Episode 1 : House Divided
Two months after Gibbs and McGee were last seen fighting an elusive group of rebels in a Paraguay jungle, the NCIS team in D.C. tirelessly searches for their missing colleagues. Also, Vance and Torres are summoned to a congressional hearing regarding the fallout from the Paraguay mission, on the 15th season premiere of NCIS.
Episode 2 : Twofer
NCIS is called in to investigate when the body of a missing Navy Lieutenant who disappeared a year and a half ago is located by a cemetery grounds crew while they are relocating caskets on the property. Also, Gibbs and McGee must pass a psych evaluation with Doctor Grace Confalone (Laura San Giacomo) before officially resuming all work responsibilities.
Episode 3 : Exit Strategy
While on a stakeout with Metro P.D., Torres' partner mysteriously vanishes, with the subsequent investigation leading NCIS to uncover new evidence from a decade-old murder. Also, Ducky's friend, Cadence Darwin (Susan Blakely), presents him with a new opportunity during his guest lecture series.
Episode 4 : Skeleton Crew
Director Vance welcomes NCIS Special Agent Jacqueline ?Jack? Sloane (Maria Bello), a forensic psychologist he lobbied to transfer from California, to headquarters. Also, in the midst of a storm that has shut down Washington, D.C. and knocked out power, the NCIS team investigates the kidnapping of a sailor, which sends Torres and Bishop out to sea to track evidence.
Episode 5 : Fake It 'Til You Make It
After Reeves sees his friend get kidnapped, the NCIS team discovers the primary suspect disappeared two days ago with confidential military information. Also, an embarrassing photo from McGee?s teenage years becomes a popular meme.
Episode 6 : Trapped
After a petty officer is found murdered on a golf course, McGee spends hours on the victim's ham radio trying to locate a key witness. Also, 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.
Episode 7 : Burden of Proof
After a convicted felon swears the NCIS agency framed him for murder a decade ago, Gibbs begins his own investigation, starting with a new autopsy by Ducky. Also, Senior FBI Agent Fornell (Joe Spano) joins the team, since he was the lead investigator in the original joint FBI and NCIS case.
Episode 8 : Voices
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.
Episode 9 : Ready or Not
The team's Thanksgiving plans are put on hold while they track an elusive international arms dealer in D.C. who recently murdered an MI6 officer who was Sloane's close friend. Also, Abby races Delilah (Margo Harshman) to the hospital when her labor starts three weeks early.
Episode 10 : Double Down
As Torres and Sloane run protection detail for U.S. Senator John Phillips (James Morrison) 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.
Episode 11 : High Tide
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.
Episode 12 : Dark Secrets
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. Patrick Labyorteaux guest stars.
Episode 13 : Family Ties
After McGee and Torres visit the home of a high schooler who witnessed a hit and run, her parents, Christopher (Jamie Kaler) and Julie Bell (Gabrielle Carteris), flee with their daughter, leaving NCIS in the lurch. Also, Vance's daughter is arrested for shoplifting.
Episode 14 : Keep Your Friends Close
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. Joe Spano and Kevin Pollak guest star.
Episode 15 : Keep Your Enemies Closer
NCIS strikes a deal with convicted murderer Paul Triff (French Stewart), 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 (Graham Hamilton), the murderer who deceived Gibbs and Fornell (Joe Spano).
Episode 16 : Handle with Care
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. THE PRICE IS RIGHT host Drew Carey guest stars.
Episode 17 : One Man?s Trash
Gibbs and Ducky see an antique war stick on television that could be the missing murder weapon to a 16-year-old cold case.
Episode 18 : Death from Above
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.
Episode 19 : The Numerical Limit
Gibbs is granted protective custody of a 10-year-old orphaned refugee, Elena (Lily Rose Silver), when an NCIS case reveals she is the target of a violent gang.
Episode 20 : Sight Unseen
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 (Marilee Talkington), a key blind witness who heard vital evidence needed to solve the case.
Episode 21 : One Step Forward
Sara Carter (Skye P. Marshall) begs Gibbs to investigate her mother?s murder as she believes the local authorities convicted the wrong man. Also, Abby is awarded a dinner reservation for two to a brand-new five-star restaurant in an igloo and has to decide which coworker deserves to go with her.
Episode 22 : Two Steps Back
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.
Episode 23 : Fallout
While Gibbs attends the memorial service for a friend who was lost at sea, he discovers that the deceased, Navy Captain Phillip Brooks (Don Lake), has been hiding in a fallout shelter after his boat was attacked and he swam to shore. Susan Walters guest stars as Marcy Brooks, the Commander's wife.
Episode 24 : Date with Destiny
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. Now, Vance and Gibbs fear Sloane is willing to risk everything to destroy him, on the 15th season finale.