[[caption-width-right:283:[-Welcome aboard the Enterprise NX-01.-][[note]]From left to right: Malcolm Reed, [[TheSpock T'Pol]], Travis Mayweather, [[TheCaptain Jonathan Archer]], [[CunningLinguist Hoshi Sato]], [[TheEngineer Trip Tucker]], and [[TheMedic Dr. Phlox]].[[/note]]]]

->''"On this site, a powerful engine will be built. An engine that will someday help us to travel a hundred times faster than we can today. Imagine it -- thousands of [[PlanetOfHats inhabited planets]] at our fingertips... and we'll be able to explore those strange new worlds, and seek out new life and new civilizations. This engine will let us go boldly... [[MythologyGag where no man has gone before]]."''
-->-- '''Zefram Cochrane''', from a [[TheCameo video recording]] shown in the pilot

''It's been a long road, getting from [[Series/StarTrekTheOriginalSeries there]] to here...''

''Star Trek: Enterprise'' is the fourth SpinOff of the long-running ''Franchise/StarTrek'' franchise. It ran from 2001-2005.

ENT is a prequel series set in the 22nd century, around 100 years before ''Series/StarTrekTheOriginalSeries''--though in practice, it worked better as a [[{{Interquel}} semi-sequel]] to ''Film/StarTrekFirstContact'', as hinted by the early appearances of Creator/JamesCromwell and ''[[Series/StarTrekTheNextGeneration Next Generation]]'' aliens like the Nausicaans, Borg and Ferengi. Nearly one hundred years after Dr. Cochrane's historic warp flight, Captain Jonathan Archer is put in command of the ''Enterprise'' (NX-01), a cutting-edge warp 5 starship. The key selling point of this series was that space travel was not as casual as it became later in the chronology; most ships hadn't even left Earth's solar system. Unlike the previous ''Trek'' series, these crewmembers were also prone to swear and [[{{Fanservice}} walk around in their underwear]]. The series only lasted four seasons, making it the shortest-lived ''Star Trek'' since ''[[WesternAnimation/StarTrekTheAnimatedSeries The Animated Series]]'', and the [[FollowUpFailure shortest-lived live-action series]] in the franchise other than the original.

The ''Enterprise'' is the first ship designed for exploration, and thus the first to visit many worlds in Seasons 1 and 2. The Temporal Cold War arc was also introduced during this time, tying back into the "[[TimePolice Department of Temporal Investigations]]" introduced in previous ''Star Treks'': Factions in the future were using time travel to [[MakeWrongWhatOnceWentRight rig history]] in their favour. This plot was forced on the writers by [[ExecutiveMeddling the network]]--presumably so as to avoid the [[ForegoneConclusion lack of suspense]] expected from a prequel series. Still, even the showrunners didn't care for it, so it unfortunately just pops up from time to time before being [[AbortedArc terminated]] the moment the executives lost interest.

During season two, there was a sharp decline in viewership which led to a {{retool}} in season three: An alien race called the Xindi attacked Earth under the guidance of a [[OmniscientCouncilOfVagueness rogue element]] from the Temporal Cold War arc. ''Enterprise'' was refitted into a [[DarkerAndEdgier heavy-duty battleship]] and sent into a chaotic region of space called the Expanse to enter negotiations or, failing that, to stop further attacks against Earth. This season dealt with the moral compromises the crew had to make, as well as coming to terms with the [[TheWarOnTerror post-September 11th]] realities of network television.

At the start of Season 4, most of the writing staff was replaced and a new head writer, Manny Coto, was put in charge. This resulted in significant changes. Instead of a season-long arc, most stories were spread over 2 or 3 episodes at a time. Standalone stories were dropped, more or less [[ContinuityCreep entirely]]. This season dealt with the fallout of the Xindi attack, with many humans becoming violently xenophobic, and a brewing war with the as-yet-unseen Romulan Star Empire (which is a well-established part of ''Trek'' canon). But the most popular arc dealt with social reform on Vulcan--a piercing look into their culture, the likes of which hadn't been done since The Original Series.

Sadly, Creator/{{Paramount}} had no serious intention of renewing the series after Season Four. The writers had been batting around ideas for where things would have gone in Season Five, some of which are realized in the novel {{continuation}}: ''Literature/StarTrekEnterpriseRelaunch''.

Ironically, ''Enterprise'' is, by all indications, the only ''Star Trek'' series to take place in both the "old" timeline -- comprising the prior shows and movies -- and the "new" timeline subsequently created by ''Film/StarTrek (2009)'' and ''Film/StarTrekIntoDarkness'', with its presence in the former timeline being confirmed by the series finale, and mentions of the now-Admiral Archer and a model NX-01 establishing its presence in the latter. The third film of the "Kelvin" timeline, ''Film/StarTrekBeyond'', featured many references to the ''Enterprise''-era and the technology used during the series. Though creators Rick Berman and Brannon Braga suggested early in the show's run that it took place in alternate universe from ''First Contact'', later episodes [[FlipFlopOfGod disregarded it]] and slotted in perfectly with the series' continuity, to the point where the DistantFinale took place on Jean-Luc Picard's ''Enterprise.''

Vote for your favourite episodes [[http://tvtropes.org/pmwiki/crowner.php/BestEpisode/StarTrekEnterprise here.]]

!!''Star Trek: Enterprise'' provides examples of the following tropes:


