[[quoteright:358:http://static.tvtropes.org/pmwiki/pub/images/OUTER_LIMITS_11.jpg]]
->''"There is nothing wrong with your television set. [[DoNotAdjustYourSet Do not attempt to adjust the picture]]. We are controlling transmission. We will control the horizontal, we will control the vertical..."''
-->--'''[[OpeningNarration The Control Voice]]'''

A ScienceFiction [[GenreAnthology anthology]] show, created by Leslie Stevens, although producer Joseph Stefano did more to set the series' avant garde tone. Its original version, which aired on Creator/{{ABC}} between September 1963 and January 1965, was often a worthy competitor to ''Series/TheTwilightZone''.

''The Outer Limits'' was often somewhat dark in tone, and it was also unusually arty and thought-provoking for an early 60s TV series, complete with poetic dialogue, unusual camera angles, a lush orchestral soundtrack by Dominic Frontiere, and {{chiaroscuro}} cinematography (often provided by future Oscar winner Conrad Hall). The show featured some truly brilliant writing by the likes of Stefano, Robert Towne, Anthony Lawrence and Meyer Dolinsky. And then there was the show's main selling point--the [[MonsterOfTheWeek Monsters Of The Week]] and other special effects, which were all the more impressive for being created on a weekly TV schedule and budget.

Although ABC commissioned ''The Outer Limits'' to cash in on the late 50s/early 60s monster boom, the network never really understood it. When ABC announced that during the series' second season in 1964, it would be [[ScrewedByTheNetwork moved to a suicidal Saturday night time slot]] against ''TheJackieGleasonShow'', Stevens, Stefano and much of their production team left in protest. The network replaced them with a new team headed by ''Franchise/PerryMason'' vet Ben Brady, who tried to save the series by making it (somewhat) less artsy and more commercial. ABC didn't help matters by reducing the series' already low production budget. Despite this, the second season produced several memorable episodes (most notably Creator/HarlanEllison's two scripts, "Soldier" and "Demon With A Glass Hand", and the two-part "The Inheritors"), but it did no good. After a few months of predictably bad ratings, ABC canceled ''The Outer Limits'' in the middle of the season, after only 49 episodes.

However, that wasn't quite the end. Despite its status as a short-lived, black and white anthology series, ''The Outer Limits'' remained popular enough to stay in constant syndication for nearly four decades. This resulted in a made-for-cable [[{{Revival}} revival]] series helmed by producer Pen Densham, which far outlasted the original, beginning its seven-season run in 1995. A few of the new series' episodes were {{remake}}s of episodes from the original series.

A [[Recap/TheOuterLimits recap page]] is in progress.
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!!Tropes featured:

* ''Literature/AdamLink'': The story was adapted by ''both'' versions of the show, under the title "I, Robot". Creator/LeonardNimoy appeared in both, as different characters.
* AddedAlliterativeAppeal: Joseph Stefano loved this trope. His scripts are full of phrases such as "this virile, violent inevitability" ("The Invisibles") and "mad mechanical magics" ("Fun and Games").
* AdultFear: "Under The Bed" has a monster that kidnaps and kills children
* AnAesop
* AfterTheEnd: "The Man Who Was Never Born."
* AlienInvasion: Several episodes of both series.
* AliensSpeakingEnglish: A frequent trope in both series, understandably enough. Given a variety of {{handwave}}s, some of which are more plausible than others. "The Zanti Misfits" is the only episode where the aliens don't speak English.
* AllThereInTheScript: The name of Aabel, the alien from "The Children of Spider County". His name is never shown or spoken in the episode.
* TheAmericanCivilWar: The setting of most of the {{Revival}} episode "Gettysburg" (better known as The One With Music/MeatLoaf), complete with one of the characters plotting to assassinate UsefulNotes/AbrahamLincoln.
* AndIMustScream:
** The fate of the Limbo Being in "The Premonition", who gets trapped in a VoidBetweenTheWorlds.
** Also happens with the murderous priest in the {{Revival}} episode "Fear Itself", driven mad in the end, a throwback to the punishment given to the SS commander in the ''TwilightZone'' episode "Death's Head Revisited" by the ghosts of his victims. LaserGuidedKarma, anyone?
