* AcceptableTargets:
** Any case where there's a WouldHurtAChild villain gets taken personally by [[FriendToAllChildren Gibbs]] and the rest of the team.
** Rapists are not shown in any sympathetic light, and if you're a child molester or a sex trafficker, Team Gibbs will show you ''NO'' mercy when they hunt you down.
--> '''Abby''': ''(After Agent Cabot slaps a serial rapist in Interrogation for attempting to use VictimBlaming to save his skin despite the huge pile of evidence against him)'' Okay... I'm really antiviolence, but ''that'' was awesome!
** {{Subverted|Trope}} with the Real-Life Superheroes Neighborhood Watch program in "Secrets". Many of them are portrayed as pretty nerdy as they dress up in homemade costumes and take on "secret identities" However, the episode demonstrates that they willingly put themselves in danger constantly in order protect others, their influence has actually lowered crime rates by 50% in the DC area, and they can be pretty badass when the situation calls for it. Even Gibbs comes to respect the group by the end of the episode.
* AngstWhatAngst: Ziva. Though we do get shown some moments, most of the time she's surprisingly chipper considering everything that's happened to her.
* BadassDecay: Every time Kort shows up after season 4, something worse happens to him. It's no surprise that [[spoiler: he ends up getting killed]] no matter what the circumstances.
* BaseBreaker: One don't hear much about it but there's one camp that think that Ziva and Tony's relationship is LikeBrotherAndSister (making Gibbs' team like siblings with him as [[TeamDad Daddy]] [[PapaWolf Gibbs]]) and then there's the ones that think of it as BelligerentSexualTension. And then there's [[http://saisoto.deviantart.com/art/NCIS-BedTime-336416553 they]] who can't make up their minds. Even the series switched back and forth a lot.
* CompleteMonster: See [[Monster/{{JAG}} here]].
* CounterpartComparison: Shown in the S2 [=Ep12=] episode "Doppelgänger", with the team working with civilian law enforcement, which are all extremely similar to the characters.
* CriticalResearchFailure: In "Anonymous was a Woman", Lieutenant Gorman mentions the presence of UN peacekeeping forces in Afghanistan, which is not true entirely since [=ISAF=] is the only international force that provides peacekeeping to help Afghan police/soldiers in securing the country.
** After conjecturing that a computer has a twelve-core processor by glancing at its ''monitor'', a character is described as having the "the high score in virtually every massively multiplayer online role-playing game", a feat that would be not be possible to achieve in a human lifetime if most [=MMORPGs=] even '''had''' high score tables.
** The entire ''plot'' of "Semper Fortis" proceeds from a CriticalResearchFailure. A former Navy Hospital Corpsman is arrested (and ''charged'') for practicing medicine without a license. The team laments how NoGoodDeedGoesUnpunished and how wrong it is. The thing is, it '''''is''''' wrong. Besides being a long-standing principle of common law, most states have some form of [[https://en.wikipedia.org/wiki/Good_Samaritan_law "Good Samaritan Law"]] that offers protection to people who render aid in emergencies. Virginia (where the episode takes place) has Code [[https://lis.virginia.gov/cgi-bin/legp604.exe?000+cod+8.01-225 § 8.01-225]] specifically protects "Any person who in good faith, renders emergency care or assistance, without compensation, to any ill or injured person at the scene of an accident, fire, or any life-threatening emergency". Not only would the Corpsman ''not'' be charged, she would be even ''more'' protected. Her record would ensure that the idiot that arrested her would be tossed out on his ear.
* EarWorm: It seems like such a simple little ThemeTune, but just ''try'' getting it out of your head.
* EnsembleDarkhorse:
** People who dislike and/or outright hate every other character on the show will ''still'' love Ducky. But hey, it ''is'' [[Series/TheManFromUNCLE Ilya Kuryakin]]...
** CGIS Agent Abigail Borin, played by Diane Neal, has a popularity with the fanbase all out of proportion to the number of times she has actually been on the show, to the point where she made two consecutive appearances on ''Series/NCISNewOrleans'' and eventually made a third. Many are clamoring for her to be a full time addition to the NCIS universe and some blatant hints have been made on ''NCIS'' and ''NCIS: New Orleans'' that the powers that be may be seriously considering the idea.
* EvilIsSexy: Agent "Pouty Lips" [[spoiler:Lee.]]
