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.

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.

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 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.

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.

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.

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.

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.

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.

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.

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.

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.

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 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.

NCIS strikes a deal with convicted murderer Paul Triff, giving him a 48-hour furlough at his former residence, now McGee's home, in exchange for information that can convict his former cellmate, Gabriel Hicks, the murderer who deceived Gibbs and Fornell.

Gibbs and the team work to clear the name of retired Marine Sergeant John Ross when cyanide is found in one of the hundreds of care packages he sends to active-duty Marines.

Gibbs and Ducky are watching TV when they see the host handling a 200-year-old war stick that could be a match from a decade-old cold case.

The NCIS headquarters are evacuated after the team discovers a body as well as bomb materials on the roof of the squad room. Also, the team reads the first draft of Ducky’s book.

Gibbs is granted protective custody of a 10-year-old orphaned refugee, Elena, when an NCIS case reveals she is the target of a violent gang.

NCIS searches for a petty officer suspected of assault who escapes when the sheriff transporting him crashes into a lake. Also, Torres works closely with Annie Barth, a key blind witness who heard vital evidence needed to solve the case.

Sara Carter begs Gibbs to investigate her mother's murder; she believes the wrong man was convicted; Abby is awarded a dinner reservation for two to a new five-star restaurant in an igloo and has to decide which co-worker deserves to go with her.

When evidence reveals an NCIS team member is a hitman’s latest target, the team must search through old case files to determine who is seeking vengeance.

While Gibbs attends the memorial service for a friend who was lost at sea, he discovers that the deceased, Navy Captain Phillip Brooks, has been hiding in a fallout shelter after his boat was attacked and he swam to shore.

Sloane is adamant that a man who held her hostage and tortured her years ago in Afghanistan, and was believed to have been killed following her rescue, is alive and in D.C. Also, Vance and Gibbs fear Sloane is willing to risk everything to destroy this man.

One month after Director Vance was kidnapped, Gibbs is assigned the role of acting director in his absence while the team searches worldwide for his whereabouts.

After a Navy lieutenant is found murdered in his hot tub, the team interviews several families in the victim’s peculiar neighborhood. Also, Torres must face the consequences after a volatile night out with Palmer.

One of the NCIS agents is starstruck after the team investigates an explosion outside the home of Navy Petty Officer First Class Todd Nicholas and his wife, popular reality TV star Sheba Nicholas. Also, Vance continues physical therapy for the injuries sustained when he was held hostage.

Gibbs’ quiet vacation at his remote cabin is interrupted by a surprise visit from Tobias Fornell and Navy Captain Phillip Brooks, as well as a call from NCIS asking for his help locating a robber hiding in the woods near him.

After a 50-year-old tape recording left by a murder victim is found, the NCIS team tries to exonerate Ray Jennings, the Marine serving a life sentence for the crime.

After NCIS arrives at a Halloween crime scene, Torres recognizes the victim as a friend from federal law enforcement training. Also, Jimmy thinks his lab is haunted by ghosts after objects keep mysteriously moving.

After a mural by a street artist and activist is stolen, the NCIS investigation leads to a conspiracy regarding a Navy contractor and the safety of ocean mammals. Also, Bishop shares a special connection with the street artist.

McGee and Bishop travel to Afghanistan after a murder case in the states is linked to a string of soldiers killed by friendly fire overseas. Also, Kasie leaves the lab and accompanies Torres into the field to process additional forensic evidence.

When the lead suspect of an unsolved and high-profile robbery case is released from prison, the NCIS team resumes their investigation with an undercover stakeout.

The team’s holiday plans are put on hold when the murder investigation of a Navy veteran includes the discovery of a newborn baby who has no identification and no apparent ties to a family.

United States Secretary of Defense Wynn Crawford shuts down Gibbs' murder investigation and demands that Special Agents McGee and Torres be arrested for their actions in the case.

An old family friend, Army Corporal John Sydney, beseeches Gibbs to join him on a road trip to search for a missing military I.D. bracelet. Also, a Navy Lieutenant in NCIS protective custody is poisoned by an infamous drug dealer.

After a malnourished and confused 9-year-old is found hiding in a storage unit, NCIS reopens an old missing persons case when the girl is believed to be the daughter of a Navy recruit who disappeared 10 years ago. Also, Bishop discovers notes that Special Agent Ziva David kept on the case long after NCIS officially stopped investigating.

McGee reluctantly visits his high school after the unique computer password he used as a teenager is linked to the murder of a department of defense contractor. The case escalates when an intruder breaks into McGee’s home in an attempt to steal his archaic high school computer.

The NCIS team investigates a man overboard fatality from a Navy destroyer at sea. Also, Torres is frustrated with Vance’s assignment to mentor three high school students.

Jimmy is torn between family and work after his father-in-law, Ed, asks him to tamper with evidence from NCIS’ current murder investigation. Also, Ed’s poker buddy, Anthony DiNozzo, Sr., offers to help with the case.

Director Vance is notified by the Pentagon that the nuclear submarine Gibbs and Bishop are aboard to conduct a murder investigation has gone radio silent.

Torres relies on his team's investigative skills after he wakes up on a dilapidated fishing boat and is covered in blood and unable to remember the last 12 hours.

Following an active shooter lockdown at a naval hospital, the team searches for a suspect who fled the scene; someone from Sloane's past is a key witness in the case.

NCIS investigates the murder of a Marine Major believed to have been killed in the 9/11 attack on the Pentagon after human remains are discovered at a construction site. A personal history with the victim drives Gibbs to solve her crime.