[[folder:Tropes #-G]]
* TwoDSpace: [[AvertedTrope Averted]] for once in "Acquisition". The Ferengi ship approaches the ''Enterprise'' from an angle unusual for the series.
* AbortedArc:
** There seemed to be the seeds of a plotline with the Tandarans, a race that had rounded up the Suliban and placed them in internment camps. Archer exposed a Tandaran agent and was drugged while the agent escaped. They were never seen again after Season 1.
** Phlox was meant to develop a romance with Ensign Cutler, which sadly had to be abandoned after the death of Cutler's actress.
%%* AboveTheInfluence: "Bounty"
* ActionGirl: T'Pol uses Vulcan martial arts to beat down some Klingons in "Marauders."
* {{Aesoptinum}}: Trellium-D (drug abuse), and [[{{Anvilicious}} Pa'nar Syndrome (AIDS)]].
%%* TheAestheticsOfTechnology
%%* AlienAmongUs: "Civilization", "Carbon Creek", "Observer Effect."
* TheAlliance: ''Enterprise'' helps form one in the fourth season, in what is clearly a precursor to the TheFederation ("Babel One", "United", "The Aenar").
%%* AllJustADream: [[spoiler:"Vanishing Point", "Doctor's Orders".
%%* [[AllYourBaseAreBelongToUs All Your Starship Are Belong To Us]]: "Silent Enemy", "Shockwave, Part II", "Canamar", [[DieHardOnAnX "Acquisition", "The Catwalk"]], "Chosen Realm", "Azati Prime."
%%* AlternateRealityEpisode: [[MirrorUniverse "In A Mirror, Darkly"]]
%%* AlternateUniverse: [[ForWantOfANail "Shockwave"]], [[BadFuture "Twilight", "E2"]], [[PuttingOnTheReich "Storm Front"]].
* AntagonistTitle:
** "The Andorian Incident": At the end, the real villains are revealed to be [[spoiler:the Vulcans]], but the Andorians are still the antagonist for the majority of the episode.
** "Silent Enemy": The enemy is an alien ship which attacks the Enterprise.
** "Marauders": The Klingons are the antagonists.
** "The Augments": The Augments are the genetically altered humans led by Dr. Arik Soong.
%%* AntiHumanAlliance: In the MirrorUniverse.
* ArbitrarySkepticism:
** The Vulcan Science Directorate has determined that TimeTravel is impossible. It is illogical to think otherwise.
** In the MirrorUniverse, they've also determined that parallel universes are impossible.
* ArsonMurderAndJaywalking: According to the inventor of the transporter, "People said it was unsafe, that it caused brain cancer, psychosis, and even sleep disorders."
* ArtisticLicenseBiology: "Dear Doctor." The fact that there is no such thing as [[GoalOrientedEvolution evolutionary predestination]] is the point that ''no'' team of Star Trek writers has ever managed to get through their collective heads. If a species evolved something fatal, that is an ''accident''. It's not something deliberate to make room for another species in that niche.
* ArtisticLicenseGeography: "Desert Crossing" shows Trip and Archer trying to cross a barren, sandy wasteland and suffering greatly under the hot noonday sun... while discussing, in the same episode, having been through desert survival training back on Earth. If they had actually taken real desert survival training, one of the first things they would have learned is that ''this is exactly why you don't cross a desert that way!'' Instead, you cross at night, when there isn't a hot sun beating down on you, and rest in your tent during the daylight hours.
** Trip does bring up in the episode that they were told to cross at night in training
* ArtisticLicenseGunSafety: Target practice frequently happens in the armory, where the ship's high-yield torpedoes and weapons are held. After target practice in "Sleeping Dogs," Hoshi points her phase pistol at Reed's chest while handing it back to him, breaking just about every rule of gun safety.
* ArtisticLicenseHistory: The alternate timeline in "Storm Front" makes use of this. The successful Nazi conquests of Europe and North America are made possible because Lenin was assassinated before Red October, ensuring Russia did not become communist. Except that anti-communism was the driving force behind the rise of fascism in Germany and Italy.
* ArtisticLicensePhysics: For one thing, Earth-like gravity on a comet, one of the characters breaks his leg after falling a yard or so.
* AsLongAsItSoundsForeign: In "Broken Bow", Hoshi says she doesn't think that Klingonese has an expression for "thank you", but ''The Klingon Dictionary'' includes the verb ''[=tlho'=]'' for "to thank" (in context it would be conjugated as ''[=matlho'=]'', "I thank all of you"). This may be Hoshi's mistake, but more likely it's a misplaced attempt to invoke LanguageEqualsThought.
* AscendedMeme: Fans coined the name "Future Guy" to refer to the otherwise unnamed mysterious leader of the Temporal Cold War who first appeared in the pilot and was known only as the "Humanoid Figure". Ironically the writing staff actually took this name and used it for the character.
* TheBadGuyWins: They did a BlackAndGrayMorality version of this for the MirrorUniverse episode "In A Mirror Darkly" with everyone being villainous in one way or another. The "heroes" were the Vulcans T'Pol and Soval, made sympathetic in part by their being a conquered people, but T'Pol is shown being rather cruel and manipulative in her own way, and both Vulcans are initially working for TheEmpire against TheResistance in any case. To make a long story short, they lose to the megalomaniacal version of Jonathan Archer, who's shown laughing and partying with his [[TheOldestProfession "Captain's Woman"]] Hoshi Sato as he celebrates his victory and prepares to take over as Emperor. To keep the ending from being completely disgusting, however, [[spoiler: Hoshi Sato gives him some poisoned champagne to drink, and then embraces Travis Mayweather as her new consort in front of Archer as he lies dying from the poison. Later, upon reaching Earth, she carries out what had been his plan, demanding that Starfleet surrender or be destroyed, and announcing that ''she'' is the new Empress.]]
* BareYourMidriff: In the MirrorUniverse the Enterprise crewman still wear the standard jumpsuits (with added BlingOfWar) but in homage to Uhura's {{fanservice}}-y outfit in "Mirror Mirror" the women wear a two-piece, including a high-cut shirt that shows off their taut abs.
* BiggerOnTheInside: In "Future Tense" a time travel pod with blue organic circuitry and a mixed species pilot, all of which harkens to the Trope Codifier.
--> '''Trip''': Malcolm, how can a ship be bigger on the inside than the outside?\\
'''Malcolm''': This gives space exploration a whole new meaning.
* BewareTheNiceOnes: As mentioned in HumansAreSpecial, Ambassador Soval reveals that this is part of why the Vulcans are so wary of Humans. They managed to rebuild their entire civilization in next to no time after suffering a worldwide nuclear holocaust, discovered Warp Drive (due to efforts of an eccentric drunk in a shanty-town, no less) and are now on the way to forming the precursor to TheFederation. The Vulcans are ''afraid'' of how fast humanity is progressing.
* {{Biodata}}: In the pilot episode, the Klingon courier Klaang carried [[ArtisticLicenseBiology information injected directly into his DNA]], concerning the Suliban's attempts to destabilize the Empire.
%%* BizarreAlienSexes: "Cogenitor"
* BlessedWithSuck: Archer tries to claim that this applies to the human race with his infamous "gazelle speech" at the start of the second season. While his basic point makes sense on some levels, his attempt to paint it as a ''good'' thing just comes off as ridiculous. Fortunately, T'Pol then steps in and makes the same argument in a much more articulate way.
* BondVillainStupidity: Malik must have seen every Bond film, and not picked up on what ''not'' to do. He decides to leave Archer on board Cold Station-12 and release all the diseases in storage five minutes after they leave, even after [[WhyDontYouJustShootHim shooting his weakling brother]]. Soong calls him out on this when Archer shows up alive and well the next episode.
* BookEnds: The pilot episode opens with a young Jonathan Archer saying "where no man has gone before." The last line in the series also belongs to Captain Archer, getting the "To boldly go, where no man has gone before" line after Picard and Kirk's respective parts of the speech.
%%* BottleEpisode: "Shuttlepod One"
%%* BodySurf: "The Crossing", [[AncientTradition "Observer Effect"]]
%%* BodyHorror: "Extinction", [[PuppeteerParasite "Countdown"]]
%%* BountyHunter: "Bounty"
* {{Brainwashed}}: Hoshi (brain parasite), the crew ([[GreenSkinnedSpaceBabe space babes]] in "Rajiin" and "Bound"), MirrorUniverse Trip [[spoiler:(mind-meld)]].
* BrickJoke:
** The ''Defiant'' (from the ''Series/StarTrekTheOriginalSeries'' episode "The Tholian Web") makes an unexpected re-appearance over 37 years after that episode aired.
** In the alternate timeline where the Xindi destroy Earth, the last human colony is located on [[Film/StarTrekIITheWrathOfKhan Ceti Alpha V]]. The writers openly admitted to twisting the knife that much more - even if the humans were to somehow escape the Xindi, the colony would be destroyed anyways in less than a century.
* BrokenAesop:
** {{Deconstructed}} with T'Pol's Pa'nar syndrome. The Vulcan Mind-Meld subculture and related Pa'nar syndrome disease served as allegories for homosexuality and AIDS, including the scorn heaped upon the former and the stigma attached to contracting the latter. Archer and Phlox repeatedly expressed their distaste for the Vulcan bigotry related to this issue, but they themselves continually point out that T'Pol, who has Pa'nar Syndrome, is not a member of the Mind-Meld minority, and attracted the disease through a non-consensual attack. T'Pol eventually pointed out to them that, by attempting to "excuse" her having the disease, they are supporting and even justifying the DoubleStandard that the High Command has against the Mind-Meld minority.
** A straight broken aesop in "The Hatchery." A major theme of the Xindi arc is that humans and Xindi are NotSoDifferent; Archer has met several who are decent people that are either horrified to learn that they're involved in the deaths of millions or hold ''serious'' reservations about destroying Earth. When the crew finds an Insectoid ship with a hatchery, they conclude that the crew pulled a HeroicSacrifice to save the eggs. But Archer's comparison of insect eggs to humanoid babies and attempts to save the hatchery are portrayed as irrational, the crew has to mutiny, and the only reason he cared was because he got hit with egg gunk. So our enemies are people too... unless they're ''bugs,'' 'cause that's just weird. (It also nicely undercuts a general theme of Star Trek: even if life comes in an unfamiliar or creepy form, it deserves respect.)
** In "North Star", the theme of overcoming prejudice and tolerance is slightly undone as Bethany, the only person willing and able to give them ''any'' kind of respect and consideration is later revealed (for no reason) to be a [[HalfHumanHybrid quarter-Skagaran]] herself. As a result, the Sheriff [[TookALevelInKindness taking a level in kindness]] and becoming more tolerant is the ''only'' thing that preventing this aesop from being completely mangled.
* BugWar: One of the Xindi races is insectoid.
* CallForward: Numerous, with their own page [[CallForward/StarTrekEnterprise here.]]
* CeilingCorpse: An early episode has the away team board an unresponsive alien vessel. The place is already quite spooky when Hoshi spots its crew strung up from the ceiling, having their blood mechanically harvested.
* CelebrityParadox: The space shuttle ''Enterprise'' appears in the opening credits and as a drawing in Archer's ready room. In real life, it was named as such because of a write-in campaign by fans to have it be in honor of Kirk's ship; NASA had originally planned to name the shuttle ''Constitution''. Presumably, in the Star Trek universe, it was named in honor of the other American vessels named ''Enterprise''.
* CharacterOutlivesActor: Kellie Waymire died suddenly in 2003, but apparently, Crewman Cutler is still alive and well.[[note]]However, she was last mentioned in early Season 3, well before the Xindi attack which left a third of the crew dead.[[/note]]
* ClashOfEvolutionaryLevels: In an instance where nature does most of the work, the ''Enterprise'' finds a planet peacefully cohabited by two slightly different species at different evolutionary levels. The dominant species had a genetic condition which slated them to die out in a couple hundred years, while the lesser species was evolving to replace them. The ''Enterprise'' ultimately did not assist the dominant species as it would alter the planet's natural development. Comparisons to Humans and Neanderthals were made to justify this decision.
* ClearMyName:
** "Detained": Archer is detained under suspicion of leaking intel to the Suliban.
** "Canamar" Archer and Tucker are mistaken for smugglers.
** A Klingon Kourtroom episode, "Judgement", which also pays homage to ''Film/StarTrekVITheUndiscoveredCountry''.
* ColdBloodedTorture: How do you torture a Vulcan? [[spoiler: With a neural field that suppresses their ability to suppress their emotions.]]
* ColorCodedForYourConvenience: Enterprise's phase cannons and torpedoes are a bright orange in color. Andorians fire blue particle weapons (hardly surprising), and any enemy they engage, be it Klingons, Xindi, future-Nazis or even [[spoiler: Vulcans]], fire green beams and torpedoes.
* ComicBookAdaptation: A notable averting of the trope; as of 2014, ''Enterprise'' stands as the only ''Trek'' franchise series to not have had a single comic book adaptation.
* CommonalityConnection: In "United", Shran and Archer discover this about each other, after he inquires about the paintings of the various ships on the wall of his cabin. Archer explains they are vessels from across the centuries named ''Enterprise'', leading Shran to reveal that his ill-fated ship, the ''Kumari'', was similarly named after the first icebreaker to circumnavigate Andoria.
* CommunicationsOfficer: Hoshi's job. Her linguistics expertise also came into play because the Universal Translator was still a work-in-progress, it appeared to be operated manually, and given that we rarely see anyone using it, it's possible that Hoshi was either the only one able to operate it, or that it only partially worked, and Hoshi had to 'fill in the blanks' on her own. Unfortunately, the writers often couldn't find anything to do with her, and so she ended up doing random errands for several episodes. This was not helped as the show had an all but non-existent B-Cast for the first two seasons.
* ConquerorFromTheFuture: The Sphere-Builders. A [[PlanetOfHats whole race of them]].
* ConspiracyKitchenSink: Insinuated by "The Forge", "Awakening", and "Kir'Shara." Apparently, all the dickery the Vulcans play on the humans and Andorians has its roots in [[spoiler:reunification with Romulus]].
* ContinuityPorn: Season 4 is chock-a-block full of references to [=TOS=] and has encounters with the Organians, a Gorn, the Mirror Universe, and T'Pau.
* CosmeticallyAdvancedPrequel: Especially when compared to [=TOS=]. This is {{Handwave}}d in several places with explanations that smooth over the consistency issues with a couple of different theories - one is that the Enterprise is a very crude spaceship with no designer or creature comforts and all the technology out on display, while the look in [=TOS=] and other series are aesthetically-minded and designed to make things easier to use and less likely to break and come apart at the seams. This handwave is supported by the "Trials and Tribblations" episode of ''Series/StarTrekDeepSpaceNine'' which directly makes reference to [=TOS=] era have particular styles and designs, much as unique architectural styles such as art deco are referenced today.
* CouldHaveAvoidedThisPlot: "A Night in Sickbay". Porthos contracts a deadly disease, the NX-01 offends a major galactic power, ''and'' the ship is stranded and need of a rare component... because Archer brought his ''dog'' to a sacred grove of ''trees''. At least Tucker and T'Pol lampshade it.
* CowboyEpisode: "North Star" took place on a human colony in the Expanse. The culture there is bizarrely informed by the American west, a la "Spectre of the Gun" (TOS).
* CrazyCulturalComparison: The crew of the ''Enterprise'' causes a faux pas with an alien representative, who leaves in a huff, apparently disgusted by something. Eventually, Mayweather finds out that they find ''eating'' offensive. When asked how they do it, the alien explains that it's the same, but eating in the presence of others is a disgusting act for them.
* {{Crossover}}:
** Will Riker and Deanna Troi from ''Series/StarTrekTheNextGeneration'' in the final episode.
** While no actual ''characters'' crossed over, the Mirror episodes were a sequel to a ''Series/StarTrekTheOriginalSeries'' episode, and featured a TOS-era Federation ''Constitution''-class starship, fully stocked with uniforms and quite operational.
* CreatorProvincialism: Most notably in the opening sequence which showed the history of space exploration - America's space exploration. Yuri Gagarin who? Sputnik? Gesundheit.
* CultureClash: Frequently. Trying to shake hands with Vulcans, eating in front of Kreetassans, and a host of other first-contact mishaps.
* DeadGuyJunior: Trip and T'Pol's temporary baby, Elizabeth, after Trip's recently murdered sister.
* DecontaminationChamber: Transporters with bio-filters hadn't been invented yet and are viewed with suspicion anyway as brand new technology, so these get used. Really, given the 'bio-gel' used as a disinfectant, the real reason for this was for fanservice. The decon scenes all features the characters down to slightly more than their underwear rubbing each other.
* DelayedRippleEffect: Daniels says that massive changes in the timeline don't immediately alter the future. [[PlotHole Even though taking Archer to the future resulted in immediately destroying the future...]]
* DependingOnTheWriter: Characterization can vary greatly between episodes, most notably Captain Archer's varying tolerance for Vulcans.
* DesignatedVictim: Unlike actors playing previous Trek captains, Scott Bakula was more than willing to appear battered and bruised, until Archer getting thrown in prison and beaten up by interrogators became a series cliché.
* DistantFinale: Doubly so -- "These Are The Voyages..." is set in 2370, showing Riker and Troi observing events that took place in 2161 (when the previous episode took place in 2155).
* DoesThisRemindYouOfAnything: "[[RedAlert Reed Alert]], that's not bad"
* DoubleMeaningTitle: Referring to the ship itself as well as the "enterprise" of venturing into the unknown and going where no one-''ah you know the rest''.
* DoubleStandardRapeSciFi: The episode "Unexpected". Tucker becomes pregnant when an alien tricks him into activity which would be the alien equivalent of sex, impregnating him. Played for humor because of the [[MisterSeahorse male pregnancy]], and the fact that Tucker didn't give meaningful consent is ignored. Of course, the female alien would have had [[FridgeLogic no reason to suspect]] that Tucker's consent to sex didn't include an understanding of the consequences, as that was just normal to her. So, if you have sex with someone not your species, without having made a study of the risks this might entails (extensive biology classes), you've consented to unknown risks. The alien is very apologetic when she finds out, and didn't think impregnation was a possibility at ''all''. It still doesn't excuse the fact that Tucker was made fun of by the crew of the Enterprise and a crew of Klingons over it.
