The team in D.C. frantically uses every asset and inter-agency contact they have in an attempt to locate their missing team members, on the 12th season premiere.

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.

When an NCIS case reveals a connection to Ducky's estranged childhood best friend, he and Special Agent Bishop travel to London for interviews with family and co-workers of his friend.

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.

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.

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.

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.

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.

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.

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.

The NCIS team must investigate a series of crime scenes that appear to be copy-cats of previous cases. Also, two of Gibbs' ex-wives, one of which the team has yet to meet, show up at a crime scene to discuss something important with him.

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.

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 a NCIS baby shower.

DiNozzo returns to the military academy he attended as a teenager after a murdered Marine and alumni of the school is found clutching the photo of a current student. ?Also, Bishop and her husband invite Gibbs and the team out for a special dinner.

The NCIS team suspects Gibbs' arch-nemesis is behind an explosion at a summit for global terror event, but 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.

A covert identity created for one of Gibbs' undercover cases 20 years ago resurfaces after a murder victim is found living under the alias.

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.

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.

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.

DiNozzo is partnered with his girlfriend ATF Special Agent Zoe 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."

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.

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. Matt Jones and Jamie Bamber guest star.

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, on the 12th season finale of NCIS.

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, on the 12th season finale of NCIS.