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[[quoteright:350:http://static.tvtropes.org/pmwiki/pub/images/space1999_1_9345.jpg]]
->''"We are Mankind. We came from planet Earth, and we built this base, called Alpha, to learn more about space. But human error blasted this Moon out of the Earth's orbit. And so, we have traveled the Universe searching for a place to live."''
-->-- Prof. Victor Bergman

This British TV series was created by Gerry and Sylvia Anderson, the creators of ''Series/{{Thunderbirds}}'' and other "{{Supermarionation}}" fare as well as ''Series/{{UFO}}'', and was produced by Lew Grade's ITC (in co-production with Italy's RAI during the first season, explaining the presence of Italian guest stars). It originally aired in the UK between 1975 and 1977, although several season one episodes were premiered in the US (like "Another Time, Another Place") and Australia (like "Ring Around The Moon").

It consisted of two seasons, each with a different approach; season one was slow-paced and cerebral, whereas season two had more "monster of the week" episodes. Its premise was simple: on September 13th 1999, a ridiculously small explosion blows the moon out of its orbit and accelerates it to a velocity sufficient to send it hurtling out of the solar system and travel interstellar distances in improbably short times.

During this catastrophic event the 300 persons crewing Moonbase Alpha avoid getting smeared into jelly; once things settle down a bit, they make the best of bad situation by surviving for at least three years with no means of support. They also deal with all the usual [[SciFi skiffy]] hackery -- AliensAndMonsters, mysterious events, the works -- without much thought to any serious science (or, often, common sense) in the resulting plots.

The massive production cost of the show meant that a network sale in the USA was more-or-less essential. Lew Grade, the head of ITC, pulled defeat from the jaws of victory by raising the asking price at the last minute in negotiations with a previously enthusiastic NBC, who called his bluff and passed. On learning of this, CBS and ABC also declined to buy it, and Grade was forced to sell it into syndication. Regardless, the ratings were successful enough that ITC commissioned a second season, with the provisos that there should be an American producer and the budget should be cut. The second season was also popular enough that a third almost happened.

A fan-produced featurette, "Message from Moonbase Alpha" (written by regular series writer Johnny Byrne, starring Zienia Merton as series regular Sandra Benes, using footage from the series and done with permission of the copyright holders, therefore ''almost'' being canonical) eventually established that the Moonbase crew found an Earth-like planet to live on.

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!!Tropes:

* AbsenteeActor: When producer Fred Freiberger came on board he set up a system where from time to time two episodes would be filmed simultaneously for scheduling purposes, specially scripted so that key regulars would have a minimal presence in one episode while taking centre stage in another. The most notable pairing was "Dorzak"/"Devil's Planet" - Martin Landau does not appear at all in the former, while he's the main character in the latter.
* TheAce:
** In "Dragon's Domain", Koenig says Tony Cellini used to be this, before the Ultra Probe mission messed him up.
** Tony Verdeschi comes across as this in Season Two.
* ActionGirl: Maya crosses into this occasionally, and not only when she shape-shifted, either.
* AdamAndEvePlot: What ends up happening to Luke and Anna on "The Testament Of Arkadia".
* AliensAndMonsters: And a wide variety of NegativeSpaceWedgie flavors to choose from as well. [[TheWorldIsAlwaysDoomed Poor Moonbase Alpha is Always Doomed]].
* AliensSpeakingEnglish:
** Some even write in English.
** A LOT of the aliens have hilariously odd names, especially for those who live in the UK. Psychons ("The Metamorph") get a pass due to the nature of the plot; however the villain of "The Infernal Machine" being named Gwent (for those who don't know, a council in Wales), the entire episode "The Rules of Luton" (Luton is a town just outside London), and "One Moment of Humanity", which feature1 aliens called the ''Vegans'' are noteworthy examples (though in the last case, Vega is the name of a real star, and authors like James Blish had used the name to refer to aliens from Vega's solar system ''long'' before the common word "vegan" came into use).
* AllGirlsWantBadBoys: Peter Bowles had some rather uncomfortable attention after his role in ''End of Eternity''.