* FandomHeresy: Regarding an ill-conceived reference to ''Series/DoctorWho''. We have [=McGee=], a fan of the show, [[IAmNotShazam calling the Doctor]] [[FandomBerserkButton "Doctor Who"]] [[TakeThat and movie cultist Tony condescendingly asking who watches that show.]] [[InternetBackdraft Yeah, the Whovians didn't like that.]]
* FoeYay:
** Between Kate and Ari in the first two seasons, even acknowledged by the other characters.
** Arguably, Tony and Trent Kort, the CIA agent who tried to kill him once.
** Gibbs and M. Allison Hart.
** With bonus [[HoYay Les Yay]] in "The Curse". A female suspect (Melora Hardin) smiles at Kate and says "Come on home with me, honey." [[http://mormonlesbian.blogspot.com/2010/10/sasha-alexander-and-curse.html Kate does]].
** Vance and that North Korean spy. Ducky explicitly explained how to her Vance is the closest thing to a lover she's had.
* FollowTheLeader: Abby is one of many quirky technogeeks inspired by the ''Franchise/The X-Files'' Lone Gunmen trio. One episode even features sailors named after TLG's creators, Glen Morgan and James Wong, as a ShoutOut.
* FunnyAneurysmMoment: Early jokes about "why Gibbs has three ex-wives" seem a lot less funny when [[ReplacementGoldfish the real reason]] becomes clear.
** A {{Crossover}} fanfic with ''Series/LawAndOrderUK'' that had Matt and Ronnie of the latter show venturing to DC became this thanks to (1) Creator/JamieBamber playing a recurring role as Bishop's husband, and (2) a storyline that had the NCIS team working with UsefulNotes/BritishCoppers.
** In "Page Not Found", Tony and [=McGee=] remark that a corrupt CIA agent is "worse than [[SmugSnake Trent Kort]]". Come "Dead Letter", [[spoiler: Kort is revealed to have been traitor for years.]]
* GottaShipEmAll: Gibbs, Tony, Ziva, [=McGee=], Kate, Abby, and, to a lesser extent, Jenny, are each shipped with all the others by fans. The Ziva/Kate ship is particularly jarring, considering [[spoiler:Ziva didn't even come on the show until after Kate had died.]] This leaves only Ducky, Palmer, and Vance who aren't commonly shipped with anyone (though you do occasionally see Ducky/Gibbs or Palmer/someone), perhaps because Ducky is about thirty-five years older than almost everyone else, Palmer doesn't have a substantial amount of interaction with anyone other than Ducky, and Vance [[spoiler:was married until very recently.]]
* HilariousInHindsight:
** The final line of "Twisted Sister," in which [=McGee=]'s sister thinks she may have killed someone, has Gibbs saying "Sometimes, [=McGee=], a little lie is good for the soul." Sis is played by Creator/TroianBellisario, who four years after the episode first aired would start to build [[Series/PrettyLittleLiars evidence to the contrary.]] [[spoiler: P.S. She didn't do it.]]
** In "Good Cop, Bad Cop", Tony is being annoying (as usual) to [=McGee=], including a reference to "The Tell-Tale Heart" by Edgar Allen Poe and asking him if he has a body buried under his floorboards. (ItMakesSenseInContext...sorta.) Seven years later, it's revealed that Tony's apartment has a body buried under the floorboards, and he doesn't even know it. And to make it better, this revelation comes after [=McGee=] leases the apartment for himself and Delilah, making Tony's joke prescient by seven years.
*** And speaking of that body, witness this dialogue from "Return to Sender" when [=McGee=] and Bishop try to guess how Tony could even afford his apartment. Does Gibbs intentionally hide the answer in plain sight?
----> '''Bishop:''' Loan from your dad?\\
'''[=McGee=]:''' Generous cougar?\\
'''Gibbs:''' ''(entering)'' Dead body...at the mortuary.
* HarsherInHindsight:
** Any scene with Jake and Ellie, courtesy of the revelation of [[spoiler: his affair and their subsequent divorce]].
*** In "Incognito", [=McGee=] congratulates Jake on him and Ellie going to St. Johns for a long weekend. He didn't know that it was supposed to be a surprise anniversary gift and Ellie sarcastically thanks [=McGee=] for ruining the surprise. Six episodes later, Ellie gets a nasty surprise of her own when [[spoiler: Jake's affair comes to light, meaning that was one of the last things that they were ever going to do together]].