* DownerEnding: "Cogenitor" ends with the third-gender cogenitor committing suicide when they realize they'll never be able to experience the free life Trip showed them.
%%* DreamSequence: T'Pol gets one in Season 1's "Fusion"
* DreamSpying: Trip and T'Pol pop into each others dreams in one episode, despite being on different vessels.
* DrowningMySorrows: In "Shuttlepod One", Trip and Reed find the bottom of a bottle of bourbon after they're stranded in space facing a slow death.
-->"The Universe can laugh at us all it wants to; it's not getting my bourbon!"
* DuelToTheDeath: In "United", a [[RoaringRampageOfRevenge furious]] Shran declares this after the murder of his lover by one of the Tellarite ambassadors. Trying to save the conference, Archer, Hoshi and Travis figure out a [[LoopholeAbuse loophole]] in the rules to allow him to substitute Archer in the ambassador's place and find a non-lethal way to settle the duel, which still respects Andorian tradition.
* EarlyInstallmentWeirdness:
** "Broken Bow" features ''Enterprise'' using a blaster-like pulse weapon against the Suliban. It would never be seen again, with the ship's armaments being phase cannon and spatial torpedoes, and later on, photonic torpedoes.
** A couple of early episodes would have characters referring to their ship as "the ''Enterprise''." Besides one mention in "The Augments," no one would refer to ''Enterprise'' with the definite article. (Nor should they, any more than they'd refer to the captain or the doctor as "''the'' Archer" or "''the'' Phlox".)
* EnemyMine:
** "Sleeping Dogs" (''Film/DasBoot'' InSpace!), "Shadows of P'Jem", "Dawn", "The Forgotten", "Countdown", "Zero Hour", "Storm Front", "United."
** "Countdown" and "Zero Hour" have the [[HeelFaceTurn rebellious Xindi]] helping ''Enterprise'' fight the sphere-builders.
** In ''United'', Humans, Andorians, and Tellarites band together to stop the Romulans.
* ExtremeMultilingual: Hoshi. We find out in "Observer Effect" just how extreme: when she has nightmares, she cries out in her sleep ''in several different languages!''
* EstablishingSeriesMoment:
** The pilot episode "Broken Bow" has a Klingon crash on Earth in Oklahoma and was shot by a farmer with a plasma rifle that has the mechanical behavior of a lever-action shotgun. It gave the series a stronger TwentyMinutesInTheFuture tone that set it apart from other ''Franchise/StarTrek'' shows.
** For better or for worse, "Dear Doctor". For better in that it firmly establishes that the rule of conduct we've come to know in ''Star Trek'' (i.e. the Prime Directive) do not yet exist in the ''Enterprise'' era. For worse in that many fans chose this episode as the point where they abandoned ''Enterprise'' and televised ''Star Trek'' (if they didn't jump ship with "A Night in Sickbay").
* ETGaveUsWiFi: The second-season episode "Carbon Creek" implies that Velcro was given to us by stranded Vulcans. Doubles as a CriticalResearchFailure, as the [[https://en.wikipedia.org/wiki/Velcro invention of velcro]] is very well-documented.
* ExoticExtendedMarriage: Denobulans (both male and female) tend to have three spouses each. Dr. Phlox, the Enterprise's chief surgeon, thus had a total of 720 people he was directly or indirectly married to.
%%* ExpandedUniverse
%%* FailsafeFailure
* FalseFlagOperation: In "Kir'Shara", Archer reveals that [[spoiler:the embassy bombing was planned by V'Las to give them a pretext for rounding up the Syrannites and keeping the titular artifact from being found]].
%%* FamilyUnfriendlyAesop: ''Cogenitor'' and ''Dear Doctor'' both have these.
* FantasticRacism: A continuing theme of the show, as this {{prequel}} series dealt with mankind's initial reactions to new life and new civilisations. Early season episodes include the Suliban being [[TheWarOnTerror treated like potential terrorists]] because of the actions of the Cabal, the Vulcans' patronising attitude towards humans (and the human response to it), and [[WithFriendsLikeThese Commander Shran]] -- an Andorian who despises Vulcans and Tellarians, and even refers to his friend Captain Archer as "pinkskin" (along with all other humans; apparently he missed Hoshi and Travis). In "The Breach" Dr Phlox has to persuade a patient to receive treatment from him as the Denobulans committed atrocities against his species in the past, while Trip's attempt to help a repressed minority in a tri-gendered species has a tragic end. Virtually the entire fourth season touched on this trope in one way or another. Xenophobia on Earth increases after the Xindi attack, radical group Terra Prime tries to make political capital over the [[InterspeciesRomance Trip/T'Pol relationship]] by {{squick}}ing out humanity over the idea of Vulcan-human hybrids (even T'Pol's mother brings up "the shame" that such a mixed-race child would feel). And the whole {{Ubermensch}} thing naturally comes up with the genetically-superior Augments. And let's not even get into Vulcans shunning those who use their telepathic powers because they spread Vulcan AIDS...
* {{Fanservice}}: Mmm, let's see...
** The Enterprise [[DecontaminationChamber decontamination room]] exists mainly so the audience can see the main characters [[ShirtlessScene stripping down to their skivvies]] and [[MudWrestling rubbing decon gel]] over each other ([[ButNotTooGay provided they're not both men]]).
** The [[MarshmallowHell 'struggling-to-escape-our-bonds' moment]] in "Shadows of P'Jem."
** T'Pol's [[FutureSpandex catsuits]], that no Vulcan has ever worn before. (In the future; in the past, who knows?)
** {{Shirtless Scene}}s, usually involving either Captain Archer, or the well-muscled Trip Tucker.
** ShowerScene -- a zero-G surprise involving Captain Archer and a DaydreamSurprise ShowerOfLove involving T'Pol/Trip.
** Vulcan neuropressure: designed to make Trip relax while being massaged by a hot Vulcan chick with nothing on under her robe. Yeah, right.
** {{Green Skinned Space Babe}}s: Orion slave girls! [[AThreesomeIsHot Three of them!]] And there's Talas, a blue-skinned Andorian ActionGirl.
** The MirrorUniverse! "In a Mirror, Darkly" has both the sexual kind and fanservice for actual fans. It brings back the evil Terran Empire from the Original Series "Mirror Mirror", the USS ''Defiant'' is back ("The Tholian Web"), all the women have BareYourMidriff outfits (combined with the 1960s-style miniskirt), Hoshi sleeps around and gets into a CatFight with T'Pol, and a Gorn is bought back and made into a credible threat.
* FemmeFatale: Mirror!Hoshi becomes a rather unexpected example of this trope.
* FirstContact: Numerous instances, such as with the Andorians and several species only present in this series.
* FoodPorn: A considerable amount of time is dedicated to showing the food in the mess hall, along with the crew eating said food.
* ForgottenPhlebotinum:
** Time agent Daniels leaves a holographic database in cabin E-14 that only is accessed when Daniels gives permission. Justified, as Archer is probably inclined to not attempt to access it by force simply because it's probably well protected by extremely advanced technology. Not to mention, screwing around with time travel, even simply in the form of an information database from the future, is probably not a good idea. It's still odd that breaking in is never mentioned in season three, however, where the crew is often in extremely bad circumstances, where failure means the destruction of the Earth.
** Remember that Suliban Cell Ship that was capable of Warp 5, Cloaking and had a Tractor Beam, that they got in the Pilot? It took until Series 2 before they mentioned they were still trying to figure out its technology, but still, it seems it was relegated to the Enterprise's junk drawer since they are ''never'' mentioned again.
** Just think how much simpler the plot of "Minefield" would have been if someone had remembered they have a transporter beam that has already been successfully used on humans...
%%* FourTemperamentEnsemble: The bridge crew follows this formula pretty much to the letter, with the extra two coming into play as well:
%%** [[TheCaptain Archer]] is Choleric
%%** Tucker is Sanguine
%%** T'Pol is Phlegmatic
%%** Reed is Melancholic
%%** Sato is Supine
%%** Mayweather is Phlegmatic II
* FunWithAcronyms: United Earth's '''M'''ilitary '''A'''ssault '''C'''ommand '''O'''perations soldiers.
* GeniusDitz: Tucker. In "Shuttlepod One" it's shown that he doesn't understand simple algebra problems, which you think would be required reading for anyone who happens to be in charge of an matter/anti-matter reactor?!
%%* GeneticMemory
* GenreBlind: In ''Rogue Planet'', the viewer can immediately tell exactly what's going on when Archer hears an unfamiliar woman's voice calling out to him: it's a telepathic creature native to this world. Archer... not so much.
* TheGhost: Chef is mentioned numerous times over the course of the series, but he never appears.
* GladToBeAliveSex: It's implied that this has been going on on Earth on a planet-wide scale following the Xindi attack, with a record number of marriages and births over the next year.
* GoThroughMe: In the Vulcan arc, Trip (in command while Archer is missing on Vulcan) places the ''Enterprise'' between the Vulcan and Andorian fleets to try and keep them from doing too much damage to each other.
* GreenSkinnedSpaceBabe:
** In proud tradition...Orion slave girls return in the fourth season. [[spoiler:It turns out that they enslave their men with powerful pheromones.]]
** Talas the Andorian gets an honorable mention as a Blue-Skinned Space Babe.