--> "It ended up with a lady from America getting into my house, because she wanted to be my sex slave. She sold everything and had come over because she wanted to be dominated by the most evil man in the universe."
* AncientAstronauts: In "The Mark of Archanon", the aliens of the week are found buried on the moon itself, where they've been in stasis for centuries.
* AndIMustScream:
** The fate of Commissioner Simmonds in "Earthbound".
** Balor in "End of Eternity". Not only does he ''start'' the episode locked away for Eternity, but at the end he's blown into vacuum. Whether his HealingFactor will keep him between life and death for eternity is never addressed.
* ApocalypseDayPlanner: September 13th, 1999 is the date when the solar system is changed forever.
* AppliedPhlebotinum: The Gravity Shields, for one, became important on various episodes (like "Black Sun"), and both Bergman (and later Maya) and/or Russell came with ideas to use some new device each week (the first two a scientific procedure or gadget, the latter a ''medical'' procedure or gadget).
* ArbitrarySkepticism: After being out in space for so long and seeing all kinds of AliensAndMonsters, the Alphans still spend a good part of the first act of "The Troubled Spirit" finding it hard to believe that there is an honest-to-goodness ''ghost'' running around Alpha killing people, and that such thing as researching the psionic potential of humans is still done back on Earth. It is the fact that one of the Moonbase researcher's skepticism makes him interrupt a seance on the prologue [[NiceJobBreakingItHero that starts the whole mess]].
* ArtificialGravity: The moonbase is equipped with "gravity shields" that provide artificial gravity, let spacecraft take off and land on planets without refueling, and allow the moon to fly ''through'' a black hole. The shields stop working every time they would be detrimental to the plot.
* ArtisticLicensePhysics: This series is notorious for this.
** For instance, Creator/IsaacAsimov complained that an explosion powerful enough to deorbit the Moon would have destroyed it.
** Furthermore, the nuclear waste that exploded was located on the far side of the Moon, which meant that the moon would have been driven into Earth itself. This was ''somewhat'' handled in one episode novelization, which [[{{Retcon}} retconned]] Breakaway from being a [[EarthShatteringKaboom massive nuclear "kaboom"]] to a more rocket-like reaction.
** Also, the way the moon seems to encounter extra-solar planets every few weeks or so would not only have required it to move much faster than light, but on a trajectory with frequent course changes (star systems don't just line up like that) for which no explanation is given.
* BackdoorPilot: Interestingly enough, "Message From Moonbase Alpha" could be seen as one, with [[WordOfGod Johnny Byrne mentioning]] that he had a concept in hand for any potential investors about a continuation series focusing on the Alphans and their descendants, 25 years after Operation Exodus when the Moon came orbiting back towards their planet. [[AuthorExistenceFailure Sadly, Byrne passing away]] means that the idea's future is very much unknown.
* BigNo: Dionne has one in "The Last Enemy."
* BilledAboveTheTitle: Martin Landau and Barbara Bain.
* BridgeBunnies:
** Most of the female personnel on Alpha seem to be either this or nurses. The only female regulars shown to perform any work of consequence are Dr. Russell and Sandra Benes (and, in the second season, Maya), though Sandra is clearly working in a subordinate position -- and seems to have little to do other than scream, faint or both. She gets a little more to do in the second season, even as actress Zienia Merton is... eased out.
** Some individual episodes have e.g. female scientists or female aliens playing an important role, but these characters are not recurring parts.
* CaptainsLog:
** Dr Helena Russell, starting with season two.
** Also used in two first season stories, "Dragon's Domain" (with Dr. Russell) and "The Testament of Arcadia" (with Commander Koenig). Unfortunately, in the case of "Dragon's Domain" that means several season two episodes (such as "The Metamorph") take place in the timeframe of season ''one''...
* ChuckCunninghamSyndrome: Paul Morrow, David Kano, and Tanya Alexander disappeared between seasons with no on-screen explanation (though a tie-in annual feature stated that Morrow was killed in an Eagle crash). Professor Bergman also disappeared between seasons, but not without explanation; a (deleted) dialogue exchange in "The Metamorph" (the opening episode of Season Two) confirms that Bergman died previously due to a spacesuit malfunction.
