[[quoteright:320:http://static.tvtropes.org/pmwiki/pub/images/21Jump_8930.jpg]]
[[caption-width-right:320:''"..You'll find you'll need us, 'cause there's no one else to call..."'']]

The 1980s version of ''Series/TheModSquad'', with a somewhat more believable premise. The series lasted from April, 1987 to April, 1991, with a total of 106 episodes in five seasons.

''21 Jump Street'' was the Creator/{{Fox}} Network's first drama, and aired on its premiere night along with sitcoms ''Series/MarriedWithChildren'', ''Series/TheTraceyUllmanShow'', ''Duet'' and ''Mr President''.

It is about a special undercover police unit in an [[CityWithNoName unnamed American city]], where young-looking police officers infiltrate schools to investigate youth-related crimes. In the earlier seasons these were high schools, later they increasingly went into universities and other non-high school settings.

The series made Creator/JohnnyDepp a star, but a TeenIdol was the last thing he wanted to be. He quit at the end of season 4, the series carried on for one other season (the 5th) after this, and then got cancelled.

A very well received [[Film/TwentyOneJumpStreet film "sequel"]] (a raunchy comedy spin-off) was released in 2012, starring Creator/JonahHill (who also co-wrote the script), Creator/ChanningTatum, [[Series/UnitedStatesOfTara Brie Larson]], and Music/IceCube. Creator/JohnnyDepp and Peter [=DeLuise=] appear in cameos as their original-series characters, Tom Hanson and Doug Penhall. Holly Robinson Peete also returned as Judy Hoffs, in a slightly more substantial role. The film itself received a sequel, Film/TwentyTwoJumpStreet, in 2014, which featured small cameos from Dustin Nguyen and Richard Grieco.

Due to the drastic difference in tone and contradiction of the show's continuity[[note]][[spoiler:Tom Hanson and Doug Penhall die in the movie]] (reportedly Johnny Depp himself demanded his character to die in the movie as a condition for accepting his cameo role) being middle-aged, working for the DEA in 2012, while in the ''Back from the Future'' episode of the series, they are shown [[spoiler:to have lived to be very old men in the 2030's after quitting police work]][[/note]], the movie is not necessarily recommended for fans of the series.

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!!This series provides examples of:

[[foldercontrol]]

[[folder:#C]]
* EightiesHair: Penhall's and Ioki's mullets. Hanson's longer haircut he had in Season 3.
* AdultsDressedAsChildren: More adults dressed as teenagers; the whole premise of the show is young looking police officers going undercover in high schools.
* AgentScully:
** Hanson is totally skeptical of Penhall's claims that he encountered aliens (and this story is soon revealed to have a different explanation); and he's the one who doesn't believe the "medium" the team hires in "Old Haunts in the New Age" really channels the spirits of the dead, and quickly exposes him as a fraud.
** Also Captain Fuller, when the team starts to use ouija boards and hire spirit-channeling mediums, is very disbelieving of this, and basically calls the rest of the team idiots for hiring/believing the medium.
* AirVentPassageway: Several schools are broken into this way during the show. In one episode, Harry tries to sneak in through the vents while a school is under siege. He gets inside, but the vent and ceiling give way beneath him at the worst possible time, dropping him in front of a bunch of guys with guns.
* AmbiguousEnding: Due to the show's attempts to confront such difficult issues as drug use and criminal behavior in high schools somewhat realistically, episodes often end this way, sometimes qualifying for a DownerEnding if a student they're trying to protect dies or goes to jail, but leaving the viewer with the question of what to do about the tragic circumstances that led to it.
** "Honor Bound": Does one of the murderers of the gay man, urged by Hanson and Penhall to confess, in the end confess, so that justice is served?
** "Last Chance High": Was Frances really physically abused by her parents, or was she making all of that up being at best delusional, at worst a pathological liar?
* AssholeVictim: The ShockJock whose car gets blown up in "Next Victim". Due to his hateful and racist ranting, the team is none too happy about having to look for the person who did it.
* BabysittingEpisode: Doug has a crush on his neighbour, who is a single mum; he hopes to go out on a date with her, but instead she asks him to babysit her baby, which he isn't enthusiastic about, but he does it.
* BadButt: Every instance of the word "ass" was dubbed over with the word "tail" in the first Season, leading to "I'll kick your tail!" and such. The mouths of the actors clearly are saying "ass" though.
* BaitAndSwitchCredits: Peter [=DeLuise=] mentions in his commentary track for one of the episodes of the first season: the credits feature a bunch of gunplay and a car flipping over; however, the series mostly is about undercover work and centers around sedate dialog-driven scenes. The car flipping over was one of the most expensive scenes shot for the series, and was really the only one of its kind.
* BecomingTheMask: In Joey Penhall's first episode, he's sent undercover into a cult, despite his lack of previous undercover experience, because he has the same kind of history and psychological profile as the kids who are being recruited. But it doesn't take much, or take very long, for Joey to become a genuine convert, [[ForegoneConclusion precisely because he does have the same psychological profile]] as the kids considered ripe for recruitment. This is actually Lampshaded by both Joey and Doug during the later scenes when Doug is talking to Joey to deprogram him from the cult's mindset.
* BitterSweetEnding: In most episodes, the biggest immediate problem / case was solved while they still had a very [=TearJerker-y=] ending. Just some examples:
** "Blindsided": A father who sexually abuses his daughters, [[spoiler:at the end is arrested and persecuted for that. Justice is served here, and it's good that his daughters now don't have to endure sexual abuse anymore; but since their mother had died earlier, they now don't have any parent left, and the oldest daughter is still under age, which means they will probably be moved around orphanages or foster homes from now on, and lose their house]].
** "Draw The Line": Hanson luckily is [[spoiler:exonerated (he had been wrongfully convicted for murder) with help from Booker; and Ioki survives and wakes up from his coma]]. But Booker is [[spoiler:Reassigned To Antarctica]] as punishment for his having broken the rules to [[spoiler:exonerate Hanson, something which makes Booker quit his job and abruptly leave the series on the spot; and Ioki gets anxiety issues and develops an addiction to Morphine as a result of his shooting]].
** "Eternal Flame": The person who turns out to be the bad guy, fraud and criminal, [[spoiler:is arrested for it; and his wife, whom he deceived and lied to, dumps him, which he most people would argue, deserves]]. It ends with a Tearjerker for [[spoiler:Hanson though, as he almost gets the girl (whom he speaks of as the love of his life), but she, at the end, abruptly says to him she wants to start a new life elsewhere, and leaves]].
* BowlingForRatings: Hanson is an avid bowler, and a few episodes feature shots of him in bowling alleys.
-->'''Hanson:''' I can't Friday, that's my bowling night.
-->'''Penhall:''' Your ''bowling'' night?
-->'''Hanson:''' Yes. I'm in a league.