** In one episode, a mob boss says that if Gibbs is screwing him around, he'll kill his entire family, and then him. Gibbs jauntily replies that everyone in his family is dead, though he would be willing to give the boss the names of his ex-wives. Later on, we learn that he does have a living father, Jackson Gibbs, who appears in several episodes...and eventually dies of a stroke.
** Tony's comments to Jimmy and Breena in We Build, We Fight become this after Family First, [[spoiler:when it is revealed that Ziva had their child without telling him. Victoria Palmer was not the first NCIS baby.]]
** In "Dead Letter," Kort mentions that he was the best man at a dead agent's wedding. Tony doesn't believe him. Either Kort's lying to gain sympathy and seem less guilty, or he just killed his friend (of which he does have very few).
** In "Hiatus, Part 2", an amnesia-stricken Gibbs is being caught up on history:
--> '''Doctor''': "It doesn't surprise you that [[Film/TheTerminator The]] [[Creator/ArnoldSchwarzenegger Terminator]] is the governor of California?"
--> '''Gibbs''': "Not at all. [[UsefulNotes/RonaldReagan The Gipper]] was President."
** A little over ten years from that episode's airing, we got an even '''''more''''' shocking presidential election result. Even odder, the episode was rerun on the USA network a few days after Election Day 2016.
** "Dead Man Talking" The team's attitude regarding the woman who turns out to be a pre-op transsexual, as well as the killer they're looking for comes off pretty transphobic nowadays--continually referring to her as a "guy", or with male pronouns, even as a "he-she" (which some consider a slur these days). In particular, Gibbs' snark about "adding that misdemeanor to the murder charge", regarding the woman having used the female restroom, is especially cringeworthy given the ongoing bathroom controversies.
** A marine recruiter in "One Shot, One Kill" tells two teenagers that Iraq will probably be over by the time they finish basic training. Yeah...
** Any episode that explores Abby's troubled background and issues stemming from harassment. In real life, Pauley Perrette shares this aspect of her character because she was aggressively stalked to the point of being sickened to even open a laptop and having tearful breakdowns, and now started her own group to protest and cope with this sort of abuse, as seen in a two-part special on ''48 Hours.''
** In "Dead Air", a RenegadeSplinterFaction of "Military At Home" (a social group based in Alexandria, Virgina, who believe that America should focus on their own problems instead of being the world's police) targets a high-school softball game which has the daughters of high-profile government officials as players ([[spoiler:Thankfully, the team managed to clear everybody out of the baseball field before the bomb went off]]). Seven years after the episode first aired, [[https://en.wikipedia.org/wiki/2017_Congressional_baseball_shooting a Left-Wing activist shot up the practice game of the Congressional Baseball Game for Charity]], which was held in Alexandria.
* HesJustHiding: [[spoiler: Ziva. This is even supported by producer and co-writer of the episode, Gary Glasberg, who stated it's left open to interpretation whether or not Ziva is dead for real. Though, now that Glasberg himself is no longer with us, if she does suddenly come back, [[{{Tearjerker}} he won't be there to see it happen...]]]]
* HoYay:
** In earlier seasons Gibbs and Tony have their moments.
** [=McGee=] and Tony get in many awkward situations.
** Tony and crook-of-the-week Jeffrey White in the episode "Chained." (Technically doesn't qualify as FoeYay, since Jeffrey didn't know they were enemies until the last five minutes.)
** In Season 12, [=McGee=] and [=DiNozzo=]'s reaction to Jake and Gibbs' friendship can only be described as jealousy--the latter relentlessly pumps Ellie for information and all but flips out when she mentions their biweekly racketball game.
* LikeYouWouldReallyDoIt:
** In one episode, Gibbs is "shot" as part of a sting. In the season 5 finale, [[spoiler:killing Jenny Shepard offscreen.]] Subverted, as they darn well ''would''. [[spoiler:She takes four baddies with her, though.]] And the serial killer's plan to get himself shot and ruin Gibbs' life...[[spoiler:it fails. Badly.]] "Requiem" opens with Gibbs having apparently drowned.
** Like you would really [[spoiler:blow up Tony and his old flame with an RPG. [[YourPrincessIsInAnotherCastle Your Target Is In Another Safe House]].]]