* AnotherDimension: Two TOS episodes ("Production and Decay of Strange Particles" and "Behold, Eck!") feature beings from other dimensions accidentally finding their way into our world.
* ArcWelding: The season finales of the {{Revival}} are {{Clip Show}}s that tie together the plots of various previously unconnected stories, one involving a SuperSoldier project & another with a pair of immortal EnergyBeings who have been [[ChessMaster setting up the events of several stories]], all for no other purpose than their own amusement.
* BackToFront: "Zig Zag."
* TheBadGuyWins: Frequently invoked in the 90s revival.
* BattleBoomerang: Used by one of the Calco Galaxy aliens in "Fun and Games".
* BecomingTheMask: "The Chameleon" features a human spy who is turned into an alien to infiltrate a crashed spaceship. He adapts well to his transformation.[[spoiler:..so well that he abandons his empty life and goes into space to live on the aliens' world.]]
* BeepingComputers: Commonplace in the original series.
* BillingDisplacement: When the series was released on VHS, the tape packages sometimes gave top billing to well-known actors who played supporting characters (such as Creator/EdwardAsner in "It Crawled Out of the Woodwork" and ''Series/HappyDays''' Marion Ross in "The Special One").
* BigBrotherIsWatching: "O.B.I.T."
* BigNo:
** Delivered by Creator/MarkHamill himself at the end of "Mind Over Matter".
** Robert Patrick delivers one at the end of "Quality of Mercy".
** The two evil aliens deliver this as they are defeated at the end of "Better Luck Next Time".
** TOS example: One of the aliens in "The Chameleon" does this when [[spoiler:the human spy kills the other alien]].
* BittersweetEnding: The most common type of ending in the Revival, behind outright {{Downer Ending}}s. The original series did it fairly often as well.
* BodySwap: The TOS episode "The Human Factor" features an accidental one caused by a PhlebotinumBreakdown.
* [[BornInTheTheater Born on Pay Television]]: The revival's introduction, similar to the original's, has a "please stand by" notice added to it in syndication since the Showtime airings did not have commercials.
* BottleEpisode: "Controlled Experiment", "The Probe".
* BrainInAJar: "The Brain of Colonel Barham".
* BuildingOfAdventure: Most of "Demon with a Glass Hand" was filmed inside [[http://en.wikipedia.org/wiki/Bradbury_Building The Bradbury Building]], a UsefulNotes/LosAngeles landmark dating from 1893. Creator/HarlanEllison tailored his script around the location.
* ByTheEyesOfTheBlind: "Behold, Eck!", "Music of the Spheres".
* CatchPhrase: Quoted above.
* TheChainsOfCommanding: The episode "Trial By Fire" deals with the US President being sequestered in a bunker after being informed that a massive object, traveling at half the speed of light, is going to hit Earth in roughly a half hour. It's up to him to decide what to do from there, though he has plenty of noise from his advisers.
* CliffordSimak: His short story "Goodnight, Mr. James" was adapted for the original series as "The Duplicate Man".
* ClipShow: The {{revival}} had no less than seven: one each in Seasons 1, 3, 4, 5 and 6 and two in Season 7 (those being the last two episodes...)
* CloningBlues: "The Duplicate Man" in TOS. The {{revival}} has "Think Like A Dinosaur" and, unusually, subverts the trope with "Replica", which also has one of the few {{happy ending}}s in the new series.
* ColorMeBlack: "Tribunal" featured an ending where a Nazi war criminal whose escaped justice for 50 years put into the uniform of his prisoners and taken back in time to his own camp. His younger self shoots him for being Jewish.
* CompellingVoice: "The Special One", "The Inheritors".
* ConspicuousGloves: In "Demon with a Glass Hand", Trent (the man with the glass hand) wears a glove over it, only removing it to speak to it or add a finger as he finds them.
* CourtroomEpisode: "O.B.I.T.", "I, Robot".
* CrapsackWorld: In [[TheRemake the remake series]], at least. Many episodes are interconnected through the mysterious [[EvilInc Innobotics Corporation]] and their RidiculouslyHumanRobots, not to mention that every season produces a couple of sequel episodes for earlier stories for double the CruelTwistEnding!
* CreepyMonotone: The Control Voice.
* CruelTwistEnding: The {{revival}} series did this so often, the trope used to be named Outer Limits Twist.