-->'''Penhall:''' In. A. ''League''?
* TheBusCameBack: After Booker quits the force and is spun off into his own series, he returns midway through Season 4 for a two-part crossover between the two series.
* ChainedToARailway: Hanson is handcuffed to a roller coaster track, with the car coming towards him. [[spoiler:Only at the last second is he unchained, so that he doesn't lose an arm.]] The [[spoiler:ManicPixieDreamGirl he meets in this episode]] did this, because according to her "without feeling the rush of impending death, you're not really alive".
* ChristmasEpisode: Set against the backdrop of Christmas, "Christmas in Saigon" is about the police finding out that Ioki has been lying about his identity. It has flashbacks taking place in '70s Vietnam, but in present time it is Chrismas, and at the end, all characters have a Christmas dinner together.
* ChuckCunninghamSyndrome: Hanson and Ioki's departures between Seasons 4 and 5 are never explained.
* CitizenshipMarriage:
** In "Come From the Shadows", Penhall falls head over heels for an immigrant woman from El Salvador, and goes so far as to marry her mere days after meeting her, to prevent her from being deported. Knowing that StatusQuoIsGod makes the inevitable DownerEnding a ForegoneConclusion.
** Also Nadia's (a Polish girl on a high school exchange in the U.S.) motivation for going after every man she met in "America, Oh What a Town". She was hoping she could find a way to stay in America.
* {{Cliffhanger}}:
** The ending of Season 3. Hanson is [[spoiler:wrongly convicted and sent to prison for a murder he didn't commit]] and Ioki is [[spoiler:in coma and on the brink of death after being shot]]. Also, Booker and Penhall have fallen out with each other over [[spoiler:the former's arresting Hanson, and the latter's lying during testimony in court]].
** The ending of Season 2--the team are told that Jump Street will be dismantled, and they all find other jobs during the season finale. [[spoiler:Come Season 3, Jump Street is restarted]].
* ClearTheirName: When Hanson is arrested and put on trial for killing another cop (he was innocent of that, though he did break into the cop's house, which made him look guilty) Penhall is about the only one standing up for him; he even goes looking in the cop's house for the bullet that could prove Hanson innocent.
* ClipShow: "Back From the Future" uses a young cop 50 years in the future, interviewing the now elderly members of Jump Street about their glory days, as a framing device for showing scenes from earlier in the series again.
* ClumsyCopyrightCensorship: The American [=DVDs=] suffer from this--while the licensed music wasn't the WHOLE draw of the show, it was an important part of the atmosphere, and lyrics were often used to communicate plot, which makes chunks of some DVD episodes make very little sense now that they're backed by nothing but elevator music. The [=DVDs=] still sold enough to finish the show, possibly because there weren't many bootlegs in circulation. Uploads of the show now are almost always from this butchered version, even though the full versions do exist (see the Trivia page).
* CompulsorySchoolAge: The cops are still adult age, but they look like high schoolers, so they have to go to high school to fight crime that happens in / around high school.
* ConverseWithTheUnconscious: While [[spoiler:Harry is shot and left]] in a coma, the other officers visit to make peppy little get-well speeches and talk about what's been going on in the department. Hoffs is mortified when she slips and admits that she thinks of him as dead. [[spoiler: He got better.]]
* CorruptCop:
** Penhall comes across a group of these near the end of Season 4, when he's temporarily assigned back to uniform; the only innocent member of the group, besides Doug himself, is the rookie. [[spoiler: When Penhall turns them in, he recruits said rookie into Jump Street. Dean Garrett was the show's first attempt at a SuspiciouslySimilarSubstitute for Hanson; he sticks around several episodes at the murky end of Season 4 / beginning of Season 5 before disappearing, only to be BackForTheDead halfway through Season 5.]]
** Part of Tony "Mac" [=McCann=]'s backstory; he '''wasn't''' one, but knew a group of cops who were. He'd decided to keep his head down and stay out of the mess, but instead he was shot by one of the group, who thought he was going to inform on them. Afterwards, he was metaphorically run out of town and into Jump Street.
** Suverted for Booker. In the 1st episode he appears in, he physically bullies high school students as well as fellow undercover cops, and he acts racist, leading Hanson (and at first, the audience) to believe Booker is a Corrupt Cop. Turns out that Booker is an Internal Affairs officer though, so he was playing that role to provoke the Jump Street team. [[spoiler: He ends up joining the Jump Street team by the end of the episode, and isn't hinted as being a corrupt cop again during the rest of his appearances]]].
** "Loc'd Out" / "Draw the Line": A cop is into illegal weapon trade. Even worse, he [[spoiler:murders his own partner, and then deliberately lies in court to frame Hanson, another cop, for the murder so Hanson goes to prison]].
* CoolCar :
** Hanson drives a Sixties-era Ford Mustang.
** Hoffs drives a hip car--as remarked by the other characters In Universe in the Pilot. Hanson even keeps repeating "Really?" when she says it's hers, upon which she says in a fake-snotty manner "You know, they were all out of pink Cadillac's".
** Penhall drives a jeep-like vehicle, that another character ''really'' likes and keeps insisting on buying (Penhall: "It's not for sale.")
* CopKiller:
** "Gotta Finish the Riff": Averts this, as Jenko is killed, but not on the job as a cop; he's hit over by a drunk driver.
** Recurring character Dean Garrett is briefly shown in the teaser for "In the Name of Love"; between the murky lighting in the scene and it being half a season since his brief run on show, you don't recognize him, and think he's just a random mook getting killed off by the ep's BigBad. Which makes it an even more effective shock when he's identified by name after the opening credits, when Captain Fuller reminds us that he worked [[ItsPersonal briefly at Jump Street]], which is why they're willing to work [[TeethClenchedTeamwork with the FBI]] to arrest the BigBad.
* CourtroomEpisode: "Loc'd Out: Part 2" (the Season 3 finale) is about Hanson being on trial for murdering another cop, even though he's innocent.
* CurseCutShort: In an OOCIsSeriousBusiness moment, the normally very composed Captain Fuller is about to say some choice words to an FBI officer who really irritates him, but doesn't get to it:
--->'''Fuller:''' Why don't you ''take'' that walkie-talkie and ''sh''--''[Is cut off]''

[[/folder]]

[[folder:DM]]
* DarkerAndEdgier: To the [[Film/TwentyOneJumpStreet 2012 same-called movie]], which itself is DenserAndWackier. The series often featured heavy subjects, and lacked the PlayedForLaughs style of the movie.
* ADayInTheLimelight:
** Ioki as a character gets much less attention than Hanson and Penhall, but gets the Season 2 episode "Christmas in Saigon" entirely, and the Season 3 episode "The Dragon and the Angel" mostly, devoted to him.