[[folder:Tropes H-M]]
* HandshakeRefusal: Sub-commander T'pol does this to Trip Tucker in the pilot episode. [[JustifiedTrope Justified]] in that T'pol is a Vulcan, Vulcans being touch telepathic aliens who don't like touching members of their ''own'' species, let alone emotional humans. It pretty obviously doubled as a snub, however.
* HatePlague: The episode "Singularity" has the NX-01 approaching a black hole for scans, and the closer they get, the more they started to suffer from this as their SuperOCD obsessions clashed with each other.
%%* HeroicSacrifice: "Minefield", "Azati Prime", "Zero Hour", "These Are The Voyages..."
%%* HeroOfAnotherStory: Captain Erika Hernandez of the ''Columbia''.
* HeroesLoveDogs: Archer absolutely adores his pet beagle Porthos. In "A Night in Sickbay", he's willing to throw away humanity's burgeoning relations with the Kreetassans when Porthos becomes infected with a virus after visiting their planet. Admittedly, it's not a very good episode but it does illustrate how much he loves his dog.
* HeWhoMustNotBeSeen:
** [[EveryoneCallsHimBarkeep Chef]], [[FanNickname/LiveActionTV Future Guy]].
** For a long time Admiral Gardner, until he turned up in the MirrorUniverse. So it's He Who Must Not Be Seen In This Timeline.
* HilariousOuttakes: This was the first Star Trek series to have official season blooper reels compiled for DVD release.
* HoistByHisOwnPetard:
** The Sphere Builders, the Vulcans, the [[FalseFlagOperation Romulans]] and [[EvilutionaryBiologist Dr. Arik Soong]] try to plan to their benefit but end up causing the very events they're trying to avoid.
** The Klingons, who in their attempt to create Augments, ended up creating a virus that nearly wiped them out. In the end, they managed to find a cure, but this still left them [[MythologyGag no longer possessing cranial ridges]].
* HollywoodEvolution: As standard per ''Franchise/StarTrek''.
** "Dear Doctor" manages to provide an unusual instance of evolution being both the real life version, and the Hollywood version. The Menk are going to evolve into a superior lifeform to the Valakians, and so the Valakians 'evolve' a genetic defect to make room for them. So that the Menk can evolve due to their altered environment. Basically, it manages to mix GoalOrientedEvolution and evolution influenced by environment into a single plot point.
** However, in the end, the small bit of realistic genetics gets overshadowed by Hollywood inventiveness. Evolution (in simplest terms) is the accumulation of genetic traits and mutations passed into successive generations by natural selection and adaptation. In other episodes Phlox seems to understand the fact that as soon as you involve ''anything'' external to an ecosystem (technology, medicine... doctors) you are changing the parameters for selection and adaptation, however [[SelectiveObliviousness he doesn't seem to realize how this applies to the situation at hand]]. What is truly frustrating is that in nearly all other episodes Phlox actually shows a good understanding of medicine and ethics, so this drop into IdiotBall stupidity is particularly noticeable.
* {{Homage}}: In RealLife, the first Space Shuttle was called the ''Enterprise'', with the second being the ''Columbia''. In this series, the first warp-5 ship is called ''Enterprise'', with the second called ''Columbia''; and the semi-canon [[TrekVerse Expanded Universe]] materials indicate that the remaining warp-5 ships continued with the ThemeNaming (''Challenger'', ''Discovery'', ''Atlantis'' and ''Endeavour'').
* HotterAndSexier: Or at least, it tried to be. Unfortunately it was during its run that the "eww, girls are gross" fanbase and the "SF should have no romance" fanbase and the "shipper" fanbase and the "all romance in Star Trek is childish fanservice" all collided. The amount of gratuitous and really odd fanservice with things like "crewmen rubbing each other down half-naked with antibacterial cream in the decontamination chamber" that just left most people disgusted or really ''really'' confused didn't help either.
* HumanResources: The repair station in "Dead Stop" grabs a crew member from any ship it repairs and uses them to power itself. Travis is narrowly saved from this fate, but the others they find are too far gone.
* HumansAreDiplomats: While this era clearly stumbles occasionally, Series 4 has Starfleet begin to forge an interstellar alliance, even managing to unite the Vulcans and Andorians who have thus-far been at war for ''centuries''. With the Tellarites on side, this eventually leads to the formation of the Coalition of Planets, the precursor to TheFederation. Not that we actually get to see most of that...
* HumansAreSpecial: Like most ''Franchise/StarTrek'' series.
** Ambassador Soval and Admiral Forrest had a very interesting conversation in "The Forge" where Soval explains why Vulcans were so aloof and withdrawn to them despite being allies. Vulcans had a devastating world war and it took them sixteen hundred years to rebuild their race. Humans suffered a similar thing and within a hundred years discovered FTL travel, made contact with aliens, united as a single world government, solved world hunger, world poverty and eliminated all curable diseases. On top of that, they had started the makings of TheFederation. Vulcans were concerned that they could either be powerful allies or end up like the Klingons.
** Soval also points out that humans remind the Vulcans of their past violent and emotionally turbulent selves before they embraced logic. Little does Soval or Forrest know that there's another expansionist species descended from pre-logic Vulcans that fits this description -- the Romulans.
** The episode "Observer Effect" returns the Organians, who study how different species react to a silicon-based virus. It's explicitly stated that humans display more compassion in fighting the virus than any other species that has been observed in 800 years.
* {{Hypocrite}}:
** Purposefully invoked and deconstructed in "Damage", where Archer realises that in order to reach Azati Prime in time to prevent the Xindi from destroying Earth, he ''must'' engage in piracy and steal a replacement warp coil from the Illyrians. In other words, become [[NotSoDifferent no different]] from the Osaarian pirates from "Anomaly" that he so despised. This happens a couple of times in the Expanse, where Archer takes actions that he would never have dreamed of before and would have thought of as completely hypocritical when it was only his ship, crew and mission he had to take care of, but which become horribly necessary when the fate of his entire species (and throw in half the quadrant too) are on the brink of extinction.
** John Paxton, the leader of the xenophobic Earth organization Terra Prime. He had unwavering dedication to his cause, and was willing to scorch half of San Francisco to make his demands known. Considering this was after a devastating alien attack, their concerns about an alien alliance had some validity. T'Pol deduced from a trembling hand that Paxton had a genetic disorder, one that should have killed him when he was a teenager, but didn't because of "freely given" alien medical technology. Paxton will only admit that he's not the first leader to fail to live up to the standard of an idol (in his case, a mass murderer from Earth's post WW3 period), and refuses to back down. This fact exposed him as a man who was just racist.
** Archer's actions in "Fortunate Son" where he tirades against Ryan for seeking revenge against pirates who have repeatedly attacked his ship and nearly fatally injured one of his crew, compared to "Silent Enemy" where Archer seeks revenge against unknown aliens who have repeatedly attacked his ship and nearly fatally injured one of his crew. Bad enough already, but the latter takes place only ''two'' episodes later!
** On a more broad scale, Archer is always advocating open-mindedness and embracing other lifeforms, and yet as the series goes on, we find that he falls into the occasional habit of being suspicious, paranoid and almost hostile upon first contact with truly alien forms of life or humanoids that are very different from the human norm for absolutely no good reason (except maybe his "feelings"), while he is warm, welcoming and forgiving to more familiar humanoids for the exact same lack of reasoning. Sometimes his paranoia ends up being justified by the plot but not for any reason that he could determine beforehand. And this suspicion isn't around when he meets human-looking aliens who turn out to be devious, so you can't put it down to an indefinable sense of "gut" instinct. It edges onto WhatMeasureIsANonHuman in his interspecies treatment.
** In "The Breach", Phlox points out that Denobulan Medical Ethics prevent him from treating someone who does not want to be treated and that he ''must'' respect his patients wishes, even if they lead to their death. Which makes his actions in "Dear Doctor" even more shocking in retrospect, since the Valakians most certainly ''did'' want to be treated! Considering that throughout the entire series his upholding of Medical Ethics and his practice of medicine is completely consistent ''except'' for "Dear Doctor", this comes closer to a cross between IdiotBall and OutOfCharacterMoment (see IdiotBall for more), and in fact his actions and attitude in "Dear Doctor" are hypocritical in many ways when compared with the way he acts in the rest of the series, not just in patient autonomy and duty of care.
** Likewise Archer in "Dear Doctor". When all is said and done, ''he'' is quite happy for him and his crew to have the services of an ''alien'' physician with advanced bio-medical knowledge to assist them as they explore the unknown and have to deal with the health threats inherent in doing so. But helping the Valakians is "playing God"! When combined with his long-standing complaints about the Vulcans withholding their technology from humanity, it comes across as the pinnacle of hypocrisy since Archer is just fine with ''humans'' receiving alien assistance.
* IWantMyBelovedToBeHappy: Interestingly, ''both'' sides of a LoveTriangle do this for [[spoiler: T'Pol,]] a few episodes apart.
* IdiotBall:
** An in-universe version: the creator(s) of the Augments enhanced their aggression, ambition and tendency for violence (or in other words, all primal human instincts left over from basic humanoid evolution before higher cortical functions took over) and ''didn't'' make sure that their dis-inhibition wasn't lowered at the same time? How was that a good idea ''at all?'' These geneticists basically made sure that the reasoning and complicated thought processes inherent in the cerebral cortex (particularly the frontal lobes) that makes humans human (also the limbic system and capacity for compassion) was enslaved to uncontrolled primitive desires. In their Augments they reduced humanity to a primitive animalistic group-society with the added cruelty and violence of intelligent humans and the disinhibition to not control that cruelty or violence. All that their "higher intelligence" did was make sure that they lived in such a manner with advanced technology. [[SarcasmMode Yes, this was clearly the way forward for human evolution and genetic science]].
** In "The Expanse", unless Duras had caught up with them that very second, we have to assume that he'd ''intentionally'' waited until ''Enterprise'' had dropped out of warp in the Solar System before staging his ambush, instead of attacking them whilst in Deep Space. Naturally, this ambush occurring right in their own backyard means that [[TheCavalry Starfleet]] shows up in less than a minute.
** In "Bound", knowing that the Orion females are emitting a pheromone that allows them to manipulate the men onboard, they decide to lock them in the Decon Chamber as a safety precaution... then decide to post a ''male'' guard in the room with them.
* ImADoctorNotAPlaceholder: Phlox uses this one in "Doctor's Orders" when neither he nor T'Pol--the only crew members awake at the time [[NegativeSpaceWedgie because plot reasons]] feel qualified to operate the warp engine: "I'm a physician, not an engineer!"
* InferredHolocaust: [[InvokedTrope Invoked]] at the end of "The Communicator", where to prevent cultural contamination by revealing their alien origins, Archer lets a highly paranoid military power believe that they are genetically engineered super-soldiers from their enemy nation, with advanced particle weapons, sub-orbital craft that is not only invisible to radar, but the naked eye as well! Archer reflects at the end of the end of the episode, that despite preventing them from acquiring advanced technology, with all the political tension on that planet, chances are that they probably made things a lot ''worse!''
* InfiniteSupplies:
** The constant destruction/rebirth of Shuttlepod 1, the zombie shuttlepod.
** Mostly averted. Unlike ''Series/StarTrekVoyager'', damage inflicted in one episode ("Minefield") meant they had to pull into a space repair dock in the next ("Dead Stop"). And severe damage in the third season meant that for the rest of the season they spend time repairing the ship but almost anything more then a hiccup and the ship starts to fall apart again. As well, there weren't any starbases around and any damage to the warp drive meant that help was months or even years away.
** The alternate ''Enterprise'' from "E2" is shown as being even ''more'' battle-scarred, due to having spent over a century in the Expanse after being thrown back in time.
* InsaneAdmiral: Averted. Uniquely among the other Trek shows, ''Enterprise'' had a regularly occurring ReasonableAuthorityFigure in Admiral Forrest that the crew reported to. Even his Mirror Universe counterpart was largely honorable (going down in a HeroicSacrifice to give Archer time to complete the mission), if a bit brutal.
* InsaneTrollLogic:
** "Genetic predestination"... Star Trek has always had issues with the idea of "genetic predestination" - an idea which ''by its very nature'' is a logical fallacy - but in "Dear Doctor" is where the full force stupidity of it comes into play. Basing an entire episode on an idea which has no inherent sense whatsoever [[{{Understatement}} does not a good outcome make]].
** Archer does some pretty impressive rhetorical gymnastics to convince himself that the Valakians simply are not ready to handle warp drive technology yet, and won't be before they become extinct. This despite the fact that they have what is definitely a late-21st Century level of technological development and slower-than-light space travel, as well as what appears to be a peaceful civilization. As shown in ''Film/StarTrekFirstContact'', humanity's first warp drive spacecraft was designed, built and ''flown'' by a borderline alcoholic living in a post-WorldWarIII shanty town in the wilds of Montana out of salvaged materials in an abandoned missile silo! On what basis is Archer casting aspersions on the Valakian's being "ready"? Or does humanity privately acknowledge that there were fair odds that Cochrane might have blown up North America when he tried to launch the ''Phoenix'' and they just try not to think about it too much?
* InscrutableAliens: In the episode ''Silent Enemy'' the ''Enterprise'' encountered an alien ship that did not speak when hailed and soon turned inexplicably hostile.
* InstrumentalThemeTune: Disastrously averted. Enterprise was the only series in the Star Trek franchise that didn't use an instrumental theme. "Faith of the Heart" was poorly received. Many online petitions were submitted for its removal from the title sequence.
%%* InterspeciesRomance: "Dear Doctor", "Stigma", "Bound", and the [[OfficialCouple Trip/T'Pol relationship]].
* InvadedStatesOfAmerica: During the Temporal Cold War, intervention from aliens allowed the Nazis to invade the United States.
* {{Irony}}:
** [[ANaziByAnyOtherName Terra Prime]] are a human-supermacist organisation, which promotes openly racist, highly xenophobic rhetoric, as well as the belief in maintaining racial purity. This is despite the fact many of their members are shown to be from ethnicities subjected to the [[{{Hypocrite}} same kind]] of harassment, throughout human history. Of course, this was probably [[DoesThisRemindYouOfAnything the whole point]].
** In the MirrorUniverse episode, evil Captain Archer proudly shows off the shotgun Zephram Cochrane used to kill the first Vulcan who stepped onto human soil.
-->'''Archer:''' I wonder how history would have played out if Cochrane hadn't turned the tables on your [[WrittenByTheWinners invasion force]]. Humans might be your slaves instead of the other way around.
* IssueDrift:
** Season 3 - A not-so-negative example of this trope. The IssueDrift is worked naturally into the storyline and there are no instances of AuthorFilibuster or any [[StrawCharacter Strawman Political]].
** The season 4 Vulcan arc where [[DoesThisRemindYouOfAnything the Vulcan High Command is trying to destroy a religious extremist group hiding out in a remote desert encampment who supposedly bombed the Earth Embassy, while really the High Command is trying to justify a war with Andoria behind the scenes]], is the more explicit example of this trope.
** Then there's Terra Prime - quite figuratively a terrorist organization who values human supremacy over all other forms of life and who thinks interspecies offspring are an abomination, and that Starfleet is contaminating Earth by letting other species come and visit or live there. Turns out they have the same rationalizations and paranoia as every white-supremacist, anti-semetic, religious-extremist, misandrist[=/=]misogynist or any other group which believes they are superior to another group of human beings in the world today.
* JurisdictionFriction: In Season 3, Malcolm sees himself having this with Major Hayes, the commander of the MACO detachment. Oddly, he keeps this attitude even after fighting alongside the [=MACOs=] on several missions, including going in with Major Hayes on the kemocite facility.
* KissOfDistraction:
** Archer is undercover on a pre-industrial alien world, and doing some covert work alongside an alien female. When his UniversalTranslator breaks and he can no longer understand her, he smooches the woman to shut her up and distract her long enough so he can fix the translator behind her back.
** Played with later in the episode, where she reveals she realized he was fiddling with this translation device and just went along with it anyway, and at the end of the episode when they kiss for real and both of them joke that it's because his translator's broken again. She had no idea he was an alien the first time they kissed and he covered by claiming he thought someone was coming their way (they were hiding at the time).
* KlingonScientistsGetNoRespect:
** Well, Klingon Lawyers actually. In fact, this trope is actually brought up by the Lawyer, who is afraid he is seeing the destruction of his society thanks to the dominance of the warrior culture.
** Later on a Klingon Scientist - actually a Klingon Doctor - brings up a similar problem, that his house was a warrior caste and his family ''actually disowned'' him for becoming a doctor, even when he served in the Klingon Army as The Medic, and that the High Council delegates so few funds to medical research that he was not only forced to steal the Interspecies Medical Exchange database in order to help his patients, but he's not even allowed to ask for help from anyone because the Warrior Caste would see it as being weak, dishonorable and exposing their vulnerabilities to their enemies.
* KryptoniteFactor: Trellium-D, for Vulcans, who for the last five series seemed impervious or substantially more resilient to anything that harms or afflicts humans and other humanoids. That, and mating cycles.
* KudzuPlot: Once again, related to the "Temporal Cold War." Even the ''producers'' admitted they had no idea where it was going.
* LaserGuidedKarma: The Vulcans refuse to lend Humanity ''any'' aid during the Xindi Incident, even though the Earth is certain facing [[EarthShatteringKaboom destruction]] should the Xindi attack again. [[spoiler: The destruction of Vulcan in the new AlternateReality of ''Film/StarTrek'' could be considered severe karmic payback for this]].
* LawfulEvil: [[InvokedTrope Invoked]] by Sheriff [=MacReady=] in "North Star", who ([[TookALevelInKindness initially]]) defends keeping down the Skagarans because it's the law and chastises his [[CorruptCop Deputy]] for deliberately antagonising or murdering Skagarans simply ''[[ForTheEvulz for fun]]''.
* LegacyCharacter: The Enterprise herself. Archer and Shran discussed that both of their ships were named after prior vessels and wondered if their own ships would inspire other vessel names.
* LockedRoom: "Shuttlepod One" puts Trip and Reed in a stranded shuttlepod that's slowly losing power, and they hash out a lot of issues while waiting for death.
* LooksLikeOrlock: The Na'kuhl.
* LostColony: "Terra Nova" has the crew find a lost human colony that's been driven underground and despises their homeworld thanks to radiation and a misunderstanding.
* TheMainCharactersDoEverything: In the first seasons the ''Enterprise'' lacked a B-cast, meaning that they really did do everything. This includes Archer serving as a nurse, not having anyone trained to use the brand new, [[TeleporterAccident notoriously unreliable transporter]], and sending Hoshi around to do random inconsequential jobs as though she were an intern.
* MadeOfIron: Archer seems to repeatedly forget that Vulcans have superior strength and stamina than humans. Naturally, his attempt to try and out-jog T'Pol in "A Night in Sickbay" fails spectacularly.
* TheManBehindTheMan: Future Guy in the first couple seasons, the Sphere Builders in Season 3.
* MarshmallowHell: In "Shadows of P'Jem", Archer gets a faceful of T'Pol's, umm...'class-D planets' as the pair struggles to escape their ropes.
%%* MasterOfIllusion: "Exile", [[FakedRipVanWinkle "Stratagem"]]
* MauveShirt: Major Hayes. Also Commander Kelby, [[spoiler: Trip's replacement as chief engineer.]]
* MedicalDrama:
** "Dear Doctor" has Dr. Phlox confront an ethical dilemma based on Trek writers' usual poor understanding of evolution when they find a species with a genetic disease.
** "Stigma" is an [=AIDS=] allegory when T'Pol is found to have a disease contracted from mind-melding, which is described as "a deviant practice" by this era's Vulcans.
** [[WhatMeasureIsANonHuman "Similtude"]] is another ethics conundrum; when Trip dies, Phlox creates a fast-growing clone to harvest organs from.
%%* MindRape: "Fusion", "Countdown"
* MistakenForSpies: "Communicator". Malcolm accidentally leaves his communicator behind on a pre-warp planet that's on the brink of war. He and Archer go back to retrieve it, and are assumed to be spies from the other side of the war.
%%* MisterSeahorse: "Unexpected"
* TheMole: Archer's steward Daniels turns out to be a time agent from the 31st century. [[spoiler: Malcolm Reed works for an early incarnation of [[Series/StarTrekDeepSpaceNine Section 31]], while reporter Gannet turns out to be working for Starfleet Intelligence and Ensign Masaro for radical Earth group Terra Prime]].
* MoralDissonance:
** In "Dear Doctor", Archer and Phlox are holding a cure to a disease that will almost certainly wipe out one race of intelligent life and, in their absence, force the other (less intelligent, but still sapient) race to evolve (That is to say, die off in great numbers while they slowly get smarter over millennia). They decide to keep this cure to themselves, dooming one race to extinction, and another to the cruel ravages of natural selection, and call it the moral thing to do.
** "Observer Effect" brings this issue up again, as almost the exact same situation occurs. Two crew members, Trip and Hoshi, [[TooDumbToLive were digging around in an alien garbage dump without protective gear]]. Before too long they have already died from an exotic disease, and Archer is dying as well. A pair of Organians are watching this as a study of "lesser life forms". Archer wants them to ''figuratively'' play God and bring Trip and Hoshi BackFromTheDead, even berating the Organians for not already saving them from the disease when they could easily have done so. While doing this, he continues to defend his actions in "Dear Doctor", despite the similarity of the situation. Apparently, Archer thinks leaving an entire species to die from a medical problem is okay, but leaving him and his crew members to die from a disease they carelessly picked up is immoral and ''unforgivable''.
** As a general rule, if an alien species is ''more'' advanced than humanity then Archer sees no excuse for them to not share their knowledge or render their assistance. However, if they are ''less'' advanced then "interference" is unjustifiable and humanity is righteous in withholding anything they choose. This would later become a core part of how the Prime Directive would be interpreted.
* TheMountainsOfIllinois:
** In the pilot episode we are treated to Klingons running across the Great Plains of Broken Bow, Oklahoma. Broken Bow is a real place in the hilly, heavily forested southeastern corner, one of the few areas of the state that actually DOESN'T look like this.
** A literal example of the trope is in "Carpenter Street," which takes place in Detroit and ends with a shot of some mountains which aren't within a hundred miles.
* MrFanservice: Trip took his shirt off enough times to count for this. He's reduced to his undershirt and underwear on three separate occasions in season one alone. He even spends half of one episode saving the day wearing this under combo. Of course this doesn't compare to T'Pol's complete nudity...
* MsFanservice:
%%** T'Pol.
** Mirror Universe's [[ReallyGetsAround Hoshi Sato]], proof that EvilIsSexy.
** Hoshi crawls through a Jeffries Tube, but manages to lose her shirt on her way out.
%%* TheMutiny: "Hatchery"
* MythologyGag: There were three major Admirals in the series, Admiral Forrest, Admiral Leonard and Admiral Williams. The original series PowerTrio was [[TheKirk Kirk]] (William Shatner), [[TheSpock Spock]] (Leonard Nimoy) and [[TheMcCoy McCoy]] ([=DeForest=] Kelley). Kelly was the first of them to pass away; Admiral Forrest is the most prominent of those Admirals in the series.

