NCIS stands for Naval Criminal Investigative Service. The series chronicles the operations of an elite team of special agents whose mission is to investigate any crime that has a shred of evidence connected to Navy and Marine Corps personnel, regardless of rank or position.
Ziva surprises Gibbs with a cryptic warning, prompting him to question why she remained underground for years while being presumed dead by family and friends.
With their lives in danger, Gibbs and Ziva's rogue investigation takes an unexpected turn when a possible terrorist plot is revealed.
NCIS team members search a missing Marine's campsite and realise he was not alone, so they search for his camping partner, a woman who may still be alive. (S17 Ep3)
The team links a bizarre crime scene at Arlington National Cemetery to a string of attacks on homeless veterans (S17 Ep4)
NCIS investigates a Marine Corporal after evidence suggests she murdered her neighbour while being treated for insomnia by a hypnotherapist; Gibbs befriends his new neighbours. (S17 Ep5)
When the son of a petty officer is murdered in his prison home, evidence suggests that Kasie's lifelong best friend, Dante Brown, is the suspect. (S17 Ep6)
While investigating a Marine's murder, the NCIS team uncovers a labyrinth of live-streaming spy cameras hidden in the rooms of a Virginia motel. (S17 Ep 7)
The team investigates the murder of a musician who played in the Navy's best band, which, among other things, performs at diplomatic events around the world. (S17 Ep8)
The NCIS team investigates a petty officer's murder that was livestreamed on a popular gaming app; Gibbs watches his 11-year-old neighbor when his mom must leave on a last-minute trip (S17 Ep9)
Gibbs and the team assist Ziva with 'the one thing' she said she would need to take care of before returning to see her family (S17 Ep10)
Gibbs is forced to face the consequences of his actions after helping Ziva deal with the one thing she wanted to finish before reuniting with her family. (S17 Ep11)
The NCIS team gears up when the pilot of an F-18 disappears after crashing the plane; McGee hesitates to talk about something personal with his teammates. (S17 Ep12)
A dead body is found at a testing site for unmanned aerial vehicles; Palmer takes careful consideration while interviewing for a medical examiner assistant. (S17 Ep13)
Torres fights for his survival in the ICU after he and Bishop become victims of a hit-and-run. (S17 Ep14)
The lead suspect in a murder investigation is a woman that Gibbs' friend, Phillip Brooks, met on a dating site; Sloane has a secret admirer on Valentine's Day (S17 Ep15)
The team investigate the suicide of a retired Navy officer who left a rare, valuable - and possibly stolen - coin to the National Museum of the Navy. (S17 Ep16)
Evidence in an NCIS murder case reveals a rare painting on loan has been swapped for a fake, prompting DiNozzo Sr to share his knowledge and contacts of the black market art world . (S17 Ep17)
The body of a well-regarded Navy technician is found floating in a lake, which isn't far from where a popular community event takes place. Sloane's daughter has an unexpected request. (S17 Ep18)
Kasie and Jimmy are held hostage in a diner after a jewellery store robbery goes awry. (S17 Ep19)
The team tries to verify the identity of Joe Smith, who claims he served on the U.S.S. Arizona during the attack on Pearl Harbor, and wants to be buried there upon his death. (S17 Ep20/20)