** Booker, who normally has the smallest role of the (then) five cops, is the protagonist in Season 3 "Nemesis".[[note]]Allegedly, that episode was written with Hanson as the protagonist but Johnny Depp refused to play it due to the racist and violent nature of the plot, and then the role was taken over by Booker.[[/note]]
** Captain Fuller, whose personal life we previously knew nothing about and who had a smaller role than the other cops, gets an episode dedicated to his estranged relationship with his son.
** Sal "Blowfish" Banducci is a minor character, who gets a larger role than usual in the episode where Booker tries to set him up for a date.
* DirtyHarriet: Judy joined the Jump Street program because it was the only way she'd be able to get any ''other'' type of assignment. Of course, this didn't mean that she didn't ''still'' get just such an assignment occasionally.
* DisguisedInDrag:
** Hanson had to disguise himself as a woman during a case where a boy was abducted and Hanson had to pose as the child's mother.
** Ioki put himself in drag when the team was trying to capture a man that was exposing himself to women.
* DoItYourselfThemeTune: The theme tune was performed by Holly Robinson who played Officer Judy Hoffs on the show (with the "JUMP!" shout provided by Johnny Depp and Peter [=DeLuise=]). Incidentally, this is one of the few Creator/StephenJCannell shows where the theme tune was ''not'' written by Mike Post (see also ''Hawkeye'' ([[Franchise/MarvelCinematicUniverse not that one]]), ''Cobra'', ''Street Justice'' and ''Missing Persons'').
* DoubleDate: Played For Awkward: Penhall is caught flirting with an attractive co-worker of his, Jackie, by his girlfriend Dorothy. He then wants to [[ShipperOnDeck set up]] Jackie with his best friend / partner Hanson, thus invites an (initially very resistant) Hanson out for a double (dinner) date at Penhall and Dorothy's house. The date goes extremely awkward, as Hanson and Jackie first bicker about differing music tastes and then turn out to be distant co-workers and go fight about a work case as well, resulting in [[ScrewThisImOutOfHere Hanson abruptly abandoning the entire thing]].
* DownerEnding:
** The end of Season 3 is a TearJerker and NightmareFuel for everyone on the team: Hanson [[spoiler:gets wrongly convicted and sent to prison for a murder he hasn't committed; Ioki is in a coma and on the brink of death; Booker and Penhall are at each other's throats and barely can work together anymore]], and the whole team is down and dis-spirited in general.
** Penhall and Hanson go through a lot of trouble (including being tortured by the corrupt military) travelling through war-ridden El Salvador to find Penhalls wife... [[spoiler:only to find out at the end that she has been murdered. Just a few days ago.]]
** The way Jenko was [[DroppedABridgeOnHim abruptly written out]] of the series. He died, but that wasn't even shown (only a very brief shot of his funeral is shown), and worst of all, he didn't even die on the job/doing something heroic... he got ran over by a drunk driver (as the other characters say: his death was completely pointless).
* DoYouWantToCopulate: Though she uses the more delicate-sounding "make love" then any other synonym for "have sex", Jackie gets quite to the point when she makes the following proposition to Hanson, who up until then she only has bickered with: (also see "One Of These Is Not Like The Others")
-->'''Jackie:''' Drive me to my apartment and I'll let you make love to me.
* DrPsychPatient: Hanson and Penhall have to go visit a psychiatrist after they have been involved in [[ShotInTheAss a shooting]]. When they arrive in the doctor's office, a young woman wearing a doctor's coat starts a session with them, seemingly very professional--until a man, the ''real'' psychiatrist, walks in, apologizes for being late, and sends the woman away to her hospital room (it's also clear from his reaction, that this patient of his regularly does this).
* DreadlockRasta: When Fuller sees his son for the first time after his divorce again, the first thing he notices about his son is that he now has dreadlocks. The son then turns out to have become a Rastafarian, and have some hippy-ish convictions in general now.
* DrunkDriver:
** "Gotta Finish the Riff": Jenko is killed by a drunk driver. Happens off-screen and is only mentioned afterwards, but Judy specifically mentions how senseless his death was.
** "Two for the Road": Fuller is caught behind the wheel with too much alcohol in him, after a few glasses of wine on a date. He initially tries to get away with this, but realizes that he was very irresponsible, and that as a cop he has to practice what he preaches.
* EarlyInstallmentWeirdness: In the earlier episodes of the first season, compared to later episodes: Jenko is the team's Captain as opposed to Fuller, who was a polar opposite in personality. The team had a very different dynamic due to Hanson being just new and everybody just getting to know each other. Hanson was an awkward and uptight rookie cop but later a confident cop and a much more loose character. Also, the earlier episodes featured more straightforward police cases, while the later ones tended more towards being a VerySpecialEpisode / Afterschool Special.
* EndOfSeriesAwareness: Hanson makes several references to wanting to quit the force in Season 4. It was well known by this point that Johnny Depp wanted to leave the show, which he actually did at the end of the season.
* ExpositoryHairstyleChange:
** During the few episodes in Season 3 when Penhall leaves the Jump Street team to join the Intelligence team, he suddenly grows a pretty big beard and his hair is slightly longer and more unkempt than usual. Even the other characters In Universe remark a few times "What's with the beard?". The hairstyle change seems to symbolize how he's doubting he even should be at Intelligence the entire time he is there. His experience there ends bitter, anyway, since he is shipped off from that team after having made a mistake on a case. Then he returns back to Jump Street clean-shaven, and his spirits rise again.
** Fuller's son, between the two episodes he appears in: first, he's a teenager who has become a Rastafarian and is acting like a hippie (this is played as "a teenager trying to find his identity") and has dreadlocks. In the other episode, three seasons later, he's an ambitious and almost preppy college student--and he's cut his hair short.
** Meta version for Johnny Depp: as the show went on, and he became more and more of a "[[MrFanservice teen hearthrob]]" (to his vocal dismay), his bangs get longer and longer, until they're half-covering his face; this was deliberate on Depp's part, to try and hide the face that got him so much unwanted attention.
* FanSequel: ''[[http://www.youtube.com/watch?v=_XspU4ZxHkw 21 Jump Street Rangers]]'', which takes place years after the original team's adventures. (The series also adapts ''Series/TomicaHeroRescueForce'' for added points.)
* {{Fingore}}: Played straight and for drama when a student buys a cheap gun from the black market, and it malfunctions and explodes in his hand; his entire hand is severely injured.
* GoodGirlsAvoidAbortion: Deconstructed in "Whose choice is it anyway?". The main guest star seriously looks into adoption, and sees a counsellor to explore her options, including abortion. [[spoiler: The character ends up miscarrying after her boyfriend bombs the counselling/abortion clinic, him not knowing she's in there.]] In the episode it's also revealed that Judy had an abortion at 17; when asked if she regretted it, Judy answers poignantly that she regrets getting pregnant, and she ''really'' regrets not sharing it with her mother, but she believes that she made the right choice. The episode itself shows either a serious exploration or an example of all the three main choices: keeping and raising the baby, adoption, and abortion--and all are shown as valid choices.