* CrypticBackgroundReference: In Joseph Stefano's scripts, characters sometimes make fleeting references to their pasts that are never explained.
* DarkIsNotEvil: [[spoiler:The Ebonites in the TOS version of "Nightmare".]]
* DarkerAndEdgier: Than most shows at the time.
* DeathIsTheOnlyOption: In the episode "Better Luck Next Time", a police detective is manipulated by a pair of malevolent energy beings into being their plaything, intending to turn her into a host after they've tricked her into shooting a fellow cop. However, their hosts burn out rapidly, they can't survive for long without one, and their current hosts are just about to expire. She [[TitleDrop utters the episode's title]] just before shooting herself in the head, bringing the energy beings' centuries-long murder spree to an end.
* DecoyProtagonist: Joseph Reardon in "The Man Who Was Never Born." He's primarily focused on for the first ten minutes, then after he gets [[RetGone Ret Goned]] Andro (played by Martin Landau) serves as the true protagonist of the episode.
* {{Deprogram}}ming: "The Deprogrammers".
* DisabilityImmunity: One episode of the Revival had a mentally handicapped man with fetal alcohol syndrome who was immune to an infestation of mind-controlling brain worms because his brain was so feeble they simply starved to death.
* DoesNotWearShoes: The perpetually barefoot Mrs. Dame in the TOS episode "The Bellero Shield". The episode has several lengthy closeups of her bare feet.
** FeetFirstIntroduction: How we first see her.
*** Some of the TOS aliens went barefoot as well ("O.B.I.T.", "The Children of Spider County", "The Chameleon").
* DownerEnding: Both series, although the [[{{Revival}} revival]] did it more often; the original series was more likely to do {{Bittersweet Ending}}s.
* DramatisPersonae: "Counterweight" does this at the ''end'' of the episode.
* DramaticThunder: Used [[{{irony}} ironically]] in "Specimen: Unknown".
* DrivenToSuicide: At the climax of "The Man with the Power", [[spoiler:Harold Finley, who has gained deadly new mental powers that [[PowerIncontinence he can't consciously control]], declares that "If I have this power, then I don't want to live" and turns it on himself]].
* EarnYourHappyEnding: A few episodes, even in the revival.
* EasilyThwartedAlienInvasion
* EnergyBeings: Featured in the TOS episodes "It Crawled Out of the Woodwork" and "Counterweight", plus several revival episodes.
* EpisodeTitleCard: Very distinctive on the original series; the episode title, and the names of the episode's stars, come right at the viewer, accompanied by the sine wave and (after the first few episodes) the piercing electronic whine from the TitleSequence.
* EverythingsWorseWithBees: "ZZZZZ".
* EvilTeacher: Mr. Zeno in "The Special One".
* FakeDefector: Kenny Benjamin in "The Special One". He was only pretending to cooperate with Mr. Zeno, and he saves the day by turning the alien's own weapon against him.
* {{Fanservice}}: The revival had a lot of scantily clad and naked women (notably Alyssa Milano in "Caught In The Act").
* FantasticAnthropologist
* FirstContact: One of the series' central tropes.
* FishOutOfTemporalWater: The main characters of the TimeTravel episodes listed below.
* FreeSamplePlotCoupon: In the TOS episode ''Demon with a Glass Hand", the character Trent must find the three missing fingers of his artificial left hand to save humanity from the Kyben invasion. Fortunately Trent's incomplete left hand is a talking computer that can help him find the three fingers.
* FrogsAndToads: They're possessed by a disembodied alien in "Cry of Silence".
* GenghisGambit: The plot of "The Architects of Fear".
* GenreAnthology
* GetAholdOfYourselfMan: When test pilot Jim Darcy and his wife Linda are trapped in a TimeStandsStill situation during "The Premonition", she [[FreakOut freaks out]] and he calms her down with a slap to the face.
* GladiatorGames: The plot of "Fun and Games"; the Anderans kidnap beings from various planets to fight for survival, with the losers' homeworld being destroyed.
* AGodAmI: "The Sixth Finger", pictured above, and "The Brain of Colonel Barham".
* GovernmentDrugEnforcement: Several episodes.
* GovernmentAgencyOfFiction: In "The Invisibles", the protagonist is a spy who works for the '''G'''IA [[{{CIA}} (General Intelligence Agency)]].