* ComicBookAdaptation: Numerous.
** Charlton Comics published both a color comic and an adult-oriented black and white illustrated magazine (noted for copious MsFanservice moments). One episode of the black and white comic is dissected [[http://www.misterkitty.org/extras/stupidcovers/stupidcomics444.html here]].
** Power Records released several comic-and-record sets.
** There was also a popular comic strip in the UK.
** In the 2010s all of these were brought back in a remix/mashup form combined with new material for a series of graphic novels.
* CompilationMovie: This series was edited into five of these (including the show's only two-parter, "The Bringers Of Wonder," which became ''Destination Moonbase Alpha''). Some additional material was also filmed for the first movie, ''Alien Attack'' (which compiled "Breakaway" and "War Games"). One, ''Cosmic Princess'' (compiling "The Metamorph" and "Space Warp"-interestingly enough, the events of both episodes happen days to weeks apart in series canon and are not connected, but the compilation makes it look like they happen one immediately after the other), was featured in an early season of ''Series/MysteryScienceTheater3000''. [[CreatorBacklash Interestingly, some of the actors (amongst them Martin Landau and Barbara Bain) were not happy about this presentation format in the long run]].
* CoolOldGuy: Victor Bergman. OmnidisciplinaryScientist, TheProfessor, mentor figure for Koenig.
* CoolStarship:
** The Eagle Transports, possibly the most realistic fictional TV spacecraft ever created. Ersatz "Film/TwoThousandOneASpaceOdyssey" Moon Buses.
** And their military counterparts, the Mark IX Hawks from "War Games."
* CosmicHorrorStory: A great many of the threats that assailed Alpha are alien intelligences that care absolutely nothing about their plight and actually saw in ''them'' a solution to ''their'' problem (which would undoubtedly kill many if not all of the Alphans, and on a couple of occasions even ''Earth''). [[LovecraftLite The Alphans manage to beat them back, however]], even if sometimes it has a great price. And on the flip side, sometimes ''benevolent'' aliens appear (and Koenig and Bergman firmly believe that ''something'' has helped them survive as long as they did, with the odds stacked so unfairly against them).
* CustomUniformOfSexy: Averted. Despite Dr. Russell being the only female part of consequence, and Barbara Bain's obvious star status, she wears exactly the same uniform as everyone else (with the exception of not having a zipper down one sleeve -- but that was for the actress's comfort, and not for cosmetic purposes).
* DemotedToExtra:
** Sandra Benes seemed poised to suffer this fate as Season Two went on.
** Robert Mathias did.
* DistantFinale: The "Message from Moonbase Alpha" featurette.
* EverythingIsAnIpodInTheFuture: The interiors of Moonbase Alpha and the uniforms worn by the Alphans (especially the more unisex versions in season one).
* ExactWords: in the episode "Earthbound", hibernating aliens en-route to Earth have programmed their ship to make a pit stop on the Moon. After the Moon was blasted into deep space, the ship duly diverts to land on the Moon anyway, even though the Moon is by this time light years from Earth, [[NegativeSpaceWedgie and maybe in another part of the Universe entirely]].
* FailureIsTheOnlyOption: Any attempts by the Alphans to find a new place to live or to go back to Earth are constantly thwarted by an [[DiabolusExMachina uncaring]], [[CosmicHorrorStory overpowering]] universe.
* {{Fanservice}}:
** Averted with the unisex uniforms of the first season, which were deliberately designed to avoid sexualizing the women. This was in marked contrast to the precursor ''Series/{{UFO}}'' and most other SciFi shows of the times.
** Played straight in a few cases:
*** When the crew adopt, or are forced to adopt, native dress while visiting planets, those clothes sometimes are more a bit on the {{Stripperific}} side.
*** There are some cases of ClothingDamage which turn the uniforms into VaporWear.
*** In one episode, a crewmember is possessed by an alien that craves energy from the environment, which drives him to the base solarium to seek heat and light. This gives an opportunity for [[MaleGaze shots of bikini-clad women]].
