Original air date: 09/26/2017 Runtime: 42:43 min. 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.
Original air date: 10/03/2017 Runtime: 43:25 min. 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.
Original air date: 10/10/2017 Runtime: 43:28 min. 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.
Original air date: 10/17/2017 Runtime: 43:23 min. 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.
Original air date: 10/31/2017 Runtime: 42:16 min. 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.
Original air date: 11/07/2017 Runtime: 43:29 min. 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.
Original air date: 11/21/2017 Runtime: 40:35 min. 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.
Original air date: 12/12/2017 Runtime: 43:02 min. 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.
Original air date: 01/09/2018 Runtime: 41:10 min. 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.
Original air date: 01/23/2018 Runtime: 43:20 min. 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.
Original air date: 02/06/2018 Runtime: 43:31 min. 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.
Original air date: 02/27/2018 Runtime: 43:37 min. 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).
Original air date: 04/17/2018 Runtime: 43:23 min. 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.
Original air date: 05/01/2018 Runtime: 42:43 min. 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.
Original air date: 05/15/2018 Runtime: 43:05 min. 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.
Original air date: 05/22/2018 Runtime: 43:17 min. 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.