiNozzo, Sr.
During an NCIS hit-and-run investigation, Palmer joins a stranger on the outside ledge of a building in an attempt to save his life.
When Gibbs spots the brother of an “NCIS Most Wanted” suspect, he takes the opportunity to assume his former alias and go undercover with their infamous anti-government militia. This leaves the NCIS team to piece together where and what Gibbs is up to. Meanwhile, Bishop and Reeves partner up on an off-the-books investigation.
NCIS searches for new leads after an undercover operation to apprehend a businessman who uses acts of terror to manipulate the stock market is compromised. Also, Bishop and Qasim find a break in the case together.
After the NCIS team tracks evidence from the murder of a Navy captain to Ducky’s deceased mother, Ducky looks back and questions a pivotal life choice he made 37 years ago. Also, the team exchanges holiday gifts, and Gibbs spends Christmas dinner with Fornell.
The NCIS team investigates a series of escalating threats against congresswoman Jenna Flemming, while Director Vance oversees her temporary protection detail.
After NCIS Agent Bishop is sent to Gitmo to gather evidence for a Navy chaplain murder case, she questions her previous work at the NSA. Also, Bishop’s brothers, John and Robert, visit for the Thanksgiving holiday and pester her co-workers to find out who she is dating.
Torres boldly breaks protocol when he learns a witness in an NCIS case is wanted by U.S. Immigration and Customs Enforcement. Also, Abby, Bishop and McGee woo landlord Tony DiNozzo Sr. in the hope of subletting Tony’s apartment.
After a kidnapped petty officer escapes her captor, NCIS uncovers a connection to her missing husband. Also, Abby knits the NCIS newbies personalized gifts.
When a missing MI6 Officer is linked to a murdered petty officer, Gibbs sends Quinn and Bishop to Philadelphia to work with MI6 Officer Clayton Reeves. Also, Quinn painfully recounts the NCIS case that made her leave field work.
After the body of a navy lieutenant is discovered aboard a destroyer during a tiger cruise, when civilian guests are allowed to spend the night on the ship, Gibbs, Quinn and Palmer travel out to sea to investigate. Also, McGee contemplates the perfect proposal for Delilah Fielding.
When the NCIS team investigates a marine sergeant’s tragic fall from a building, her doctor, Grace Confalone, confides in Gibbs and suggests he treat it as a murder investigation. Also, Torres searches for a place to live.
NCIS uncovers a bomb plot and a long-running theft ring while investigating a death at a Quantico reunion. Also Torres and Quinn adjust to life on Gibbs’ team, including new seating arrangements in the squad room.
The NCIS team investigates a deadly car explosion in D.C. that connects to NCIS Special Agent Nicholas “Nick” Torres, who disappeared six months ago while on a deep undercover assignment in Argentina. Also, Gibbs asks NCIS Special Agent Alexandra “Alex” Quinn to shadow his team after rejecting eight agents she instructed and referred for the open position.
NCIS, FBI and MI6 continue an international manhunt for an escaped British spy who is targeting current and former agents.
The NCIS team, alongside the FBI and MI6, continue an international manhunt for an escaped British spy who has left one colleague fighting for their life in ICU.