** Like you would really [[spoiler:blow up Gibbs, Abby, Tony, Ziva AND [=McGee=], and give Ducky a heart attack at the news. Yep, that's the season nine cliffhanger [[note]]all the actors have had their contracts renewed[[/note]]...]]
** Like you would really [[spoiler:kill Tony and Ziva off in a car crash 3 episodes before the end of season 10.]]
* MagnificentBastard: Ari starts off as one of these ([[spoiler:shooting Gerald and managing to escape]]), then does a HeelFaceTurn [[spoiler:when he saves Presidents Bush and Sharon]], then crosses the MoralEventHorizon in his final appearance [[spoiler:when he murders Kate and tries to kill Abby]].
* MemeticMutation:
** The famous DopeSlap. Apparently, the show had to tone down the use of it, as fans of the show were frequently doing it to Michael Weatherly in public.
** "Get your hands off my man, you [[ThisIsForEmphasisBitch bitch]]!" from Season 10's "Canary"[[note]] The team is undercover as ordinary citizens to catch a hacker, and Ziva is pretending to be a call girl talking on her phone[[/note]].
* MoralEventHorizon:
** Ari [[spoiler:shoots Kate and tries to shoot Abby]] to deliberately cause Gibbs grief, despite the fact that he could have easily shot Gibbs instead at the time and Gibbs was a more tactically valuable target.
** Ari believes that the missile strike that killed his mother was ordered by Eli David, in order to "harden" him into a better killer. Keep in mind that Ari was a child at the time, and Eli was [[AbusiveParents his father]]. If that wasn't enough, he [[spoiler:orders his daughter Ziva to kill Ari, her half-brother, after Ari proves to be disloyal]].
* MorePopularSpinoff: ''NCIS'' has far outstripped its parent show ''Series/{{JAG}}'', to the point that many viewers haven't even heard of the latter.
* {{Narm}}:
** The climax of the ChristmasEpisode ''Newborn King''. A pregnant Marine is giving birth while Ziva holds off the mercenaries who are trying to kidnap the baby...but all dialogue and sound effects are muted, with the soundtrack playing "Silent Night." Painfully overdone.
*** Given that "Silent Night" was probably an intentionally {{iron|y}}ic use of SoundtrackDissonance, it could qualify as NarmCharm.
** Abby's "crucify him!" speech.
** The infamous [[HollywoodHacking "2 idiots, 1 keyboard"]] scene.
** The [[CriticalResearchFailure depiction of Marseilles]] in "The Admiral's Daughter", especially the restaurant signs that make no sense and the ''accordion background music'', more fitting the 1910s than the 2010s.
* NarrowedItDownToTheGuyIRecognize:
** In the episode "Dead Reckoning," an international crime lord is played by some guy you've probably never heard of before. Meanwhile, the timid accountant who turns informer against him is played by Emmy Award winner Christian Clemenson. [[spoiler:If you guessed just by reading that sentence that Clemenson is, in fact, TheManBehindTheMan, you win a cookie.]]
** The episode "A Weak Link" had guests [[Series/{{Firefly}} Adam Baldwin]], [[Series/{{Angel}} Julie Benz]] and [[Series/MelrosePlace Doug Savant]]. [[spoiler: Subverted - None of them did it, it was a suicide]].
** Creator/{{Misha|Collins}} [[Series/{{Supernatural}} Collins]] guest-starred as someone who gets "Singled Out" as a kidnapping/murder suspect. [[spoiler: He did steal the car, but did not kill the navy lieutenant]].
* PeripheryDemographic: This series is far more popular among tween girls than the typical PoliceProcedural, thanks to the popularity of [[PerkyGoth Abby Sciuto]].
* TheProblemWithLicensedGames: The video game wasn't very well received. For starters only one voice actor from the actual show was in it, it was near impossible to lose, simple plots, poor visuals, etc.
* ReplacementScrappy: Averted with Ziva, as she is far more popular and liked than Kate. Viewers who often get introduced into the show from the third season on often don't know who Kate is until they either stumble across an episode where she's mentioned or view one of the first two seasons later on.
** Definitely not averted with Bishop, who is still on the receiving end of a lot of vocal fan hate after her second season.
* RescuedFromTheScrappyHeap: Director Vance wasn't well liked until [[spoiler:it was revealed there's more to him than meets the eye, and he very likely isn't Vance at all.]]