* FixFic: The "Message from Moonbase Alpha" featurette.
* GlamourFailure: The episode "The Bringers of Wonder" had huge disgusting aliens who mentally project an image of humanity to fool the inhabitants of Moonbase Alpha. They can only be seen in their true forms by commander Koenig (who has been subjected to an experimental medical treatment) or by someone looking at video recordings of them or affected by "white noise" auditory anesthesia.
* GravitySucks: In "Black Sun", the eponymous Sun's gravity somehow drains ''power'' from Alpha. This is in addition to it dragging an asteroid onto an collision course with Alpha, then somehow dragging it back into space moments before collision.
* {{Irony}}: Of the Tragic kind. Commissioner Simmonds in "Earthbound" doesn't want to leave to luck his one chance to come back to Earth on an alien ship with only one cryogenic unit left. So, he takes hostage the Alpha base and Captain Zantor to secure his spot. After this goes horribly wrong, Captain Koenig reveals that the one candidate the computer picked for the trip was... Commissioner Simmonds.
* HumanAlien:
** Many aliens are suspiciously similar to humans. This goes to the point where "The Last Enemy" has aliens that are basically humans in biker jackets.
** Averted for other aliens who are machine intelligences, bodyless EnergyBeings, or godlike spirits.
** Might have been justified with Maya, who is a VoluntaryShapeshifter, except that she cannot hold a form for long, so her humanoid form is her true form.
* HumansAreTheRealMonsters: The Alphans encounter many HigherTechSpecies (usually of the CrystalSpiresAndTogas sort) who fear contamination or conquest by our [[HumansAreWarriors backward, warlike species]].
* InfiniteSupplies:
** While Alpha has its own mining and production facilities, this isn't enough to avoid the trope.
** Averted in the Season One finale, "Testament of Arcadia". Commander Koenig tells the fanatics who want to settle on a dormant planet that the amount of supplies that they'd take would doom the rest of the Alphans. Justified in that whatever force has diverted the Moon towards the planet Arcadia has also drained the Moonbase's energy supplies to a critical level, bringing their food production capabilities to a screeching halt.
** This also includes a lot of the changes between season one and two. You can ''perhaps'' justify the new jackets, tools and weapons away as just something they already had in storage, but somehow they found the resources to install/renovate whole sections and departments.
* JumpScare:
** Invoked in many episodes making the show surprisingly frightening, especially for younger viewers. Typically a visual shock would be coupled with the sudden sound of screaming. Notable examples include the paintings in "End of Eternity", and the burned ghost in "Troubled Spirit".
** "The Immunity Syndrome" also attempted it with the SkeletonCrew reveal, although with a dose of {{Narm}} since it's hard to imagine any of the three men present screaming like that.
* LimitedSoundEffects: the alien sound effects were rather ''good''. However, they soon became rather ''familiar'', with everything from a NegativeSpaceWedgie to an planet-based lifeform making the same sound across two seasons.
* MadScientistsBeautifulDaughter: Maya's role in the episode where she's introduced, "The Metamorph". She has full confidence in her father Mentor's good intentions, until Koenig convinces her he's a dangerous madman. Then she turns coat.
* MaybeMagicMaybeMundane: There is never a direct answer about what made the Moon change course towards Arkadia, remain in orbit for some time, drain a large amount of power from Moonbase Alpha, and then send it back on its merry way; or if the beings that lived on Arkadia are really AncientAstronauts (or more specifically humanity's ancestors); or if Luke's and Anna's sudden bout of fanaticism is actually their own choice. What remains is a tale pretty similar to that of Adam and Eve.
* MisplacedWildlife: "The Metamorph" shows [[Creator/BrianBlessed Mentor]] having a "lion" on an alien planet. Later subverted when we discover that said lion is a form assumed by Maya.
* MonsterOfTheWeek: The second season became this, upping the action quota and de-emphasizing the psychodrama, to the dismay of some fans and the delight of others.
* NeckLift: Peter Bowles as Balor in "End of Eternity".