* GoshDangItToHeck : Happens frequently. "Good gaul-darn riddance!". Also, when the show originally aired on TV, every instance of the word "ass" was dubbed over with the word "tail"; the actor's mouths clearly were saying "ass" though.
* HalloweenEpisode: There were two: "The Worst Night of Your Life" in Season 1, and "Old Haunts in the New Age" in Season 4. In both, Halloween was important as background, and both had much in common plot-wise, as noted under RecycledScript under Trivia.
* HeterosexualLifepartners:
** Penhall and Ioki were this to each other for a while during Season 3. After Penhall was [[HenpeckedHusband thrown out of his house]] by his girlfriend Dorothy, he moves into Ioki's apartment (driving the latter almost instane with his bad manners). It even accumulates in a scene with Ioki dressed up in drag and them pretending to be a heterosexual couple on a date (in order to catch a criminal), in which they're bickering about their domestic differences.
** Penhall and Hanson were like this, too; so much so, that their most frequently-repeated undercover persona was as the [=MacQuaid=] brothers.
* HoldTheUnsolicitedIngredient: In the episode "Gotta Finish the Riff":
-->'''Reginald Brooks:''' ''[Ordering pizza for his hostages]'' I want 10 with sausage, 10 with pepperonis. And no anchovies. I see one anchovy and I kill the librarian.
* KarmaHoudiniWarranty: Taylor Rolator (Josh Brolin) in "My Future's So Bright I Gotta Wear Shades". He's a smug, coke-sniffing, thrill-seeking honor student from a prep school who essentially walks free by turning in the two buddies who joined him in raping and murdering a troubled high school girl. [[spoiler:At the end of the episode, he runs into the girl's brother, a tough guy mechanic who had threatened to enact street justice on his sister's killers. The mechanic shoots Rolator, leaving him with a fate much worse than the jail time his school friends and drug dealer are facing.]]
* LaserGuidedKarma: "Whose Choice is it anyway?": A teenage boy is infuriated that his girlfriend is considering abortion, and egged on by a local pro-life spokesman he firebombs the local planned parenthood-style clinic late at night. After he's arrested, he's full of self-righteous fulfilment, even after being informed that the clinic wasn't empty; [[spoiler: that's when Ioki tells him that his girlfriend was at the clinic for an after-hours counselling session (and she was at the clinic at that time ''because'' the boyfriend and the pro-lifers were harassing everyone in the vicinity during business hours). The girlfriend will be okay eventually, but she's miscarried the baby.]]
* LastNameBasis: The cops almost always call each other by their last names. Averted for Sal Banducci, who's always either called by his nickname "Blowfish" or his first name Sal.
* LetUsNeverSpeakOfThisAgain: Judy and Doug [[spoiler:almost have sex with each other]] and afterwards (mostly on insistence of Judy, who seems to feel very awkward about it) swear to each other to act as if that never happened, and to never speak of it again (least of all to other people, Judy insists; and it is telling that, as far as is shown on the show, Doug never tells even his best friend Tom).
* LiteralAssKicking: Hanson gets his butt hit hard with a wooden plank, as part of a hazing ritual when he's undercover in a fraternity, in "Hell Week".
* MalignedMixedMarriage: Penhall falls head over heels with, and marries, an El Salvadorian woman within four days of meeting her. She's an illegal immigrant and he is soon being accused of marrying her only to get her into the U.S.; a judge annuls their marriage and sends her back to El Salvador, upon which [[WhatHappenedToTheMouse we don't hear anything about her again]] for half a season. [[spoiler:It does not end well: Penhall and Hanson finally go looking for her in El Salvador but find out she's been murdered by the corrupt military.]]
* ManicPixieDreamgirl:
** An episode featuring a girl named Quincy, who sort of positions herself as this, dragging the straight-laced Hanson around and trying to convince him to "lighten up". Of course, her idea of fun is crime sprees and potentially-fatal thrill-seeking. She terrifies him, and ends up [[spoiler: shot to death by security guards while robbing a house.]]
** Hanson's ex-girlfriend Linda he runs into in Season 4; she is an aspiring painter / artist, married to a nightclub owner (as admitted by herself, mostly because this man has the financial means to get her her own gallery). The attraction between this wacky character and the straight-laced cop Hanson is, is hard to explain, but it's probably "for old time's sake" only. At the end of the episode, she does a ScrewThisImOutOfHere, leaving town and leaving ''both'' her husband and a heartbroken Hanson behind [[note]]She is never mentioned again in the series, but, whether tellingly or not, in contrast to Seasons 2 and 3 in which Hanson had a girlfriend in Amy and Jackie respectively, Hanson's character never finds romance again during the series[[/note]].
** Played with for Tony 'Mac' [=McCann=], Hanson's SuspiciouslySimilarSubstitute; in his case, it's more Manic Pixie ''Nightmare'' Girl, as she turns out to be the leader of a Satanic coven, which among other nasty things [[spoiler: practises human sacrifices of homeless people.]]
* MaybeMagicMaybeMundane: The 'psychic' girl in "Old Haunts in the New Age". She sees / draws things that she shouldn't have any way to know, but she's not infallible either. Psychic, or lucky guess?
* MistakenForAliens: "Old Haunts in the New Age": Doug is convinced he has encountered aliens, and that they moved his belly button. [[spoiler:Turns out the lights he saw was just an advertisement by normal humans, not aliens]].
* MoodWhiplash: Season 4 featured two episodes that took place out of state: the first (ep. 18) took place in Florida during Spring Break and featured partying college students and lots of girls in bikinis; then in ep. 19, the tone turned very grim and PlayedForDrama when Doug and Tom went to El Salvador, which had a civil war at the time, and found out [[spoiler:Doug's wife had been murdered]].
* MultiPartEpisode: The Season 3 finale consist of two episodes ("Loc'd Out", a.k.a. "Partners") that technically are one storyline.
* MyGodWhatHaveIDone
** "Fathers and Sons": Jackie, Hanson's D.A. girlfriend whom he confides in that the mayor's son is the biggest suspect in a big drug case, in reaction, out of worry that the case will ruin Hanson's career, tells the mayor, and the Jump Street team is told by higher-up to abandon the case. The teen son of the mayor then promptly dies of a cocaine overdose. Hanson, angry about Jackie violating his trust, points out to Jackie that had Jump Street not been removed from the case because of her meddling, the teen would have been arrested but not dead. She looks completely guilt-stricken about it and later begs Hanson for forgiveness.
** "Whose Choice Is It Anyway?": A boy whose pregnant teenage girlfriend wants to get an abortion while he wants to have the baby, bombs the abortion clinic--but the girlfriend is there at the time, leading to her miscarrying the baby and her getting severely wounded. Upon finding that out, he has this reaction. Also see Laser Guided Karma.