* TheGrotesque: Andro in "The Man Who Was Never Born", the fake alien in "The Architects of Fear", the Chromoite alien in "The Mice", etc.
* HalfHumanHybrid: Regina in "ZZZZZ" and the titular characters in "The Children of Spider County".
* HeWhoFightsMonsters: The robot at the end of "The Hunt".
* HeroicSacrifice: Several episodes of both series.
* HoistByHerOwnPetard: The fate of scheming, murderous Judith Bellero in "The Bellero Shield".
* HoistByHisOwnPetard: The fate of scheming, murderous Mr. Zeno in "The Special One".
* HostileTerraforming: One episode of the revival had this with a new model of car that would poison the atmosphere for infiltrated aliens.
* HumansAreBastards: Both versions of the series explored humanity at its worst, though they were also kind enough to show humanity at its best, usually at the same time.
* HumansAreCthulhu
* HumansThroughAlienEyes: "Controlled Experiment".
* HumanitysWake
* HumanMomNonhumanDad: The title characters in "The Children of Spider County".
* HuntingTheMostDangerousGame: "The Hunt".
* IdiotBall: Over the duration of "Sandkings", the main character (Simon) grabs onto the ball so tightly that he practically becomes a walking-talking IdiotBall himself. To elaborate: he brings home [[spoiler:Martian insects proven to be intelligent enough to escape military security procedures. He continually expands their enclosure, maxing out his family's credit line in the process. He leaves the enclosure open-air, allowing the family dog to be [[KickTheDog kicked]]. After punishing the creatures for doing so, he leaves his upper body dangling inside the enclosure, getting himself bit. Then he invites his ex-boss over to feed the creatures, and his death spasms break open the enclosure.]]
* ImMrFuturePopCultureReference: In the episode "Time to Time", a time traveler uses "Luke Skywalker" as an alias when in the year 1969. He even finished a phone call with "May the Force be with you."
* INeverToldYouMyName: As part of the DownerEnding of the revival's "Lithia." [[spoiler: Set in the post-apocalyptic commune of the title - entirely populated by females due to a plague having killed all but a few cryogenically frozen men - a defrosted male is put back into freeze after his aggressive tendencies cause tragedy, and the leader of the commune (who says "Goodbye, Jason" as he's frozen, even though he never... you know) is his lost love.]]
* IncrediblyLamePun: Music/MeatLoaf plays a character named Col. Angus in "Gettysburg".
* InsectQueen: Classic episode "ZZZZZ". A giant mutant queen bee takes human form so she can mate with a human male. She can control her fellow bees and make them attack people, such as the wife of the man she wants to seduce.
* InYourNatureToDestroyYourselves: Referenced in the TOS episode "Counterweight" and the revival episode "Heart's Desire".
* JacobMarleyWarning: The Limbo Being gives one of these to the main characters of "The Premonition"--mostly because they threaten to ''[[ValuesDissonance set him on fire forever]]'' if he doesn't tell them how to escape from their TimeStandsStill situation, as he was unable to do.
* JekyllAndHyde: "Expanding Human".
* {{Jerkass}}: The bad-tempered, self-pitying title character in "The Brain of Colonel Barham". Yes, he's terminally ill, but the episode makes it clear that he was a jerk even when he was healthy.
* JustAMachine
* KillAndReplace: A U.S. Presidential candidate by an Asian government's agent, in the 1960's episode "The Hundred Days of the Dragon".
* LighterAndSofter: The second season, while not lighthearted, generally lacked the darkness and moral ambiguity found in many season one episodes, and took far fewer risks.
* LivingGasbag: The revival series episode "Tempests" has kilometer-long jellyfish blobs that float through the clouds of the planet Leviathan.
* LotusEaterMachine: "Tempests".
* MandatoryTwistEnding: What are these [[HappyEnding "happy endings"]] of which you speak?
** To be fair, both versions of the show do have the occasional episode with a {{happy ending}}.
* MechanisticAlienCulture: Many episodes of the classic sci-fi anthology featured aliens with ambiguously robotic characteristics.
* MildlyMilitary: TOS episode "The Invisible Enemy". The officers in the second mission repeatedly disobey orders and get each other killed.