* NoImmortalInertia:
** The youthful villain of the episode "The Exiles" has spent 300 years in cryosleep; part of the technology involves a membrane, so thin it's invisible, covering his body. When Helena claws at the membrane, the years quickly catch up to him and he [[RapidAging dies of old age]].
** Also done in the episode "Death's Other Dominion": '''something''' about a certain [[SingleBiomePlanet ice world]] kept the survivors of an exploratory ship unaging for centuries. When [[Creator/BrianBlessed one of them]] tries to leave... the effect is quite gruesome, and the fact that he's holding Helena's hand at the time doesn't help.
* NoPronunciationGuide:
** The pronunciation of "Koenig" is all over the place. Depending on who is talking it's either "Kay-nig" or "Ko-nig."
** Helena isn't immune either; being called "[=HELLena=]" or "[=HeLEEna=]" at various points.
* {{Novelization}} / ExpandedUniverse: Adaptations of the episodes at first (with multiple changes to make them both fit together within a novel and also some changes done between final shooting script and broadcasted episode), then swinging towards the latter as they went on with multiple original stories set between Breakaway and "Message From Moonbase Alpha". A trilogy of the ExpandedUniverse books ("Survival", "Alpha" and "Omega") even go as far as work on bringing Professor Bergman BackFromTheDead (making the deleted line from "The Metamorph" canonical but performing changes about the situation where it happened) and stranding him away from Alpha for a while, making him the P.O.V. character of a conflict between an alien race and an invasion of the "dragons" from the episode "Dragon's Domain". The novels also expand the mythology of the "cosmic intelligence" encountered on "Black Sun" and referred to on other episodes (like "War Games").
* ObstructiveBureaucrat: even before his definitive FaceHeelTurn, Commissioner Simmonds is only too willing to undermine Koenig, including offering to punish Koenig in front of alien guests.
* OmnidisciplinaryScientist:
** Professor Bergman, who is expected to have answers to any conceivable scientific or philosophical question.
** In the second season Maya takes over this role.
* OperationBlank: "Operation Exodus", the plan to evacuate Moonbase Alpha. The struggle to locate a proper planet to evacuate the Alphans ''to'' is an important part of the plot in many episodes.
%% The following is both a ZCE or a generic example. Please elaborate.
%% * PlanetOfHats: Mostly of the "[[PunyEarthlings we don't give a damn about humanity and the Alphans' plight]]'' camp.
* PowerPerversionPotential: Deliberately invoked and [[LampshadeHanging lampshaded]] by [[VoluntaryShapeshifter Maya]], and played primarily for comedic value.
* PreCap: The introduction to each first-season episode contains a montage of action shots from the episode, often of Eagles blowing up or people being thrown across rooms by explosions. This gives away nothing of the plot since it is presented without context.
* PromotionToOpeningTitles: Prof. Victor Bergman soon got his own appearance in the opening credits.
* RecycledSoundtrack: And then some, with music from other Gerry Anderson shows (and assorted library pieces) being used to bolster the few episode scores Barry Gray composed for season one. (Derek Wadsworth also only did about five episodes in season two, and they were reused as well.)
* RedShirt: The plots do include expendable crew characters (when a previously unknown face is seen in an Eagle cockpit, there's a large chance that Eagle will blow up), but the FridgeHorror of the fact that there will be no replacements gives each loss a terrible impact.
* RememberTheNewGuy: Tony Verdeschi and Bill Fraser in Season Two.
* ReTool: From Season One to Season Two, into a more "action-packed" series and less cerebral (some would argue [[IdiotPlot a lot less cerebral]]) plots. Also removing some of the main characters of said first season, [[ChuckCunninghamSyndrome some of them unexplained]].
* ReversePolarity: in "Black Sun", the innovation behind Bergman's protective shield is to ''reverse'' the 'pressure' of the Black Sun, instead of just negating it. How reversing differs from negating is not explained.