** "Honor Bound": Some members of a military high school do violent assaults on gay men; one of the attacked gay men dies. The murderers don't have any remorse initially, but it turns out the murdered man is the boyfriend of one of the assailants' brother. Upon hearing that he murdered his brother's lover, the assailant is shocked, cracks and for the first time seems to consider gay people as ''persons''.
[[/folder]]

[[folder:NS]]
* NerdGlasses: Invoked. Hanson wears glasses whenever his undercover identity is more nerdy, to accentuate that trait. In ''Gotta Finish the Riff'' where he "is" a geek and in ''Research and Destroy'' where he goes undercover as a chemistry student. Since Hanson never wears glasses otherwise, they must be "fake" (non-corrective) glasses.
* NeverLearnedToRead:
** The relevantly-titled "Afterschool Special": An illiterate boy in a disadvantaged-neighborhood high school.
** "Say It Ain't So, Pete": An illiterate university student that got into university on an athletic scholarship.
* NewTransferStudent: Happens in about every episode (at least during the earlier seasons, when the episodes more consistently take place at schools), due to the premise: the show is about young-looking cops going undercover in high schools. Every time they go undercover into a school, they pose as a high school student that just transferred. Discussed explicitly in a.o. Season 4's ''Out of Control'' when Tom Hanson is filling out a transfer student form, and in ''Research and Destroy'' when Tom says he transferred to the college from M.I.T.
* NonIndicativeTitle: Though many episodes were named ExactlyWhatItSaysOnTheTin, there also were some with puzzling names. ''Say It Ain't So, Pete'' is about gambling college students. There isn't any ''Pete'' character in the episode, and that phrase isn't uttered or referenced in any way in the episode.
* OfficeRomance:
** Downplayed with Hanson and Jackie. He's a cop and she's a D.A., so they don't literally share the same office, but they often work on the same cases, thus knowing each other from work. Indirectly, they meet because their work overlaps (Penhall works with her, and is the one who sets them up); they also bicker about their common work environment (ep. ''Blue Flue''), and work eventually is what breaks their relationship (Hanson confidentially tells her something about a police case, but she tells the mayor, whom she works with as a D.A., leading to the case being dismissed; Hanson can't forgive her for that).
** PlayedForDrama with Judy. She starts a romance with a sort-of co-worker (a municipal employee who has to review the Jump Street officers). Turns out he's married and deliberately concealed that fact to her; upon which she breaks up with him. Then he turns into a StalkerWithACrush, stalking her with telephone calls and, when she refuses to continue the romance with him, outright lying on his report about her / the Jump Street program. This case is also [[ConversedTrope conversed]] In Universe, as Judy's story, once Hanson finds out, gets Hanson and Jackie (themselves in an OfficeRomance, see above) talking about {{OfficeRomance}}s, their viability and dangers.
* OhCrap: The reaction when one of the Jump Street officers says "I'm a cop!", or when the young offenders discover the ruse for themselves. ("You're a cop!")
* OlderThanTheyLook: The show was entirely based around the premise of cops who looked young enough that they could go undercover as high school students.
** Which was pretty silly, and only sorta worked because of DawsonCasting. The actors standing next to ACTUAL high-schoolers would've looked hopelessly out of place.
*** Not silly considering many programs were based on cops passing as high school students.
** acknowledged somewhat in later seasons; see RealLifeWritesThePlot
* OneOfTheseIsNotLikeTheOthers: Jackie wants to make up to Hanson for having scoffed at him earlier; he rebuffs the first two offers, but the last one's... different, and so is his reaction to it.
-->'''Jackie:''' Why don't you drive us to a coffee shop, I'll buy you some waffles.
-->'''Hanson:''' ''[Defiant]''I don't want any waffles.
-->'''Jackie:''' Then drive us to a florist, I'll buy you some flowers.
-->'''Hanson:''' ''[Irritated]'' I don't want any flowers.
-->'''Jackie:''' Then drive me to my apartment, and I'll let you make love to me.
-->'''Hanson:''' I don't want... ''[Shuts up and immediately and hastily starts his car's engine and drives away]''
* OrphanedPunchline: The Season 3 premiere ends with a joke of the "Several racial stereotypes walk into a bar" variety being told by Booker to Hanson. We never hear the punchline, which fits the overall AmbiguousEnding concerning whether Booker is actually racist or was just playing the role for a case he and Hanson had worked on together.
* OutOfFocus: Most episodes tend to center around the one or two officers working a case, with the captain and the other characters only getting a few lines here and there, but Season 4's ''God Is a Bullet'' is notable for not featuring any scenes at the precinct, and Penhall and Hoffs being the only main characters who appear. Later in Season 4, an entire episode took place in El Salvador, and didn't feature any police work at all and no characters but Doug and Tom.
** This becomes more prevalent as the later seasons progress, with most of the characters other than the one or two in the spotlight getting a mere MandatoryLine, if they appear at all. Johnny Depp--ostensibly still the star of the show--is absent more frequently than any other actor at this point.
* OutOfGenreExperience: While early seasons almost exclusively revolved around the Jump Street cops posing undercover in high schools, later seasons saw more episodes where the main plot didn't focus on a student, or students.
** ''Shirts and Skins'': Penhall investigates the murder of a neo-Nazi leader with an adult son [[spoiler:who is eventually revealed as the killer]], while Hoffs and Ioki blend in with anti-racism vigilantes.
** Numerous later-season episodes which focus on the officers' personal lives, as opposed to campus or youth crimes.
** ''Stand by your Man'': Starts as a standard episode where the team investigates drug abuse. But that case itself is solved within 15 minutes and the episode turns out to be about Judy's rape, making her the victim here instead of the police officer. It's much more dramatic and less crime/action oriented than most of the series (see also "Break the Cutie" above).
** The biggest disgression happens with two episodes in Season 4, which respectively center around: first going to Florida on Spring Break, and then going to war-ridden El Salvador and discovering [[spoiler:Penhall's wife has been murdered by the corrupt military.]]
* ParentalSexualitySquick: Hanson's mother breaks up with her boyfriend, and Hanson asks why the relationship suddenly ended. She, after asking "Can I be frank with you?" tells Hanson that the sex was bad--to which Hanson has a "Squick, I don't want to know!" reaction. She reacts with "I didn't think you'd be so sqeamish!". [[https://www.youtube.com/watch?v=4Rf3ozRZ7UQ&feature=youtu.be&t=2654 It's actually pretty funny]].
* ThePlace: The title of the series itself, and of the team of cops: "21 Jump Street" is the address the team resides, and "Jump Street" is how they call their team.
* PoliceAreUseless:
** The opinion of the Street Rangers from Season 3.
** In general, even though the main characters ''are'' the police, uniformed officers still appear to be useless, since the story almost always makes some excuse to not bring them in and bust a suspect, because of course Jump Street needs to gather more evidence via their undercover officers first. This can be a bit silly in situations where most real-life officers would call for backup, but it's probably more a case of TheMainCharactersDoEverything.