* MindControl: "The Brain of Colonel Barham" (from the episode of the same name) somehow gains this power.
** Also, in "The Special One" Mr. Zeno can control the bodies of his victims, while their minds remain free. A nice power to have when you're an alien invader who sadistically delights in forcing the humans who discover your plot to commit suicide against their will...
* AMindIsATerribleThingToRead: "What Will The Neighbors Think?"
* MonsterOfTheWeek: One of the original series' central tropes; somewhat less common in the {{Revival}}.
* MultinationalTeam: The human soldiers in both versions of "Nightmare".
* MurderByCremation: One episode involves a scientist working in a sealed lab with a gas meant to be used to pacify riots. As a side effect, the latest batch ends up turning the lab monkey immortal. When the scientist's assistant attempts to steal the monkey's biological culture, the scientist's CorruptCorporateExecutive brother traps him in the lab. The angry assistant slams the door with his fist, which results in a bloody fist. The culture in his blood triggers the decontamination system, which "flashes" the lab, killing the guy. The brother later tries the same with the scientist and his girlfriend, who have discovered that [[spoiler:the culture makes you ''temporarily'' invincible, only to kill you in a few days]].
* MurderTheHypotenuse: In "ZZZZZ", humanoid queen bee Regina sics her hive on [[spoiler:the wife of the entomologist she's fallen in love with]].
* NamingYourColonyWorld: Dundee's Planet from "Wolf 359".
* NiceJobBreakingItHero: Occurs in more than a few episodes, but "Sandkings" is the story of one man breaking things over and over. See IdiotBall.
* NoImmortalInertia: "The Guests".
* NoOneLeftBehind: In TOS episode "The Invisible Enemy", Captain Buckley refuses to leave Major Merritt behind on Mars.
* NoPartyGiven: The Presidential candidates in "The Hundred Days of the Dragon".
* ObsoleteMentor
* OpeningNarration: Partially quoted above.
* OrificeInvasion: "From Within".
* OutlawCouple: Ben Garth and Lisa Lawrence in "The Zanti Misfits", although Ben fits the "outlaw" part much better than Lisa does.
* PistolWhipping: In "Demon With a Glass Hand", Trent knocks out one of the Kyben by hitting him on the head with the butt of his pistol.
* PlantAliens: The anenome-like Grippians from "Moonstone".
* PoorCommunicationKills:
** In his ''Outer Limits Companion'', David J. Schow identifies this as a plot flaw in two TOS episodes, "The Mice" and "Second Chance". He notes that both episodes feature "a lone alien on a mission that is terminated because the aliens do not bother to ask for what they want."
** This was featured in "Trial By Fire" (detailed under TheChainsOfCommanding, above). It would have been a far easier decision [[spoiler: if those on Earth knew what the aliens were saying with their transmission]].
* PoorlyDisguisedPilot: There were two versions of "The Forms of Things Unknown"; one was intended as a pilot for ''The Unknown'', a straight suspense anthology that wasn't picked up. The PointOfDivergence: In "Forms", the "[[TimeMachine Time Tilter]]" actually works, while in ''The Unknown'' it doesn't.
* PowerIncontinence: "The Man With the Power."
* PsychicStatic: Used by a man to protect his thoughts from the title character in the TOS episode "The Mutant".
* PsychicSurgery
* PuppeteerParasite: "Corpus Earthing", "The Invisibles".
* ReallyWasBornYesterday: In "Demon with a Glass Hand", Trent initially thinks he's "A full grown man, born ten days ago." [[spoiler:He's wrong on both counts.]]
* RecycledSoundtrack: Some of Dominic Frontiere's music came from ''Stoney Burke'', an earlier Leslie Stevens series. Later, some of his ''Outer Limits'' scores were used in ''Series/TheFugitive'' (especially the fourth season), ''Series/TheRatPatrol'' and ''Series/TheInvaders'' (including the theme music, which was originally composed for ''The Unknown'').
* ReluctantMonster: The titular alien in "Behold, Eck!" Also the episode's WorkingTitle.
* TheRemake: Five episodes of the original were redone as four episodes of the {{Revival}} ("Nightmare," "A Feasibility Study," "I, Robot" and "The Inheritors" parts 1 and 2 - this last, the original's only two-parter, was remade as a one-parter).