After entering cold case DNA into the system, Kasie solves a 30-year-old murder case, but a loophole in the legal system may set the suspect free. Also, McGee visits an elite technology company in Silicon Valley that is offering him a highly paid position.

After NCIS finds a secret government bank account that’s funding a nationwide network of vigilante justice, the team must determine who is acting as judge and jury.

The NCIS team investigates the murder of a Marine Sergeant in the States who was hailed as a war hero for his efforts overseas. Also, Gibbs turns to Doctor Grace Confalone for advice after he uncharacteristically unravels and abandons his team at a crime scene investigation.

Former FBI Agent Tobias Fornell pleads with Gibbs to do whatever is necessary to take down drug dealers and suppliers in the area after his daughter, Emily Fornell, is hospitalized from an opiate overdose. Gibbs is haunted by the personal aspects of the case and his history with vigilante justice.

Ziva surprises Gibbs with a cryptic warning, prompting him to question why she remained underground for years while being presumed dead by family and friends, and what led to her return.

With their lives in danger, Gibbs and Ziva’s rogue investigation takes an unexpected turn when a possible terrorist plot is revealed.

After the body of a Marine Lieutenant is found hidden under an 18-wheeler, the NCIS team tracks the vehicle’s previous locations to pinpoint the crime scene and suspect. Also, Sloane encourages the team to sit down and talk about Ziva’s recent reappearance.

The NCIS team links a bizarre crime scene at Arlington National Cemetery to a string of attacks on homeless veterans. Also, Vance orders McGee, Bishop and Torres to complete hours of evidence garage cleanup duty for withholding information.

NCIS investigates Marine Corporal Laney Alimonte after evidence suggests she murdered her neighbor while being treated for insomnia by a hypnotherapist. Also, Gibbs befriends his new neighbors after the 9-year-old’s baseball crashes through his window.

After a petty officer’s son is found murdered at his “welcome home from prison” party, evidence suggests Kasie’s lifelong best friend, Dante Brown, is the suspect.

While investigating a Marine’s murder, the NCIS team uncovers a labyrinth of live-streaming spy cameras hidden in the rooms of a Virginia motel.

The NCIS team investigates the murder of a musician in the Navy’s most elite band that performs at diplomatic events around the world.

The NCIS team investigates a petty officer's murder that was livestreamed on a popular gaming app; Gibbs watches his 11-year-old neighbor when his mom must leave on a last-minute trip.

Gibbs and the team help Ziva with the "one thing" she said she'd take care of before returning to her family.

Gibbs must face the consequences of helping Ziva with "the one thing" she said she'd take care of before returning to her family.

The NCIS team investigates an F-18 crash and the subsequent disappearance of the pilot; McGee reluctantly discusses a very personal decision with his teammates.

After a body is found at an unmanned aerial vehicle testing site, the NCIS team must determine if the death was murder or an accident. Also, Palmer carefully interviews medical examiner assistant candidates

After Torres and Bishop are victims of a hit-and-run, Torres fights for his life in the Intensive Care Unit.

The lead suspect in an NCIS murder investigation is a woman Gibbs' friend, Phillip Brooks, met on a dating site. Also, Sloane has a secret admirer on Valentine's Day.

While investigating the suicide of a retired Navy officer who left a rare, valuable - and possibly stolen - coin to the National Museum of the Navy, the team imagines themselves in his life story in order to piece together how the coin ended up in his possession.

As the NCIS team investigates the death of a Navy officer murdered the same way as his parents a decade ago, they stumble across a storage container filled with dollhouses that display recreations of murder scenes. The team agrees to clean out their living spaces, but some have a harder time saying goodbye to their possessions than others.

The team searches for answers when the body of a well-regarded Navy technician in the Reserves is found floating in a lake where a popular community event is being held. Sloane is caught off-guard when her daughter makes an unexpected request.

When Kasie and Jimmy are held hostage in a diner after a jewelry store robbery goes awry, they attempt to keep the other customers safe from the thieves.

The team tries to verify the identity of Joe Smith, who claims he served on the U.S.S. Arizona during the attack on Pearl Harbor, and wants to be buried there upon his death.

Gibbs and Fornell attempt to track down the leader of a drug ring who supplied drugs to Fornell's daughter. Also, the team deals with the case of a missing cadaver from the NCIS autopsy room.

Flashbacks reveal the murder case that first introduced young Gibbs to NCIS and his introduction to young, new-to-America Ducky.

The discovery of two dead bodies leads the NCIS team into the wild world of modern-day treasure hunting. Also, Gibbs and Fornell get deeper into their search for the opioid kingpin.

McGee and his wife Delilah's (Margo Harshman) Bahamian vacation turns into a high-stakes mission when a case NCIS is tracking of a dead escape room manager has ties to the island. Also, Gibbs fears the worst when his search for Fornell leads to blood.

Gibbs and Fornell's crusade to find the head of the drug ring responsible for Fornell's daughter Emily's overdose comes to a climax. Also, Gibbs and Vance finally let the team in on a case that has dangerous implications.

Following a tip about smuggled weapons, Bishop and Torres engage in a shootout in a former sheriff's residence that's now a historical site, only to find themselves locked in abandoned jail cells there.

NCIS investigates the murder of a Navy officer who was killed while driving home a recently released inmate. Also, Gibbs helps Palmer deal with a personal trauma.

When Sloane’s name is discovered in Afghanistan at the site of an abandoned bus with a dead driver, Gibbs accompanies her on a trip to find a group of girls who were kidnapped from the bus. McGee, Bishop and Torres track down a hacker who emailed compromising information to the Taliban.