** This is character's Tom Hanson's sentiment during much of Season 4. Following his having experienced what it's like being in a Juvenile Prison in Season 3; having been wrongfully sentenced for a murder he didn't commit; and watching someone he arrested get capital punishment, Tom gets extremely cynical about police work. During Season 4 he keeps mentioning wanting to quit being a cop, and at the end of Season 4, he seems to have finally done that, since [[ChuckCunninghamSyndrome he disappears]].
* PopularHistory: The show stands as a good example of what the 80's were actually like.
* PrisonEpisode
** ''Swallowed Alive'': Hanson goes undercover in a youth prison.
** ''Draw the Line'': Tom Hanson is in prison after being wrongfully convicted for murder. [[spoiler:He manages, with help from Booker, to prove his innocence and is released at the end]].
* TheQuincyPunk: "Mean Streets and Pastel Houses" is about a group of 80's punk teenagers.
* RapeAsDrama:
** Judy becomes a rape victim in Season 4's ''Stand by your man''; several episodes later mention Judy's later trauma over it, even near the end of the show.
** ''Hell Week'': a college student is raped at a fraternity party, in front of many onlooking other students. It traumatizes her so much that she quits college, and it also affects the life of her brother, who also is in that college.
* RashomonStyle: In ''How I Saved the Senator'', a [[ExactlyWhatItSaysOnTheTin Senator was saved]] from a bomb explosion targeted at him during a speech. A journalist interrogates all Jump Street members, and gets vastly different and contradictory stories from everyone. They are all shown as films in different styles: Hanson's is a silent, black-and-white movie [[note]]Which coincidentally already showcased Creator/JohnnyDepp's talent for physical comedy for which he was later praised for his role in ''Film/BennyAndJoon''[[/note]], Ioki's a martial arts movie, Penhall's a James Bond-style movie, etc. In the end, it turns out [[spoiler:none of the stories was true and a student did most to get everybody away from the bomb]].
* RealLifeWritesThePlot : In-series. The actors aged so much in Real Life, that after a few seasons they couldn't realistically pass for high school students anymore. Therefore, as of Season 3, episodes start to deviate from the, previously standard, High School setting as where the Jump Street crew goes undercover--and start to cover different, more adult, environments they go undercover in. E.g. ''Hell Week'' takes place at a college / university; ''Blinded by the Thousand Points of Light'' is about homeless young adults; ''A.W.O.L.'' is about a soldier on the run. This was played up even more in Season 4, which had even more episodes set at college / university instead of high school (''Say It Ain't So, Pete'', ''Stand By Your Man'', ''Research and Destroy''), and was when a Jump Street crew member, Penhall, first went undercover as a staff member instead of as a student (''Blackout'' / ''Business as Usual''). By Season 5, Penhall and Hoffs have visibly aged enough that they have not only been on 'regular' duties more than once, but in Season 5 they're both sent undercover as ''staff'' more than students. E.g. in ''Diplomas for Sale'', Doug, Judy and new guy Mac are college, not high school students. ''Poison'', Judy is a guidance counsellor, and Penhall is off-site support for the guest star undercover agent; in ''Just say no! high'', Judy is a student, but Doug is an assistant sports coach.
** one of the reasons (besides Johnny Depp leaving) that Mac [=McCann=] and Joey Penhall joined the cast season 5; they still looked young enough to pass as high school students, even if only as seniors. You can really tell the difference, when Doug and Michael [=DeLuise=] are in a scene together.
* ReassignedToAntarctica:
** Hanson feels this way about his (forced) transfer to Jump Street in the Pilot: he is transferred there because some incidents happened because he's too young looking to be a uniformed cop. When he hears it from the Chief, he originally is strongly opposed to it, saying he wants to be a real cop (meaning patrol/uniformed), "like [his] father was". The Chief makes it clear he must go to Jump Street, he does, he eventually likes it and we get the rest of the series.
** After Booker has violated many rules in order to [[spoiler:get the falsely convicted Hanson out of prison]], he is disciplined by being reassigned to a paper work job in the basement of the police library. Upon hearing that he immediately resigns from his job (and then becomes a private detective in his own spin-off series).
* RequiredSpinoffCrossover: ''Wheels And Deals: Part 2'':[[note]]"Part 1" was part of Bookers own spin-off series[[/note]] After Booker left the Jump Street team (In Universe) and got his own spin-off show (in Real Life), he returned a few episodes later to work with the team to catch the criminal ultimately responsible for the events that happened to Hanson and Ioki at the end of Season 3.
* RewatchBonus: The opening scene of ''Higher Education'' shows a teacher interacting with a girl of his class, Patti. The teacher seems casual and nice towards her, and he to be a popular teacher with the whole class. Later it turns out that he [[spoiler:had coerced another student, Joy, into sex and gotten her pregnant after which he didn't want anything to do with her anymore; plus he probably slept with other female students too]]. Knowing that and watching the opening scene again, you realize he's actually subtly flirting with Patti. FridgeHorror especially sets in when you realize Patti later is shown to be tutored by him at his own house, and that's precisely how [[spoiler:Joy had gotten raped and pregnant]]--Patti was probably next...
* RoadTripPlot: ''A.W.O.L.'' starts out as this, as Hanson and Penhall have to transport a military guy who dodged service. About halfway through though, [[spoiler:the military guy escapes and Hanson and Penhall are lost and stuck in the wilderness and the cold]].
* SchoolyardBullyAllGrownUp:
** In the episode ''Woolly Bullies'', the main characters recount the bullies who have plagued them in their youth. When Doug Penhall recounts his particularly bitter memories of such a tormentor, a friend suggests he seek the bully out and confront him. However, when Penhall does just that by finding the bully's current home, he learns that the bully is now a pathetic unemployed loser with an unhappy marriage to a shrewish wife. Delighted at this turn of events, Penhall decides not to speak to him and returns home quietly gloating how he got the classic best revenge by living well.
** He even suffered a case of ThrewMyBikeOnTheRoof.
* ScrewThisImOutOfHere:
** Penhall sets up Hanson for a double date with his [Penhall's] girlfriend, and his co-worker Jackie, whom he [[ShipperOnDeck wants to set up]] Hanson with. The DoubleDate very quickly turns sour with Hanson and Jackie bickering over work issues, upon which Hanson simply announces "I'm gonna go", and leaves, leaving a confused Penhall and Dorothy behind with a half-finished dinner.
** ''Eternal Flame'': Hanson encounters an ex-girlfriend (by now married to someone else) and relives romance with her; [[spoiler:at first the romance seems to be played straight / real, but at the end, even though Hanson goes straight for her, she denounces ''both'' her husband and Hanson, says she "needs to choose herself", and leaves town]].