[[folder:Tropes N-S]]
* NeverTrustATrailer: Season 2 had trailers for three episodes ("A Night in Sickbay", "Cogenitor", and "Bounty") portrayed as light-hearted, sex-filled episodes. Sickbay was a disaster, and Bounty had the sex stuff as a cheap b-plot. Cogenitor, on the other hand, was very dark, but also critically very well received. "Cogenitor" actually tried to analyze the moral questions of oppression and whether non-interference is the best course of action, and is generally considered one of the few standout episodes from the first three seasons. It's just that fans look back and chuckle at how goofy the trailer looked.
* NoNewFashionsInTheFuture: Civilians and government officials typically dress in a style virtually identical to early 21st century (that would be now) business formal. Of course, this was kind of an intentional choice to highlight how this prequel series was only a hundred and fifty years from our present day.
* NoOSHACompliance:
** ''Enterprise'' has handrails that could accidentally sever fingers ("Unexpected"), the De-Con chamber is not located anywhere near the airlock, doesn't have a proper seal and can be hotwired to open from the inside ("Acquisition") and the manual overrides to vent plasma fires can only be reached from the ''outside'' of the ship ("Forgotten"). Furthermore, the highly dangerous and very experimental transporter doesn't have an officer specifically trained in it's operation ("Strange New World").
** In "Shockwave", the Enterprise crew are visiting a colony planet that, due to technobabble, is capable of blowing up if proper landing procedures are not taken. This would be bad enough, but on top of that, instead of having dedicated ships and pilots to transport visitors, they just let the Enterprise enter their atmosphere with no more precautions than an instruction manual.
* NoPlansNoPrototypeNoBackup: Averted with the Xindi weapon. They build two prototypes, one of which is used to attack Earth and another mostly destroys a moon. By the end of Season 3, Archer is concerned that destroying the weapon will only result in the Xindi building another, which is why he tries to convince Degra and other council members to make peace. In addition, Degra was cunning enough to encrypt the schematics so it could not be easily rebuilt.
* NobleDemon: Shran is generally portrayed this way. He's as suspicious, paranoid and ruthless as Vulcans accuse Andorians in general of being... but he has a conscience, and can always be trusted to do the right thing in the end, even if he takes a long, circuitous, and sometimes ''cruel'' path getting there.
* NothingIsTheSameAnyMore: The Xindi attack on Earth in "The Expanse."
%%* NotImportantToThisEpisodeCamp: Porthos.
* NotReallyABirthScene: In an episode, Dr. Phlox is putting Malcolm through some physical therapy for a leg injury, and it looks a lot like a birth scene, including Dr. Phlox telling Malcolm to push.
* NotSoDifferent:
** When Trip rants about Orion slavery in "Borderland," Soong points out that someone with such a strong Southern accent probably has ancestors who had a hand in the chattel slavery of their own time. Of course, that's not likely to be true unless Trip's ancestors were among the very richest families of their day, but Soong scores the point nonetheless.
** There's a subtle moment inn "The Forge" when Archer has a little chuckle as T'Pol relates the difficulties that have arisen between Surak's time and the present.
---> '''T'Pol:''' Over the centuries, his followers made copies of his teachings.\\
'''Archer:''' Let me guess: with the originals lost, whatever's left is open to interpretation.\\
'''T'Pol:''' You find this amusing?\\
'''Archer:''' I find it familiar.
* {{Novelization}}: The series' first episode, first season finale and second season finale were all adapted as novels. ''Enterprise'' is the only TNG-era series not to have its series finale adapted as a book.
%%* OfficialCouple: Trip and T'Pol, in the third and fourth season.
* TheOneWith: "Regeneration". Known fondly as the "The One With The Borg".
* TheOnlyOne: Fully justified for once. When Captain Archer says that NX-01 Enterprise is being sent to a crisis in the Borderland because they're the "fastest ship with the most experienced crew" he's right - Enterprise is the first human vessel capable of Warp 5 (most others are around Warp 2). The NX-02 Columbia isn't available till mid-way through the fourth season, and its most experienced crewmember is an officer who transfers over from Enterprise.
* OutgrownSuchSillySuperstitions: In "Cold Front", Trip apparently was under the impression that religious aliens must be automatically SpaceAmish, leading him to spend some time explaining the Warp Reactor in simplistic terms to a group of Borothan pilgrims, before one of them politely informs him that he's actually a ''warp field theorist''.
* PardonMyKlingon:
** Hoshi cusses T'Pol out in Vulcan in the pilot. T'Pol's response is something along the lines of "Very impressive, but I thought we were speaking English on this journey."
** From the episode "Terra Prime" (a basic form of UT had just been invented by Hoshi):
--->"There are protesters chanting outside the Andorian embassy. And they're using words that aren't in the universal translator!"
* PiggybackingOnHitler: In "Storm Front", the Na'kuhl find themselves back in time on 20th-century Earth, during World War II. They side with the Nazis, offering to build advanced weapons in exchange for the resources they need to build a time machine. When the Nazis complain that the Aliens aren't helping them enough, the alien leader lampshades the trope by bluntly stating that the Nazis conquer countries; they conquer ''planets''.
* PlanetOfHats: Generally averted with the writers trying to give some depth to each. Most notably, the Klingon lawyer, who laments how the warrior caste so dominates his society.
* PlasmaCannon: Used by the Enterprise before being replaced with Phase Cannons.
%%* PreciousPuppies
* PrisonShip: One episode had Captain Archer and Trip aboard one of these. The other criminals launched an escape and killed the guards, forcing them to make themselves useful to the criminals in order to survive. It was basically ''Film/ConAir'' InSpace.
* ProtagonistCenteredMorality: Archer specifically. The show tends to go to great lengths to emphasize the good that will come from his actions in the future (i.e. the creation of the Federation) in order to rationalize away all the morally-dubious things he does in his present. He is also the subject of admiration in-show for the results of what his actions (especially when they benefit Earth), and is frequently praised and respected by other characters. This despite the fact that he often performs acts that he himself denounces others for doing and is incredibly arbitrary about what his values are.
* ProudWarriorRaceGuy: The Klingons, who because of the earlier time return to being the bad guys, or at least on much less friendly terms. In "Judgement" their warrior race status is deconstructed by a Klingon lawyer describing the culture degrading into pure warrior status, which leaves a large hole in the community for little things like [[KlingonScientistsGetNoRespect doctors, lawyers, school teachers]]...
* ProxyWar: The Temporal Cold War had a future version of the Federation opposed to the Na'kuhl and the Sphere Builders, each of whom backed various factions in the 22nd century with the goal of tampering with the timeline to either ensure the Federation would form or prevent it from forming.
* RealSongThemeTune: The theme "Where My Heart Will Take Me" ([[RefrainFromAssuming not "Faith of the Heart" as widely believed]]) was originally from the soundtrack of ''Film/PatchAdams''.
* RedEyesTakeWarning: "Storm Front".
* RedShirt:
** The crew never suffered any fatal casualties in the first two seasons (despite incidents like a Romulan stealth mine blowing away a section of the hull), no doubt to avoid the 'phaser fodder' cliche. All this changed in the third season Xindi war arc with 27 crewmen killed. The trope is lampshaded in "The Forgotten", when Trip has to write a letter to the parents of a dead crewmember but [[ForgottenFallenFriend can't remember much about her]], so he keeps getting her mixed up with his dead little sister. There's also two classic redshirt incidents: in "The Council" three main characters and a MACO enter one of the mysterious Spheres, and in Season 4 "Daedalus" Reed goes searching through a dark room for a NegativeSpaceWedgie with an unnamed crewmember -- no guessing who gets killed on both occasions. Deliberately parodied in [[MirrorUniverse "In A Mirror, Darkly"]] where Mirror Reed puts on an [[Series/StarTrekTheOriginalSeries Original Series]] redshirt with near-fatal consequences.
** This trope is played for drama after the aforementioned incident in "The Council". Malcolm Reed, usually TheStoic, is shown to be really very upset by the number of crew members ''Enterprise'' has lost since entering the Expanse and the seeming lack of response his fellow senior officers have to the most recent MACO death, and he worries that they're getting too used to losing people.
* RefugeInAudacity: Archer in "The Augments", bluffing his way out of an encounter with a Klingon patrol ship by pretending to be a top-secret Klingon cruiser with the chancellor on board!
* RenegadeSplinterFaction:
** It's revealed that the Suliban Cabal is this, as many Suliban don't agree with their goals. [[PlanetOfHats Didn't stop others from lumping them all in the same group]].
** Terra Prime for Humanity, a bunch of xenophobes who want to eject aliens and sever diplomatic relations with them thanks to the Xindi attack.
** The Syrannites are this for Vulcans. Subverted as it's revealed that instead of the [[YourTerroristsAreOurFreedomFighters radical terrorists]] they're portrayed as by the Vulcan High Command, they're actually a pacifist movement who desire to return the Vulcans back to the original teachings of Surak. [[spoiler: And they ''succeed'']].
* ReptilesAreAbhorrent:
** You get ''no points'' for figuring out which of the Xindi species doesn't turn good, and there's a clear ShoutOut to the miniseries ''Series/{{V 1983}}'' when the Xindi Reptilians snack on live mice.
%%** The Gorn.
* ResetButton: Averted for the most part. With no starbases or industrial replicators, any damage ''Enterprise'' sustains carries to the next episode. This is especially prevalent in "Dead Stop," which resolves the damage sustained in "Minefield," and the post-"Azati Prime" episodes of Season 3, in which ''Enterprise'' is blasted within an inch of its life by the Xindi and is barely held together for the rest of the season.
** Played straight in S3's "Twilight," but it doesn't take away from the episode the way it often did in Voyager.
* {{Retool}}ed twice in response to bottomed-out ratings -- the first occurred in Season 3 and abandoned the Plot of the Week for a DarkerAndEdgier season-long "epic" story arc. When that failed, the show was retooled for Season 4 by bringing in new creative staff and focusing the season on two or three-episode long mini-arcs. Although the quality of the show improved significantly (Season 4 is usually considered the best of the show), it was too little too late and said season proved to be its last.
* RunningGag:
** "Earth? Never heard of it."
** No mater how much he begs for it, do not feed cheese to Porthos.
%%* SapientCetaceans: The Xindi Aquatics.
* ScaryDogmaticAliens: Suliban (terrorists), the aliens in "Chosen Realm" (religious extremists), and the fractious Xindi standing in for the Middle East.
* SciFiWritersHaveNoSenseOfScale: In "Terra Nova", we're told that the original 200 or so colonists objected to Earth sending another 200 people to settle on their world. While it's understandable why they might have felt they couldn't fit more people in the ''Conestoga'' colony, they apparently failed to realise they had an entire ''planet'' at their disposal!
* ScrewTheRulesIMakeThem: The First Monarch, in ''Precious Cargo'', expresses this attitude towards the end regarding future visits from Enterprise's crew.
* SealedEvilInACan: "Regeneration", "Cold Station 12"
* SerkisFolk: Xindi Insectoids and Aquatics. Also ''Series/StarTrekTheOriginalSeries'' aliens the Gorn and Tholians are re-done as these in "In A Mirror, Darkly."
* ShirtlessScene:
** Archer and Tucker in "Desert Crossing." The writers presumably thought "It's a desert world; it'll be hot." Obviously nobody gets sunstroke or sunburn in the future, and in the present, nobody considers what desert-dwellers wear on Earth.
** The decontamination room. While it does make sense for it to exist in the capacity that it does, ''Star Trek'' is not above ignoring realistic things for expediencies sake. [[{{Fanservice}} Unless it involves half-naked characters rubbing each other]].
* ShootTheDog: An ongoing trope of the Season 3 Xindi War, notably in "Anomaly", "The Shipment", "Azati Prime", and "Damage."
* ShootTheHostage: A {{Mook}} has a revolver to T'Pol's head. Reed stuns T'Pol with his phase pistol and the Mook is left staring at Reed with a stunned expression. [[SugarWiki/MomentOfAwesome Reed shrugs and then stuns the Mook]].
* ShoutOut:
** [[Film/StarTrekFirstContact "We might as well be firing holographic bullets"]], among many others.
** Malik crawling across the bridge in "The Augments" should remind you of the death of another Augment.
** Detained features a shout-out to Series/QuantumLeap. The episode is notable for reuniting Scott Bakula and Dean Stockwell on screen for the first time since Quantum Leap ended. While they don't exactly quote Quantum Leap characters, and the relationship of the characters in this is antagonistic, the conversational tones do resemble a few conversations Al and Sam had.
** The video of the Vulcan crew of the ''Seleya'' losing their minds and murdering each other is clearly a reference to ''Film/EventHorizon''.
* SlapSlapKiss: Trip and [[spoiler: the First Monarch, in ''Precious Cargo''.]]
* SoundtrackDissonance: The new, [[RearrangeTheSong more upbeat]], version of the OpeningTheme coincided with the show's turn into DarkerAndEdgier territory in Season 3 as part of a general {{Retool}}. This was more often than not quite jarring when the teaser ended on an OhCrap moment only to segue into a bouncy pop song.
* SpaceDoesNotWorkThatWay: SpaceIsAnOcean, SpaceIsNoisy, TwoDSpace [[note]] though this was actually [[AvertedTrope averted]] in "Acquisition" [[/note]], InSpaceEveryoneCanSeeYourFace, and every other standard ''Franchise/StarTrek'' misrepresentation.
* SpaceMarine: The M.A.C.O. unit assigned to the ship in the third season. They wear dark uniforms, have a decidedly more military structure, are much more formal, and are there more or less explicitly to kick Xindi ass.
* SpaceMines: In the episode, "Minefield", the ''Enterprise'' runs into a cloaked field of Romulan mines.
* SpacePirates: "Fortunate Son", "Acquisition", "The Catwalk", "Anomaly." The Klingons have a habit of plundering undefended colonies ("Marauders", "Sleeping Dogs", "Judgement"), and even Archer has to resort to these tactics during the Xindi War ("Damage").
* SpaceSuitsAreScubaGear: T'Pol wears a space suit with a gratuitous external air hose in "Damage."
%%* SpaceWestern: "North Star"
* SpecialEditionTitle: "In A Mirror, Darkly." Even the ''song'' changed. Many people prefer that episode's opening credits to the usual ones and ads used the titles.
* SpinoffSendoff: This series is the only one not to be sent off by the previous series, but rather by one of TNG's movies, ''[[Film/StarTrekFirstContact First Contact]]'', with a recorded message from Zefram Cochrane.
* StableTimeLoop: [[spoiler:"Regeneration" reveals ''Film/StarTrekFirstContact'' was one. Basically, the Borg attacked earth, going back in time, where several were shot down. Then, they wake up, and send the location of Earth to the Borg. It was estimated to take 200 years to reach them. 200 years later, basically, the Borg attacked Earth, going back in time...]]
* TheStarscream: Pretty much ''everyone'' from the MirrorUniverse in "In A Mirror, Darkly", but especially [[TheNeidermeyer Mirror Archer]] and [[TheBaroness Mirror Hoshi]].
* StrawHypocrite: John Frederick Paxton, the leader of Terra Prime. He at least has the decency to admit to it when called on the fact.
* StupidJetpackHitler: "Zero Hour", "Storm Front" (Stukas with [[FrickinLaserBeams Frickin' Plasma Cannons!]])
* SubspaceAnsible: Despite the fact that later ''Enterprises'' would take hours or days to receive a pre-recorded subspace message, communications with the NX-01 are all real-time. But they're not as far out, and we do see relay beacons being deployed at one stage.
* SuperDickery: Archer and Hoshi start off "Babel" in a big argument that culminates in him suggesting she might want to leave in a shuttle pod if she's so dissatisfied with the state of things on Enterprise, and oh-by-the-way she's looking a little bit heavy lately. [[spoiler: Then she grins and says "that was a nice touch." Turns out they were practicing proper etiquette for dealing with a Tellarite ambassador. Tellarites apparently love to argue over everything.]]
* SurprisinglyHappyEnding: The three-part "Augments" episode ends on an unusually positive note. [[spoiler:Although the Augments are defeated, Arik Soong (grandfather of Dr. Noonian Soong) is simply incarcerated. But while in prison, he changes his research interests to artificial intelligence. He also remarks that the fruits of his research may take a generation or two. That research, whatever it is, is implied to lead to the 24th century's Soong creating the android Data. This is significant as the episode made no indication that he had fathered any children previously. So it is possible that sometime before his death, he will be released from prison.]]