* ResistanceAsPlanned: Part of the twist ending of the episode "[[spoiler:The Deprogrammers]]."
* RobotGirl: One episode of the {{Revival}} involved a RobotGirl as one of the main characters, and it ended on an absolute TearJerker.
* RoboticReveal: The ending of [[spoiler:"Demon with a Glass Hand".]]
* RoboticSpouse: The premise of the Revival episode "Valerie 23" [[spoiler: and the mandatory CruelTwistEnding of its sequel, "Mary 25"]]
* SandIsWater: "The Invisible Enemy" had a sand ocean complete with tides and several giant monsters swimming in it.
* ScienceIsBad: A recurrent theme and the basis for the plots of many (though not all) of its episodes.
** Notably averted in the episode "Behold, Eck" where not only is the scientist character the hero, but his invention ultimately saves the day (and the alien, who just wanted to go home).
* SealedEvilInATeddyBear: One of the episodes in the Revival series had a literal example of this trope as part of the ColdOpening.
* ScreamingWoman: Quite a few examples, especially in the original series.
* ScrewedByTheNetwork
* SecretTest: In "Nightmare" a group of soldiers invading the planet Ebon are captured and tortured for information by the Ebonites. [[spoiler: They eventually learn that the situation is a set-up by their own superiors to test their ability to resist interrogation, with the cooperation of the Ebonites (who eventually protest the unethical nature of the test).]]
* SeekerWhiteBloodCells: In an episode of the new series, a spaceship crew punches a hole into another dimension, which they assume to be [[SubspaceOrHyperspace hyperspace or subspace]]. The main character, who is descended from {{Magical Native American}}s, starts to believe that it is actually the bloodstream of the living universe. What they originally thought to be asteroids turn out to have a similar structure to human white blood cells, except they use gravity to kill infection.
* SendInTheSearchTeam: The plot of "The Invisible Enemy". The protagonists are sent to Mars to learn why the astronauts from the first expedition disappeared.
* [[ShowAccuracyToyAccuracy Show Accuracy/Trading Card Accuracy]]: The original TOS ''Outer Limits'' [[http://science-fiction.netfirms.com/ cards]] (one of which is the page pic), released while the series was still in production, are notorious because the writer, who apparently had never watched the show, concocted new stories (and [[SoBadItsGood laughable]] ones, at that) around colorized photos of the AliensAndMonsters. Later series of cards didn't have this problem; one series recycled the original pics with new text including both the TV and trading card plots.
* SimilarlyNamedWorks: The {{revival}} episode "The Human Factor" is ''not'' a remake of the TOS episode with the same title.
* SlidingScaleOfContinuity: Level 0 (Non-Linear Installments).
* SlidingScaleOfIdealismVsCynicism: Tends to fall on the cynial side, but there are exceptions.
* SnarkToSnarkCombat: In the TOS version of "I, Robot", the exchanges between Thurman Cutler (Adam Link's attorney) and Judson Ellis (a cynical reporter covering the robot's murder trial) fall into this.
* SpoilerTitle: "The Probe", considering that the story is about a group of plane crash survivors who wind up on an alien space probe--without either the characters or the audience initially realizing it--and spend about half the episode trying to figure out where they are.
* StarCrossedLovers:
** Andro and Noelle in "The Man Who Was Never Born".
** Eric and Larissa in "Stasis".
* StockFootage: Used from time to time in the original series. Some spaceship shots come from earlier science fiction films and series. "The Premonition" starts with footage of an actual X-15 flight; it also includes scenes of a coyote chasing a rabbit through the desert and a hawk attacking its prey, which were taken from ''Series/MutualOfOmahasWildKingdom''.
* StopMotion: Used to animate the aliens in "The Zanti Misfits" and "Counterweight".
* TeleportersAndTransporters: "The Galaxy Being", "The Mice", "Fun and Games", "The Special One", "Think Like A Dinosaur".
* TelevisionPortal: "The Galaxy Being".
* {{Theremin}}: Harry Lubin's scores for the second season of the original series use the instrument extensively.
* TickertapeParade: "Cold Hands, Warm Heart" begins with one.
* TimeIsDangerous:
** In one {{revival}} episode, the result of RippleEffectProofMemory is that an entirely new lifetime's worth of memories gets added onto the existing one, which could result in brain damage.