* SequelEpisode:
** Also in the pilot episode was a criminal character who Hanson arrested--Reggie. This guy suddenly shows up again in a Season 2 episode to take revenge on Hanson.
** Early in the series, Ronnie Seebok is a criminal who crosses paths with Hanson. In Season 4, we see more of his background and follow his (downer) fate: he's on death row and reaches out to Hanson (who earlier in the series arrested him) for support.
** In ''Wheels and Deals'', the whole team goes after the man who ultimately was responsible for Hanson getting [[spoiler:wrongfully convicted for murder and Harry nearly dying]] nine episodes earlier in ''Draw the Line''.
* SeriesContinuityError: ''Things We Said Today'' has a minor one, at least if episodes are assumed to be set in the same year they aired. A flashback to the day of the Challenger Explosion in January 1986 shows Ioki working a case and the Jump Street squad commenting on Captain Fuller as if he were still new to the squad. The first episode of the series aired in April 1987; Captain Jenko was still in charge at that point and Hanson was just joining the squad.
* ShipperOnDeck:
** Penhall, in an awkward twist, is caught flirting with his co-worker Jackie by his girlfriend Dorothy. Penhall then, in an effort to control the damage, sets up a double-date in order to hook up Jackie with his best friend and partner Hanson. Almost ironically, Penhall and Dorothy break up soon afterwards while Hanson and Jackie get together and stay together during almost the whole rest of the season.
* ShotInTheAss: Happens to Hanson in ''The Dragon and the Angel''. Even worse, it turns out to be Penhall's fault.
* ShoutOut: A lot of episodes are named after, or based on '50s to '70s classic songs -- ''Things We Said Today'' (Music/TheBeatles), ''Chapel Of Love'' (The Dixie Cups), ''School's Out'' (Music/AliceCooper), ''Woolly Bull(ies)'' (Sam the Sham and the Pharaohs), ''Stand By Your Man'' (Tammy Wynette), ''(Re)search and Destroy'' (Iggy and the Stooges), ''Awomp-Bomb-Aloobomb, Aloop Bamboom'' (Little Richard's "Tutti Frutti"). There are also several examples of 1980s songs being used as inspiration for episode titles -- ''Tunnel of Love'' (Music/BruceSpringsteen), ''What About Love'' (Music/{{Heart}}), ''In the Name of Love'' (U2) and ''(My) Future's So Bright I Gotta Wear Shades'' (Timbuk 3). Although the song came out a few years after the episode, ''Loc'd Out'' ("Locked Out") was one of the first international hits for legendary Australian music group Crowded House.
* ShowerOfAngst: Officer Judy Hoffs plays this trope straight after one of the characters in the case she was working on rapes her. Despite knowing intellectually, as a detective, that this would destroy much of the evidence, she is too traumatised by the event to plan out her actions.
* TheSnackIsMoreInteresting: Hanson distracts himself with eating grapes when Judy finds him sitting at Fuller's desk and, understandably, asks him why he's there and where everybody else is. Hanson puts a grape in his mouth and answers with his mouth full. He's trying to brush her off to prevent her from knowing where the other cops are (unsuccesfully).
* SpookySeance: After a skeleton is found in the Jump Street chapel, the team (except for Hanson) use an ouija board and hire a medium, who supposedly channels the spirit of the dead body. He [[spoiler:quickly is exposed by Hanson as fraud though]].
* StalkerWithACrush:
** ''Don't Pet the Teacher'': A female, pretty young and attractive, teacher at a high school is stalked by continuously getting love notes and unwanted presents by an unknown admirer. At first she and the police suspect it's one of her high school students [[spoiler:but turns out it's the school's janitor]].
** ''What About Love'': Judy starts a romance with a man; when she finds out he actually is married and deliberately concealed that fact to her, she breaks it off. Upon which he turns into a stalker--keeping calling her despite her wishes, lying on a report he has to file about her / the Jump Street team, blackmailing her...
* StargateCity: Filmed in Vancouver.
* StarterVillain: Tyrell "Waxer" Thompson, a drug dealer harassing a client to pay overdue fees. He never returns after his arrest, but his {{Dragon}} Reggie does.
* [[StockYuck/{{Anchovies}} Stock Yuck - Anchovies]]: Played straight when a character orders pizza and threatens to kill someone else if there's any anchovies on it. Also see Hold The Unsolicited Ingedient.
* SuspiciouslySimilarSubstitute: David Barry Gray's Dean Garrett replacing Johnny Depp's Tom Hanson. However, he never got beyond recurring character [[spoiler: and he was later killed off in Season 5]]; Season 5's Tony [=McCann=] did somewhat better [[spoiler: in fact, he's the one who brings Garrett's killer to justice.]]
[[/folder]]

[[folder:TZ]]
* ATankardOfMooseUrine: Hanson must drink a few glasses of a bright green alcoholic drink when undercover at a fraternity. From the expression he has when doing this, it's clear that it tastes terrible. He also immediately throws up after the last shot, and afterwards Fuller remarks that he looks "green".
* TeacherStudentRomance:
** Played with with Johnny Depp's character, who is in his [[OlderThanTheyLook mid-twenties]] and not ''actually'' a student, but met and flirted with a woman just before he was actually assigned to her school and discovered she was now his teacher. For bonus points, this happens in an episode that frequently mentions Music/VanHalen.
** ''Higher Education'': A teenage girl tries to hide her relationship with a teacher by blaming her pregnancy on the now-disappeared boy she went to a school dance with: Ioki, undercover. [[ChocolateBaby Considering that both the student and teacher were white, if she'd had the baby it would probably have been evident that Ioki was not the father]].
* TeenPregnancy:
** ''Higher Education'' had a teenage girl that got pregnant by her school teacher [[spoiler: it then turned out to be date rape]].
** ''Don't Stretch the Rainbow'' was mainly about racial tensions at a high school and a relationship between a black girl and a white boy there (that they had to keep secret to avoid escalation of the racial tensions). The girl turns out to be pregnant, and she and the boy together tell the whole school not only about their relationship, but that they are also going to raise this baby together, no matter what, and that the other students should take this as an inspiration to stop the racial hate. Their message does seem to make an impact.
** ''Whose Choice Is It Anyway'' featured this prominently, since it was about pregnant teenagers considering whether they should get an abortion, against the backdrop story of violence against abortion clinics. There was one pregnant girl in particular that Judy befriended.
** ''Last Chance High'' subverted this. Hanson meets teenager Frances who shows him her baby. When he asks around at her school about "when [Frances] was pregnant", they reply "Uh no, Frances ''never'' was pregnant...". [[spoiler:Turns out the baby is not Frances' daughter, but her baby sister whom she kidnapped from her own parents]].
