Cast Main Mark Harmon as Leroy Jethro Gibbs, NCIS Supervisory Special Agent (SSA) assigned to Washington's Navy Yard Pauley Perrette as Abigail Sciuto, Forensic Specialist attached to NCIS Sean Murray as Timothy McGee, NCIS Senior Special Agent, second in command Wilmer Valderrama as Nicholas "Nick" Torres, NCIS Special Agent Emily Wickersham as Eleanor "Ellie" Bishop, NCIS Special Agent Brian Dietzen as Dr. Jimmy Palmer, Assistant Medical Examiner for NCIS Duane Henry as Clayton Reeves, SIS Senior Officer, NCIS International Desk Agent Rocky Carroll as Leon Vance, NCIS Director David McCallum as Dr. Donald Mallard, Chief Medical Examiner for NCIS Maria Bello as Dr. Jacqueline "Jack" Sloane, NCIS Special Agent and operational psychologist (episode 4–24) Recurring Joe Spano as Tobias Fornell, Former FBI Senior Special Agent Robert Wagner as Anthony DiNozzo Sr. (Tony DiNozzo's father) Jack Conley as Danny Sportelli, Metro P.D. Detective Sergeant Margo Harshman as Delilah Fielding, Department of Defense intelligence analyst (McGee's wife) French Stewart as Paul Triff, imprisoned serial killer Laura San Giacomo as Dr. Grace Confalone Marco Sanchez as Alejandro Rivera Pej Vahdat as Nigel Hakim, British Humanitarian Sumalee Montano as Nicole Taggart, NCIS Special Agent Diona Reasonover as Kasie Hines, Forensic Scientist attached to NCIS Naomi Grace as Kyla Vance (Leon Vance's Daughter) Hilliary Ward as Jessica Shaeffer, Defense Attorney Guest appearances Patrick Labyorteaux as Bud Roberts, JAG Captain from Falls Church Muse Watson as Mike Franks, deceased Senior Special Agent for NCIS (Gibbs' old boss) Drew Carey as John Ross, retired Marine Sergeant Kevin Pollak as Albert Hathaway, convicted Investment Advisor Dan Lauria as Morgan Cade, Emergency Room Guard Trevor Donovan as Thomas Buckner, Navy Commander Susan Blakely as Cadence Darwin, Ducky's friend Gwendoline Yeo as NCIS Special Agent Joanna Wright Jake Busey as Whit Dexter, Radio Host Mike Wolfe as himself Don Lake as Phillip Brooks, Navy Captain Peter Jason as Robert King, Biological Weapons Specialist Episodes No. overall No. in season Title Directed by Written by Original air date Prod. code U.S. viewers (millions) 331 1 "House Divided" Tony Wharmby Steven D. Binder September 26, 2017 1501 13.29[9] The NCIS team continues their search for Gibbs and McGee two months after they went missing fighting rebels in Paraguay; Vance and Torres are summoned to a congressional hearing regarding the fallout from the Paraguay mission. 332 2 "Twofer" James Whitmore Jr. Scott Williams October 3, 2017 1502 13.50[10] The team investigates the murder of a Navy lieutenant, whose body is found hidden at a local cemetery; Gibbs and McGee must pass a psychiatric evaluation by Dr. Grace Confalone before officially resuming work. 333 3 "Exit Strategy" Terrence O'Hara Christopher J. Waild October 10, 2017 1503 13.30[11] 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 (Susan Blakely) presents him with a new opportunity during his guest lecture series. 334 4 "Skeleton Crew" Rocky Carroll Jennifer Corbett October 17, 2017 1504 12.85[12] Director Vance welcomes NCIS Special Agent 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. 335 5 "Fake It 'Til You Make It" Thomas J. Wright David J. North October 24, 2017 1506 13.30[13] After Reeves sees a friend from an AA meeting get kidnapped, the NCIS team discovers the primary suspect disappeared two days ago with confidential military information. Meanwhile, an embarrassing photo from McGee's teenage years becomes a popular meme. 336 6 "Trapped" Bethany Rooney Brendan Fehily October 31, 2017 1505 12.11[14] 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. 337 7 "Burden of Proof" Dennis Smith Gina Lucita Monreal November 7, 2017 1507 13.47[15] 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. 