[[folder:Tropes T-Z]]
* TeamSwitzerland: Starting with Archer's position in the Vulcan-Andorian conflict, in which he proves willing to look at the Andorians' side (albeit in part because of his own FantasticRacism) and gets the respect of one of their captains in doing so. Season 4 solidly establishes this as reason Earth became the center of a Federation in which they aren't the most strong, technologically advanced, expansionist, or logical species: they're the only ones all of those species are willing to trust because they all have long grudges against each other, which puts humans in the position of mediators and people willing to look for an explanation beyond "they did it because we'd like to have another go at them."
* TechnicallyLivingZombie: The Vulcan crew in "Impulse." Long-term exposure to trellium-D has not only stripped them of emotional control, it's turned them into mindlessly violent shamblers.
* TeleporterAccident: But no {{Holodeck Malfunction}}s as they hadn't been invented yet. Unless you count [[MisterSeahorse Trip getting pregnant]]. The teleporter has only recently been approved for non-cargo use and hardly anyone trusts it--which turns out to be a reasonable fear when they beam up a guy and he ends up with [[BodyHorror rocks and leaves sticking out of his skin]] because he'd been lying on the ground.
%%* TeleportersAndTransporters: "Vanishing Point", "Daedalus"
%%* TimeTravel: "Cold Front", "Future Tense", [[ForWantOfANail "Shockwave"]], "Carpenter Street", [[GodwinsLawOfTimeTravel "Storm Front"]].
* TimeyWimeyBall: Much of the Temporal Cold War arc, brought to a conclusion in the beginning of the fourth season and even the characters who knew what was going on couldn't explain exactly what was happening.
* TonightSomeoneDies: Actually used in-universe in "Observer Effect", where two crew members are possessed by non-corporeal life forms observing how Enterprise is going to react to a lethal infection on board their ship. As they discuss it, one of them remarks that they've been watching people get infected on this planet for centuries, and someone ''always'' dies.
* TooGoodToBeTrue: In "Dead Stop" T'Pol notices Captain Archer is visibly troubled about the mysterious repair station they've found which is able and willing to fix every bit of the extensive damage to their ship (and the injuries to its crew) in exchange for the amazingly low price of just 200 liters of warp plasma. His instincts are sound, as it turns out there's a "hidden fee" the station also tries to extract from them.
* TookALevelInBadass: In Seasons 3 and 4, Archer's fighting prowess considerably improved to the point where he could hold his own against anything up to a Xindi-Reptilian.
* TrailersAlwaysSpoil: A frequent complaint of fans was that the promos for upcoming episodes often spoiled key plot details, in at least one case even spoiling an ending. Additionally, going to break within episodes themselves, UPN would air previews that gave away plot details coming later in the episode.
* TrainingThePeacefulVillagers / TheMagnificentSevenSamurai: "Marauders"
* TranslationConvention (unless [[CunningLinguist Hoshi's translating abilities]] are crucial to the plot). Also ExpospeakGag, MyHovercraftIsFullOfEels, EitherWorldDominationOrSomethingAboutBananas, PardonMyKlingon, and CurseOfBabel (any episode where Hoshi can't translate).
* TwoGirlsToATeam: T'Pol and Hoshi, the experienced and emotionless Vulcan officer and (initially) nervous rookie communications specialist. Interestingly, as T'Pol learns to embrace her emotions more as she spends more time around humans, Hoshi becomes much more adept at dealing with her own fears and doubts as the mission progresses.
* {{Understatement}}: When Rajiin asks Archer why he's looking for the Xindi, who have already attacked Earth with a WMD and are believed to be building something roughly analogous to a Death Star for their second attack, he says he wants to "resolve a disagreement."
* UniversalTranslator: Averted, in that it is a recent development in this series and needs to be backed up by {{omniglot}} Hoshi Sato.
* VerbalTic: Phlox tends to--hmm?--speak with one.
* VillainBall: Malik in the Augments story arc. Besides his overall BondVillainStupidity, he is willing to risk the embryos that they had risked everything to obtain by attacking a Klingon outpost and blaming it on Earth (and yes, this action ends up getting all of the augments killed).
* VillainEpisode: The two-parter "In A Mirror Darkly", which focuses entirely on the MirrorUniverse characters. Complete with a more militant TitleSequence.
* VillainousBreakdown: In "Kir'Shara," V'Las loses control of his emotions and starts shouting as his plans fall to pieces, noticeably contrasted with T'Pau's calm.
* VirtualRealityInterrogation: In the episode "Stratagem". Captain Archer tries to get information out of an alien by convincing him that they are now friends and that years have gone by. The alien ship they have supposedly stolen is [[FauxtasticVoyage actually set up inside a small shuttle in the ''Enterprise'' landing bay]]. The small touches making the simulation seem real include tattooing both their arms with prison barcodes.
* TheWarOnTerror: Allegoried in "Detained", "Desert Crossing", the Xindi War and the fourth season Vulcan mini-arc.
* WellIntentionedExtremist: Arik Soong, who sincerely believes that Augments are the future of humanity and in the right hands, genetic engineering could be used to ''save'' countless lives. Despite his actions leading to a number of deaths, he tries to prevent causing casualties and is [[EveryoneHasStandards genuinely horrified]] when Dr Lucas' refusal to give up the codes consigns a fellow colleague to death.
* WeWillNotHavePocketsInTheFuture: Averted thanks to the {{zipperiffic}} uniforms worn by Archer & Co.
%%* WeWillUseManualLaborInTheFuture: "The Xindi", "North Star."
* WhatHappenedToTheMouse:
** In "Shockwave", Daniels explicitly states that history ''[[MakeWrongWhatOnceWentRight never]]'' recorded the disaster that lead to 3600 Paraagan colonists being incinerated when their atmosphere ignited? After wrestling with [[HeroicBSOD the guilt]] for the entirety of Part I, they end Part II relieved that they aren't the cause and that the Suliban are to blame and become re-focused on finding them to bring to justice. Although understandable that they are relieved that they aren't the cause of the colony extinction, after grieving the deaths in the first half they just become determined to find who is to blame and no one mourns the fact that 3600 people are ''still'' dead, mentions the impact of their death or what will happen to the timeline and history now that an entire colony of people are wipe out. They also don't bring up the idea of going back in time to prevent it... or were they expecting Daniels to change history back later?!
** What happened to the Automated Repair Station in "Dead Stop", which was shown [[BackFromTheDead rebuilding itself]] at the end of the episode?
** On a franchise-wide level, what happened to [[RememberTheNewGuy the Xindi]], the Denobulans and the Suliban in the next three hundred years?
** What happened to the Illyrians from whom Archer stole a warp coil in "Damage"? Without the coil, they were left 3 years from home. While it might undermine the moral dilemma of "Damage" slightly, it seems unforgivable that Archer wouldn't ask the Xindi to help the Illyrians once he got on better terms with them.
* WithFriendsLikeThese: In "The Andorian Incident", while the Vulcans clearly were wrong and spying on their adversaries, Archer intentionally reveals their spy array to the Andorians, which possibly gives them reason to start an ''[[NiceJobBreakingItHero interstellar war]]''. Archer seems to forget that, while he personally doesn't care for them, the Vulcans are Earth's closest ''allies'' and the Andorians have honestly done nothing to dispel the image that they're the aggressors in this conflict, since they've been figuratively beating the crap out of Archer since the moment they've met him. Why is interstellar policy being determined by a man, who honestly is most likely suffering a ''concussion'' at this point?
%%* WorstAid
* WouldBeRudeToSayGenocide: "Dear Doctor" being the standard bearer here. Between them, Phlox and Archer come to the conclusion that GoalOrientedEvolution has already condemned the Valakians to extinction and that giving them the cure for their genetic problem, which they have on hand, would constitute "playing God". Although it could be argued that they were doing exactly that by being so presumptuous as to decide that their hypothesis about the evolutionary direction of the Valakians and the Menk was predestined and not just speculation on Phlox's part.
* WouldHitAGirl: Archer doesn't have any problems with brawling with a female Andorian commando in "Cease Fire", especially when she hit first.
* YouAreNotReady:
** Archer holds a grudge against the Vulcans for withholding information on warp technology, so his father (an FTL engineer) never got to see his work in practice. Even though Archer learns that it's all a bit more complicated than that, resentment on this issue is maintained by other humans (one Terra Prime operative mentions the Vulcans' failure to stop WorldWarIII as the reason he joined the xenophobic organization).
** In the episode "Dear Doctor" a pre-warp civilization is trying to (very slowly) scout out other civilizations that might have access to technology that could cure their race of impending extinction. Archer takes one look at the guys and realizes, much to his chagrin, that they simply don't have the technological infrastructure to build warp engines, so just handing them the schematics would be worthless. Archer has just become everything he hated about the Vulcans.
* YouCalledMeXItMustBeSerious: When T'Pol addresses Commander Tucker as "Trip" in "Countdown", he takes notice!
%%* YouCantGoHomeAgain: "Horizon", "Home"
* YouKeepUsingThatWord: T'Pol invokes "logic" whenever dealing with the subject of TimeTravel. T'Pol has met time traveller Daniels, seen his advanced technology and even once parsed through a futuristic archive which included a complete history of Vulcan ships that ''haven't been built yet''. She has encountered a pod that is BiggerOnTheInside that contained a dead human corpse that had ''Vulcan'' DNA, something that is currently impossible by today's science. When the evidence is repeatedly standing right in front of her, concluding that time travel is possible would be called a ''logical'' conclusion.
* YoureInsane: Archer to the terrorist leader in "Chosen Realm": "You're out of your mind!"
* YouWontFeelAThing: In the episode "Similitude":
-->'''Captain Archer''': Dr. Phlox is going to have to perform an operation.
-->'''Sim Trip at 8''': Will it hurt?
-->'''Dr. Phlox''': Not at all. You won't feel a thing.
-->'''Sim Trip at 8''': Doctors always say that.
* ZeeRust: The NX-01 actually seems more futuristic than the original series USS ''Enterprise'' (NCC-1701). Worth noting that the set designer openly admits that fact is true, simply because real-world technology has advanced past [=TOS=] in places, and that he tried to keep it a balance of [=TOS=] and real-world modern.