* ThatCameOutWrong: Judy and Doug, both acting impulsively, [[spoiler:make out and even almost have sex]]. Afterwards, Judy feels awkward about it and then accuses Doug of [[spoiler:deliberately having tried to seduce her--her reasoning being "you had a condom with you"]]--which might make her a hypocrite [[note]]Keep in mind that this happened at a time Aids was still a death sentence, and that Judy had already unintentionally gotten pregnant once before at 17.[[/note]], but Doug's answer to that [[NotHelpingYourCase doesn't help his case]]: he blurts out that he ''always'' has condoms with him ''just like you always have a spare tire in your car in case your car breaks down''. Causing Judy to answer "O great, so I am a road accident?!"
* TokenRomance:
** Hanson has a girlfriend, Amy, during Season 2; she only briefly shows up in three episodes [[note]]the one they get together; one scene at a Christmas dinner during the Christmas episode; and one scene in the episode she dies[[/note]], doesn't have any relevance to the plot [[note]]during she's alive, anyway; ironically it isn't until she dies that she becomes important (if only for one episode) to Hanson[[/note]], and they don't have chemistry or anything in common and Hanson isn't even attracted to her. It's telling that when she dies, Hanson mostly feels guilty about that he as a cop failed to overmaster the robber who shot her, rather than missing her as a person.
** Averted for Hanson's next girlfriend, Jackie, who was written in as a colleague of Penhall's, and who worked as a D.A., thus her work partially overlapped with Hanson's.
* VerySpecialEpisode: The show often dealt with hot-button issues, and often had a brief spot afterward with a phone number for the organization dedicated to addressing a particular social problem. Most notable examples:
** ''Best Years of Your Life'' is about suicide among teenagers.
** ''Whose Choice Is It Anyway?'' is about abortion, and violence against abortion clinics.
** ''2245'' is about a man getting the death penalty.
** ''The Girl Next Door'' revisited the topic of HIV. This example is particularly interesting, because it also showed how treatment (see Science Marches On on Trivia Page) and some attitudes towards HIV had advanced, even during the 2 or 3 years between the episodes.
* WhamEpisode: Season 4 ep. 4 ''Come From The Shadows'': Doug, who previously in the series had only had a serious relationship with Dorothy but otherwise was always pretty much a flirt with all women [[note]]including that he almost slept with his co-worker Judy[[/note]], falls seriously in love with and marries an El Salvadorian woman. She is extradited out of the U.S. by the end of the episode and in a WhatHappenedToTheMouse manner, isn't mentioned in any way for 14 episodes; then ep. 18 ''La Bizca'', another WhamEpisode, shows Doug and Tom going to war-ridden El Salvador to look for her [[labelnote:spoiler]]only to find out she has been murdered, but at least this gives Doug some closure.[[/labelnote]] For the remainder of the season, her entire existance is again ignored (though Doug adopts and cares for her nefew Clavo).
* WhatDoesSheSeeInHim: Not a romantic, but a platonic and same-sex example. In Universe, other characters (a.o. Penhall, Fuller and the Sheriff) repeatedly wonder how on earth Russell Buckins can be Hanson's friend. Russell is a polar opposite from Hanson--reckless, impulsive and wacky--and the other characters worry because under the influence of Russell, Hanson, totally out-of-character, neglects his job and even does unlawful things.
* WoobieOfTheWeek: In many episodes. Some of the most prominent:
** A criminal guy who gets a death sentence (in an interesting twist, earlier in the series he's featured as a pretty much one-dimensional criminal; by the 4th Season, he ends up getting the death sentence for his murders and a whole episode is devoted to showing his backstory, drawing some sympathy from the viewer).
** A family Officer Judy coincidentally finds out physically abuses their teenage children (her Captain Fuller wants her to stay out of it, but she insists on helping the teenage children who are battered).
** Mike from the Season 4 episode "Mike's P.O.V.": A teenage boy who murders the wife of his teacher for money; the episode explains his back story, which is that he has a major crush on one of his class mates, and it's implied he only did it to impress her.
** Kyle, the antagonist of "Things We Said Today": His life wasn't all that great when he met Ioki; but Ioki's friendship directly influenced him into making a decision whose consequences sent his life straight to rock bottom. [[spoiler: after finding out the whole story, Ioki ''agrees''; when Kyle is charged over his holding Ioki at gunpoint, Ioki tries to speak on Kyle's behalf in court, but the judge throws out Ioki's offer of testimony. Ioki pleads with Kyle to speak up on his own behalf, but Kyle silently refuses; it's a testimony to Keith Coogan's performance that he gets across without words that he's had more than enough of Harry Ioki's 'help'.]]
** Then there's Lisa Burbank, in ''In The Name of Love''; she's an outcast at school because of her HollywoodNerd image, plus rumors that her father's a criminal--which she fiercely denies. [[spoiler: But when she's visiting her father at his business warehouse, it's raided by the FBI & police--and she recognises one of the officers in the raid as the new kid at school... the cute guy who became her first friend in years, and who she even asked to have sex with her! Then undeniable proof is found that the father she's so loyally defended is a drug smuggler, and very likely guilty of everything he's been accused of (and the viewer knows that he's guilty of at least one murder)... and the only person willing to comfort her is said undercover cop, who pulls her into a tear-stained CoolDownHug as her father is led away in handcuffs.]]
*** and Mac borders on Woobie territory in this ep, himself. 'Persuaded' by the FBI into taking this particular undercover assignment, at the same time he's trying very hard to reconcile with his visiting ex-lover, Samantha. Mac feels uneasy about targeting Lisa to get to her father right from the start, and becomes even more so as the ep progresses, because Lisa really is a nice girl who he honestly likes. [[spoiler: But Lisa runs into Mac attending a business function with Samantha as her date. Lisa throws a fit, which not only blows his cover, but brings down criticism from the FBI. While he manages a last-ditch idea to justify a raid of Burbank's warehouse, he has to watch Lisa, who he's genuinely grown fond of, becoming more and more upset. After Burbank is arrested, he comes home to find his ex packing her bags; she's decided that she can't deal with his career.]]
* YourCheatingHeart:
** ''What About Love'': Judy Hoffs starts a romance with a man. Turns out he is married and deliberately concealed that fact to her. She brakes it off, only for him to turn into a StalkerWithACrush. Also an OfficeRomance gone bad, as he, in retaliation to her breaking the romance off, lies on a report he has to write about her and the Jump Street team.
** ''Eternal Flame'': Hanson runs into an ex-girlfriend, Linda, who's now married. That doesn't stop Linda from sleeping with and dating Hanson. Hanson and her are unaware that her husband actually knows of their affair, and it ends with [[spoiler:the husband attacking Hanson with a gun as a retaliation for Linda's cheating on him with Hanson; after which the husband is overmastered and arrested for his selling drugs, and shipped off; and Linda then [[ScrewThisImOutOfHere leaves town and]] ''both'' her husband and ex Hanson]].
** In an episode Judy's mother shows up, turns out she cheated on her husband / Judy's father. They get back together in the end though.
[[/folder]]
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