* SciFiWritersHaveNoSenseOfScale:
** The moon is variably described as being billions of kilometers, miles, and light-years from Earth, resulting in roughly equal difficulty in returning despite the fact that the first case would put the moon closer to Earth than Saturn, while in the latter case the moon would be vastly more distant from the Milky Way galaxy than the Great Wall, currently the largest known feature of the universe. It (the moon) passes between star systems at speeds fast enough to go through a star system per week, yet remains close enough to each and slow enough to reach a planet via shuttle for days at a time.
** In "Black Sun", a survival Eagle is equipped with 5 weeks' supplies. As a sublight vehicle, there is no chance it will get anywhere in five weeks. They also intend that a gravity shield which protects Alpha will slow the approach of the ''entire Moon'' to the Black Sun (though, to be fair, neither Koenig or Bergman were really expecting it to work for very long).
* ScreamingWoman: frequently. Somewhat justified, since none of the crew signed on expecting the dangers they encounter. If no woman was present, a screaming man often made an acceptable substitute. Screams were sometimes overdubbed, leaving you wondering who it was who screamed.
* ShinyLookingSpaceships: Averted with the Eagle Transporters, thoroughly unglamorous work vehicles, kind of like dump trucks in space.
* SkeletonCrew
** "The Testament of Arkadia" had a cave with skeletons seated around a table.
** "The Immunity Syndrome" plays straight the 'turn the captain's chair round to reveal the corpse' trope. In context it wasn't much of a surprise, so of the three fully grown men present, one wonders which it was who screamed..
* SpaceClothes: Not as bad as some examples, but the unisex, beige jumpsuits are [[{{Zeerust}} still very 70s]]. The second season actually manages to tone this aspect down by adding a jacket to the basic moon base uniform.
* SpaceIsNoisy: Spectacularly in "The Last Enemy".
* SpellMyNameWithAThe: [[InvertedTrope Inverted]] for the Moonbase's main computer which is called just "Computer" (even on some moments where adding a "the" would be correct) by the characters.
* SpiritualSuccessor: The moonbase setting, with the living quarters, control room and Eagle launch pads, seems like an expanded version of the moonbase in ''Series/{{UFO}}''. [[WhatCouldHaveBeen The original concept of the show]] was a Moonbase-centric, 1999-situated continuation of ''Series/{{UFO}}'', but in the actual show the subject matter and typical plots are very different.
* StarfishAliens: Any of the alien encounters that isn't a HumanAlien or RubberForeheadAlien.
* StockSoundEffects: a Main Mission Red Alert alarm (heard in "Black Sun") sounds exactly like a tape recording of an antiquated mechanical alarm played through a bad loudspeaker.
* TeachHimAnger: A peculiar example in "A Moment Of Humanity". The reason why [[AIIsACrapshoot a robotic takeover of a planet]] has not gone as far as to kill their masters is because they don't know how to feel (or ''act'') violently, so they abduct some of the Alphans and try to force them (in various ways, including seduction) to act violent around them so they can learn.
* TerraDeforming: In one episode, the Alphans make contact with Earth, where it's a couple of centuries later due to relativity or something, and the entire population lives in domed cities because the outside environment is toxic. That exact phrase "Who needs nature" has become something of a CatchPhrase, and you get the sense that nobody on Earth is too bothered about the loss of the ecosystem.
* TokenMinority:
** Ben Ouma, Moonbase Alpha's computer expert in "Breakaway", the first episode. Personal conflicts with the rest of the cast actor meant that actor Lon Stratton only appeared in one episode. Rather than recast the role, the character of Ouma was replaced with...
** David Kano, Moonbase Alpha's computer expert in the rest of the first season. He averts his "mere token" status fairly well for a 70s series, and he certainly gets a lot more to do per episode than, say, Lt. Uhura.
** Doctor Matthias, as well, has an important role in many episodes, being one of only two doctors on the base. Unlike Kano he returns for season two, although the character only appears in two episodes of the final season.
* TwentyMinutesIntoTheFuture:
** The story kicks off on September 9th, 1999.
** ''Voyager's Return'' deals with an interstellar space probe launched from Earth in ''1985''.
* VaporWear:
** The thin fabric of the first-season uniforms makes it rather obvious that most of the women aren't wearing bras.
** In one episode, Sandra suffers ClothingDamage that leaves her back bare, showing that she isn't wearing anything under her uniform.
