第 12 季 共 24 集
播出时间：2014年9月24日
第 1 集 Twenty Klicks
播出时间：2014年9月24日
Gibbs and McGee travel to Russia to safely escort home an NCIS computer engineer connected to classified intel, but their mission is compromised and they are forced to go off the grid while hunted by a Russian mercenary group. Meanwhile, the team in D.C. frantically uses every asset and inter-agency contact they have in an attempt to locate their missing team members.
第 2 集 Kill the Messenger
播出时间：2014年10月1日
When a Navy Lieutenant is killed on his way to a private meeting with the President, the NCIS team must determine if the murder was part of a recent stream of muggings in the area or a targeted hit to keep intel secret.
第 3 集 So It Goes
播出时间：2014年10月8日
Flashbacks into his past help tell the tale for Dr. Mallard as he and Bishop travel to England in search of answers to find out why an Englishman murdered in the United States would have a list of deceased Navy men on his person.
第 4 集 Choke Hold
播出时间：2014年10月15日
The Secretary of the Navy assigns the NCIS team to a joint terrorism task force after a Naval research scientist is murdered and the lead suspect is wanted by the Russian government. In order to get a jump on the case, Gibbs has DiNozzo run interference with the leader of the task force, FBI Agent Leia Pendergast.
第 5 集 The San Dominick
播出时间：2014年10月22日
During a joint Coast Guard and NCIS training exercise at sea, Gibbs and CGIS Agent Borin spot a deceased man overboard, who is discovered to be a missing crew member from a ship 60 nautical miles away. Upon boarding the ship for questioning, Gibbs finds himself on a vessel that has been commandeered by pirates.
第 6 集 Parental Guidance Suggested
播出时间：2014年10月29日
The NCIS team must determine if the murder of a Navy commander's wife is linked to her profession as a therapist or an act of terrorism after finding the commander's name on a Jihadist target list. Meanwhile, the team discusses Halloween costumes and Tony's recent dating habits.
第 7 集 The Searchers
播出时间：2014年11月12日
After investigating the murder of a retired Master Sergeant, the NCIS team uncovers a fraudulent charity that preys on those searching for missing military personnel. Meanwhile, Bishop agonizes over the results of her probation evaluation, and Tony contemplates adopting stray cat that followed him home.
第 8 集 Semper Fortis
播出时间：2014年11月19日
While the NCIS team investigates the cause of a hit and run accident that resulted in the death of a Petty Officer, Gibbs searches for a way to clear a Navy Hospital Corpsman, who has served two medical tours in Afghanistan, after she's indicted for illegally providing medical aid to the victims of the crash, even though the surviving victims swear by her life-saving techniques.
第 9 集 Grounded
播出时间：2014年11月26日
While stuck at the Dulles airport due to inclement weather, DiNozzo, Bishop and her husband Jake work an NCIS case involving an elevated terrorist threat at Northeast airports during the Thanksgiving travel surge. Jamie Bamber guest stars.
第 10 集 House Rules
播出时间：2014年12月17日
The NCIS team consults with three cyber-terrorists they imprisoned after a city-wide Internet shutdown the week before Christmas. Also, McGee reflects on the case and Gibbs' infamous rules as he pens a heartfelt letter to his father.
第 11 集 Check
播出时间：2015年1月7日
The NCIS team investigates copy-cat crime scenes while Gibbs navigates two ex-wives relentlessly trying to get his attention.
第 12 集 The Enemy Within
播出时间：2015年1月14日
The NCIS team searches for a home-grown terrorist after a rescue mission in Syria reveals an American was involved in the capture of a social worker. Meanwhile, McGee and Bishop question DiNozzo’s unusual behavior.
第 13 集 We Build, We Fight
播出时间：2015年2月4日
Gibbs and the team investigate when a Navy lieutenant who is set to be the first openly gay servicemember to receive the Medal of Honor is murdered. Also, as his wife's due date approaches, Palmer prepares for fatherhood with an NCIS baby shower. Rocky Carroll makes his directorial debut.
第 14 集 Cadence
播出时间：2015年2月11日
DiNozzo returns to the military academy he attended as a teen after a murdered Marine, who was an alumnus of the school, is found clutching the photo of a current student. Meanwhile, Bishop and her husband invite Gibbs and the team for a special dinner.
第 15 集 Cabin Fever
播出时间：2015年2月18日
The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a global terrorism summit. Gibbs elects to sit out the investigation in order to help a grief-stricken Fornell, whose life is on the verge of imploding following his wife’s murder.
第 16 集 Blast from the Past
播出时间：2015年2月25日
A covert identity created for one of Gibbs’ undercover cases from 20 years ago resurfaces when a murder victim is found living under the alias.
第 17 集 The Artful Dodger
播出时间：2015年3月11日
Evidence in an NCIS murder case reveals a rare painting on loan had been swapped for a fake, prompting DiNozzo, Sr. to share his knowledge and contacts of the black market art world with the team.
第 18 集 Status Update
播出时间：2015年3月25日
After the body of a thief is found in a Marine’s house, NCIS discovers the calling card of a terror group Delilah and the Department of Defense have been tracking.
第 19 集 Patience
播出时间：2015年4月1日
The murder of a petty officer sparks a lead in a 40 year old airport bombing cold case that Gibbs and DiNozzo have been assigned to for the past two years. Also, McGee is jealous that he was not previously briefed on the cold case.
第 20 集 No Good Deed
播出时间：2015年4月8日
DiNozzo is partnered with his girlfriend ATF Special Agent Zoé Keates after evidence reveals that the murder weapon in an NCIS case was originally purchased for the controversial ATF sting operation “Operation Fast and Furious.” Also, Anthony DiNozzo Sr. returns to town for a special dinner to meet his son’s girlfriend.
第 21 集 Lost in Translation
播出时间：2015年4月15日
Gibbs and Bishop travel to Afghanistan after the murder of a Marine in D.C. is linked to a terror group holding another Marine hostage overseas. Also, DiNozzo is upset that McGee was chosen to be the new face of NCIS for all recruitment brochures,
第 22 集 Troll
播出时间：2015年4月29日
Special Agent Ned Dorneget from NCIS cyber operations assists the team when a Navy ensign who worked in the Office of Naval Intelligence is murdered. Also, the team discovers that Jake and Gibbs have become good friends.
第 23 集 The Lost Boys
播出时间：2015年5月6日
The NCIS cyber case turns into a united global effort after evidence confirms “The Calling,” an international terrorist group that recruits children through the internet, has been purchasing S-bombs off the black market.
第 24 集 Neverland
播出时间：2015年5月13日
NCIS feverishly investigates a global terrorist group that is recruiting teens via the Internet, following a deadly bombing overseas that results in an emotional and surprising loss for the team.