338 8 "Voices" Tony Wharmby Steven D. Binder November 14, 2017 1508 13.08[16] After voices inside a woman's head lead her to the body of a contractor suspected of corruption, the team is requested to use her to figure out what happened only to find she may be hiding more than she realizes; McGee and Delilah disagree about finding out their child's gender. 339 9 "Ready or Not" Terrence O'Hara Scott Williams November 21, 2017 1509 12.54[17] The team tracks an elusive international arms dealer who recently murdered an MI5 officer; Abby races Delilah to the hospital when her labor starts three weeks early. Things gets more complicated when the arms dealer shows up at the same hospital Delilah and McGee are in. 340 10 "Double Down" Alrick Riley Christopher J. Waild December 12, 2017 1510 12.58[18] While Sloane and Torres protect a Congressman (and one of Gibbs' friends) in Afghanistan, the team investigates when his son suffers a damaging fall. 341 11 "High Tide" Tony Wharmby David J. North Steven D. Binder January 2, 2018 1512 14.10[19] 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. 342 12 "Dark Secrets" Bethany Rooney George Schenck Frank Cardea January 9, 2018 1511 14.24[20] 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. 343 13 "Family Ties" Rocky Carroll Brendan Fehily January 23, 2018 1513 13.97[21] After McGee and Torres visit the home of a high schooler who witnessed a hit and run, her parents flee with their daughter, leaving NCIS in the lurch. Also, Vance's daughter is arrested for shoplifting. 344 14 "Keep Your Friends Close" Mark Horowitz Gina Lucita Monreal February 6, 2018 1514 13.90[22] 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 (Kevin Pollak) when the victim is linked to his highly publicized trial. The episode ends in a cliffhanger, as Gabriel Hicks's lawyers' car is blown up, leaving Sloane in the middle of the road, unconscious. 345 15 "Keep Your Enemies Closer" Thomas J. Wright Jennifer Corbett February 27, 2018 1515 12.45[23] 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, the murderer who deceived Gibbs and Fornell 346 16 "Handle with Care" Alrick Riley Scott J. Jarrett Matthew R. Jarrett March 6, 2018 1516 12.92[24] Gibbs and the team work to clear the name of retired Marine Sergeant John Ross (Drew Carey) when cyanide is found in one of the hundreds of care packages he sends to active-duty Marines 347 17 "One Man's Trash" Michael Zinberg Scott Williams March 13, 2018 1517 13.26[25] Gibbs and Ducky see an antique war stick on television that could be the missing murder weapon to a 16-year-old cold case. Mike Wolfe guest stars as himself 348 18 "Death from Above" Rocky Carroll Christopher J. Waild March 27, 2018 1518 11.94[26] The NCIS headquarters are evacuated after the team discovers bomb materials on the roof of the squad room; the team reads the first draft of Ducky's book. 349 19 "The Numerical Limit" Leslie Libman David J. North Steven D. Binder April 3, 2018 1519 12.23[27] 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. 350 20 "Sight Unseen" Bethany Rooney Brendan Fehily April 17, 2018 1520 11.58[28] 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. 351 21 "One Step Forward" James Whitmore Jr. Gina Lucita Monreal May 1, 2018 1521 12.35[29] A daughter begs Gibbs to investigate her mother's murder because she believes the police convicted the wrong man. Abby receives a hard-to-get reservation at a new restaurant that is cold like an igloo. The episode ends in a cliffhanger, with a mugger cornering Abby and Reeves in an alley, pulling a gun and demanding money. Reeves hands over his wallet, but Abby offers to help, instead of giving up her purse. A single gunshot sounds. 352 22 "Two Steps Back" Michael Zinberg Jennifer Corbett May 8, 2018 1522 15.08[30] When evidence reveals an NCIS team member is a hitman's latest target, the (description exceeds maximum possible length)