** Some of the clothes worn by female aliens, or by female Alpha crewmembers when adopting native dress, are cut in a way that implies this.
* VoluntaryShapeshifting: Maya, who has the ability on her own. Her father, who's played by Creator/BrianBlessed, has a computer that can do this to larger objects and, potentially, a whole planet.
* WagonTrainToTheStars: With the added problem that there is no way of controlling nor ''stopping'' this train.
* WeWillNotHavePocketsInTheFuture: The uniforms conspicuously lack pockets, probably because it would ruin their lines. Nobody ever seems to need to carry around any small objects.
* WhatHappenedToTheMouse: The first baby born on the moonbase in the episode "Alpha Child" is never mentioned again.
* XDaysSince: Episodes in the second season usually begin with the narration "X days after leaving Earth's orbit". The totals, however, frequently don't agree with numbers used during the first season, or with each other.
%% * YouCantFightFate
* YouFailAstronomyForever: All exterior shots of the moonbase are illuminated by bright sunlight, and always from the same angle - even when the moon is in deep space, light years from the nearest star.
%% YouLookFamiliar is a trivia trope and has been moved to the Trivia tab
* {{Zeerust}}
** The main computer is pictured in a way typical of the time before the public was exposed to computers: it seems to be a sort of oracle that can solve any problem given enough input data.
** On the other hand, the input and output devices used by the computer are very primitive: enormous wall-mounted keyboards (with unmarked keys) that seem to require experts to operate (the fact some people spontaneously develop the capacity to input information on Computer ''at all''-let alone at an insanely quick speed-is the first sign that something is not right on a couple of episodes), and output printed on narrow paper tape that has to be torn off and read aloud by an operator.
** Many shots of high-tech equipment featured the large, open-reel tape drives typical of 1970's computers (but in real life made obsolete long before 1999).
** On the same page, it's easy to notice that various "portable terminals" that appear throughout the series (such as for example on "Testament Of Arcadia" ) are actually calculators of the type that were cutting-edge technology in 1975.
** The first season's beige, unisex uniforms with flared trouser legs and broad, shiny belts -- and the no-bra look for the women -- seem very much like Fashion/TheSeventies today.
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!!Trope-based episodes:

* AIIsACrapshoot: "The Infernal Machine", "Brian the Brain", "A Moment Of Humanity".
* AllJustADream: "War Games".
* AncientAstronauts: Implied in [[spoiler: "The Testament of Arcadia"]].
* {{Antimatter}}: "Matter of Life and Death", "A Matter of Balance"
* AscendToAHigherPlaneOfExistence: "Collision Course"
* [[UnrealisticBlackHole Black Hole]]: "Black Sun"
* BrokenAce: "Dragon's Domain"
* ContemporaryCaveman: "The Full Circle"
* CreepyChild: "Alpha Child"
* DeadManWriting: "Space Warp"
* DerelictGraveyard: "Dragon's Domain"
* DeusExNukina: Averted on "Space Brain"-by the time a solution is formulated which requires nukes to be performed, [[DiabolusExMachina complications happen]] which make said nukes unavailable.
* DownerEnding: Oooh boy... Lots of 'em. "Breakaway", "Death's Other Dominion", "Space Brain", "War Games", "Dragon's Domain", "The Testament of Arcadia", "Journey to Where", "The Dorcons" noteworthy examples.
* EldritchAbomination: "Space Brain", "End of Eternity", "Dragon's Domain". How the aliens in "War Games" view the Alphans.
* EvilTwin: "Seed of Destruction"
* {{Gendercide}}: "The Last Enemy"
* GiantSpaceFleaFromNowhere: "The Beta Cloud"
* TheGreatRepair: The [[TwoLinesNoWaiting Koenig/Verdesci sub-plot]] of "Space Warp".
* GrowBeyondTheirProgramming: "Brian the Brain"
* HarmlessFreezing: "The Mark of Archanon". Subverted in "The Exiles", where the Alphans invoke this trope, unwittingly freeze the MonsterOfTheWeek, and are horrified by it.