** After she was poorly received for being overly quirky in Season 11, Season 12 cast Eleanor Bishop as a probie taken under [=DiNozzo=]'s wing and attitudes towards her improved as well.
* {{Squick}}:
** In one episode, [[spoiler:a woman and her son with a vendetta against Ducky kidnap him, strap him to an autopsy table, and try to kill him by bleeding him out through a huge needle in his neck.]]
** Don't forget [[spoiler: when Gibbs find the husband-wife toe-eating team.]]
** The ColdOpening of "Murder 2.0". [[ShowerScene A woman turns on her shower]], [[SorryILeftTheBGMOn her husband puts on mood music]], [[DressHitsFloor Bra Hits Floor]], [[spoiler: [[NightmareFuel blood starts spurting from the shower head.]]]]
** "Angel of Death". A drug dealer and his addict girlfriend try to retrieve the body of a mule, who had the package burst inside him. While the stand-off happens, the addict [[spoiler:gets on the table and begins snorting straight out of the opened corpse]]. Bonus Squick for the corpse in question being '''her brother!'''
** The exploding bodies in the crypts in "Skeletons."
** In "Detour", Ducky and Jimmy weaponize this trope. When they are kidnapped and forced to perform an autopsy on a dead mole, they purposely sqiuck out their captors with the details so that they vacate the cabin they are chained in. This gives them enough alone time to plan out their escape.
** Some of the dead bodies, before and/or during the autopsy scenes, obviously count. Those makeup artists have no shortage of fake blood and guts.
* SpecialEffectsFailure: The show started using some extremely cheap looking [=CGI=] in lieu of practical effects in later seasons. [[https://www.youtube.com/watch?v=Wtfo43yV8rA Watch the car's transformation in this scene.]]
* StoicWoobie: Gibbs, Ziva.
* StrangledByTheRedString: Bishop and Qasim. Unlike the time and care taken to develop nearly every other love interest/love story, their relationship is depicted in a grand total of THREE episodes--one to establish that they're dating, one to kill him off a few weeks later, and one a few weeks after that to tell us their story via flashbacks. The sole purpose of the storyline seems to be to give Bishop the same tragic, screwed-up love life that nearly every other character has. As such, unlike the deaths of other love interests--Jackie, Diane, etc--his fails to have any emotional impact. Not to mention that the time frame of their relationship makes it implausible that they could have been together long enough to be considering marriage.
* StrawmanHasAPoint: Or rather, Abby's [[StalkerWithACrush psychotic stalker]] ex has a point, in that if he hadn't been stalking her and taking pictures of her, then he wouldn't have found the ''other'' stalker that had just kidnapped Abby on her way to court. Of course since it's [[DamselOutOfDistress Abby]] she's got the situation well in hand, but he still helped find the real bad guy who Team Gibbs didn't even know existed.
* UnintentionallyUnsympathetic: Eli David. Every so often the writers make him look like he is misunderstood, that he is some sort of a ultra-dedicated patriot, and therefore Ziva should try to make amends with him. All these ring hollow, however, because Ziva herself has once explicitly stated that, after abandoning her to death in Somalia, for all intents and purposes, Eli is dead to her.
* TheUntwist: Bishop thinks her husband might be cheating on her until she realizes that the woman she saw him with was from NSA's Internal Affairs department and thus concludes that he's in trouble at work. When she tries talking about him with it, he reveals that he ''is'' actually cheating on her with the woman from Internal Affairs.
* ValuesDissonance: As cited in the "harsher" post, the team's attitude in "Dead Man Talking" (an episode released in 2004) regarding the woman who turns out to be a pre-op transsexual, as well as the killer they're looking for comes off pretty transphobic nowadays--continually referring to her as a "guy", or with male pronouns, even as a "he-she" (which some consider a slur these days). In particular, Gibbs' snark about "adding that misdemeanor to the murder charge", regarding the woman having used the female restroom, is especially cringeworthy given the ongoing bathroom controversies. And Kate seems far more aghast at "Tony being on a date with a guy!", rather than Tony being on a date with, you know, a '''''murderer''''' who killed one of their fellow agents and was likely going to kill Tony as well. Not to mention that the murderer likely didn't transition because of identifying as a woman, but as of the ultimate disguise to get away with their crimes. Lending to the unfortunate implication that transgender people are somehow "bad" or "evil".
* TheWoobie: Various characters have been this at times. Tony sometimes skirts into JerkassWoobie territory.

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