** Also, the aforementioned AndIMustScream situation in "The Premonition".
* TimeStandsStill: "Controlled Experiment", "The Premonition".
* TimeTravel: "The Man Who Was Never Born", "Soldier", "Demon with a Glass Hand", several episodes of the {{Revival}}.
* TomatoInTheMirror: [[spoiler: "Demon with a Glass Hand"]]
* TomatoSurprise: "Tempests".
* TreacherousSpiritChase: The main plot of "If These Walls Could Talk" concerns a house "infected" by an alien substance. Not only does the house absorb people into its structure, it's able to regurgitate {{Doppelganger}}s of those people to lure in their friends and loved ones when they come searching for answers.
* TwentyMinutesIntoTheFuture: The setting of "Nightmare" [TOS version], "Specimen: Unknown", "Moonstone", "The Duplicate Man" and some episodes of the {{Revival}}.
* TwoRightsMakeAWrong: Several episodes have this as the twist.
* VichyEarth: "The Deprogrammers"
* VideoPhone: The episode "The Duplicate Man" had video phones with rotary dials.
* WaitHere: "Demon with a Glass Hand". Trent has Consuelo climb out onto a window ledge outside the building so she'll be safe from the Kyben.
* WakingUpAtTheMorgue: Happens to a college professor who's been experimenting with a mind-enhancing drug in the TOS episode "Expanding Human".
* WalkThroughTheCamera: Trent does this twice during "Demon with a Glass Hand". Wade Norton does it in "The Guests".
* WarriorPoet: Major Jong in the TOS version of "Nightmare".
* WhatNowEnding: "It Crawled Out of the Woodwork". [[spoiler:The deadly energy monster is confined again, but as a policeman notes, "It's under control--''for the moment''". No one knows how (or if) it can be destroyed, or how else to deal with it.]]
* WhatYouAreInTheDark: Quite a few moments. The closing narration for "The Voyage Home" even outright states "The true measure of a hero is when a man lays down his life with the knowledge that those he saves... will never know."
* WholePlotReference: "The Man Who Was Never Born" is based on ''Literature/BeautyAndTheBeast'', and "The Bellero Shield" is based on ''Theatre/{{Macbeth}}'' (which also makes it an example of TheBardOnBoard). Coincidentally, both episodes star Martin Landau.
* TheWildWest: The setting of the revival episode "Heart's Desire".
* XRaySparks: "The Borderland".
* YearInsideHourOutside: A plot element in "Don't Open Till Doomsday" and "The Guests" from TOS and "The Sentence" from the {{revival}}.
* YellowPeril: The Red Chinese are the villains in the TOS episode "The Hundred Days of the Dragon".
** Averted and [[{{LampshadeHanging}} lampshaded]] in the {{Revival}}. In the ClipShow episode "The Human Factor" about a future ColdWar between America and China, the latter complain that they are [[{{DesignatedVillain}} regarded as the bad guys]] even though the former are usually the ones to initiate hostilities. [[spoiler: This is borne out when the American leaders start WorldWarIII.]]
* YouLookFamiliar: Both series did this.
** The {{Revival}} had several episodes featuring the time-traveler Nicholas Prentice, played by Alex Diakun. Alex Diakun also played unrelated characters in unrelated stories, most confusingly the store owner in "Alien Shop", which aired after two Nicholas Prentice episodes had established character continuity.
** Creator/KimCoates played two different, unrelated characters, ''seven years'' apart.
** Crystal Cass appeared in "Paradise", "Bits of Love", and "Rite of Passage". Emmanuelle Vaugier appeared in "Rite of Passage" and "The Other Side". Kristen Lehman appeared in "Falling Star", "Dead Man's Switch", "Stasis", and "Time To Time". MichaelIronside appeared in "Summit" and "Rule of Law". Each time, these are different characters in unrelated stories.
*** The original series did this as well, most notably with Robert Culp, who starred in three episodes.
* YouWakeUpInARoom:
** Trent, in "Demon With a Glass Hand," who also has LaserGuidedAmnesia.
** In "The Duplicate Man", the clone of Henderson James has a similar awakening.
* {{Zeerust}}: "The Duplicate Man", a TOS episode from 1964, is set in 2025, a future in which humanity has been exploring outer space at least since the 1980s.
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