* HumansAreTheRealMonsters: "War Games", invoked In-Universe in "The Exiles" and "The Last Sunrise".
* HuntingTheMostDangerousGame: "The Rules of Luton"
* ImAHumanitarian: [[spoiler: "Mission of the Darians"]], in a way, also [[spoiler: "The Metamorph"]].
* ImmortalitySeeker: "The Dorcons". Deconstructed hard in "Death's Other Dominion".
* [[IntrepidMerchant Intrepid Merchants]]: "The Taybor"
* InvoluntaryShapeshifting: "Space Warp"
* MadScientist: "The Metamorph"
* MagicalSecurityCam: in "Black Sun", Main Mission watches a side view of an Eagle, even though it's distant and heading ''away'' from Alpha.
* MushroomSamba: Happens to Paul Morrow on "The Last Sunrise", courtesy of alien mushrooms.
* {{Terraform}}: Done to the Moon by aliens on "The Last Sunrise". [[YankTheDogsChain Removed by the aliens by the episode's end, once the Alphans are comfortably away from their planet]] (they believe that HumansAreTheRealMonsters ''that'' badly).
* TheMutiny: "The Testament of Arcadia", "The Seance Spectre"
* OurVampiresAreDifferent: "Force of Life", in that Zoref is a heat-seeking one.
* OurWormholesAreDifferent: "Black Sun", "Space Warp"
* PhonyPsychic: The bad guy of "The Seance Spectre" is an Alphan that has not only drawn several people into a cult of personality by making them believe that he is actually capable of listening to spirits that guide him, but has also been driven to madness and believing his own lies, thinking that a DeathWorld that the Moon is about to pass by is the best place to evacuate the Alphans to-and doing anything, including murder and trying to pull off a second [[EarthShatteringKaboom Breakaway]], to make the Alphans go to the planet.
* PlayingWithSyringes: "Missing Link", invoked in "The Metamorph".
* RipVanWinkle: "The Mark of Archanon", [[spoiler: "The Exiles"]].
* RedemptionEqualsDeath: Various episodes, but the one most apparent is "Voyager's Return".
* ShapeshifterSwanSong: Happens to Maya on "Space Warp". The plight of the Alphans then becomes 1) saving her from dying and 2) preventing the highly destructive monsters that she's changing into from wrecking the Moonbase with their rampage.
* SleeperStarship: "Earthbound", "The Exiles", "Dorzak"
* SpaceClouds: "The Beta Cloud", "The Lambda Factor"
* SplitPersonality: Implied in "The Infernal Machine".
* StableTimeLoop: The final twist of [[WhereAreTheyNowEpilogue "Message From Moonbase Alpha"]]: [[spoiler: Benes' final report from Alpha, pleading those on Earth to remember them and sent through a boosted carrier wave back to Earth but with the Alphans not knowing when (or ''if'') it would arrive, went back in time and was the Meta Planet's wave, which pretty much was the trigger for ''the whole series''.]]
** [[spoiler: Also the final twist of "The Troubled Spirit", [[YouCantFightFate in a fashion]]: the titular spirit is an Alphan which has been so horribly burned that he is almost unrecognizable and is on a rampage to kill and destroy, and the man who unwillingly brought it into being sacrifices himself by fighting it. At the very end, his wrecked and highly burned body is the spirit's]].
* TimeyWimeyBall: [[spoiler: "The Troubled Spirit"]].
* VoluntaryShapeshifting: "The Metamorph", in particular.
%% WhatCouldHaveBeen is a Trivia trope. It belongs on the Trivia subpage.
* WorthIt: Part of the speech that gives the TitleDrop to "A Moment Of Humanity": for one of the humanoid robots to feel it, it believes as it dies, was worth the destruction of his entire race.
* {{Yandere}}: Shermeen in "A Matter of Balance"
* YouCantFightFate: [[spoiler: "The Troubled Spirit". The man who called the spirit into being was, in the end, the spirit in life-with his highly-burned body being the final evidence]].
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