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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 had hilariously odd names, especially for those who lived 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 featured 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).
* AndIMustScream:
** The fate of Commissioner Simmonds in "Earthbound".
** Also Balor in "End of Eternity". Not only did 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
%% * AppliedPhlebotinum
* 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 was 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 allowed the moon to fly ''through'' a black hole. The shields stop working every time they would be detrimental to the plot.
* 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 seemed to be either this or nurses. The only female regulars shown to perform any work of consequence were Dr. Russell and Sandra Benes (and, in the second season, Maya), though Sandra was clearly working in a subordinate position.
** Some individual episodes had e.g. female scientists or female aliens playing an important role, but these characters were 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 were alien intelligences that cared 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 managed to beat them back, however]], even if sometimes it had a great price. And on the flip side, sometimes ''benevolent'' aliens appeared (and Koenig and Bergman firmly believed that ''something'' had 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 comsetic 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 programmed their ship make a pit stop on the Moon. When the Moon was blasted into deep space, the ship duly diverted 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 would constantly be 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 adopted, or were forced to adopt, native dress while visiting planets, those clothes sometimes were more on the {{Stripperific}} side.
*** Some cases of ClothingDamage that turned the uniforms into VaporWear.
*** In one episode, a crewmember was possessed by an alien that craved energy from the environment, which drove him to the base solarium. This gave 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 projected an image of humanity to fool the inhabitants of Moonbase Alpha. They could only be seen in their true forms by commander Koenig (who had been subjected to an experimental medical treatment) or by someone looking at video recordings of them or affected by "white noise" auditory anesthesia.
* HumanAlien:
** Many aliens were suspiciously similar to humans. This went to the point where "The Last Enemy" had aliens that were basically humans in biker jackets.
** Averted for other aliens who were machine intelligences, bodyless EnergyBeings, or godlike spirits.
** Justified with Maya, who was a VoluntaryShapeshifter.
* 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.
** In-universe this would also include a lot of the changes between season one and two. You could ''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.
* MaybeMagicMaybeMundane: There is never a direct answer about what made the Moon change course towards Arkadia, remain in orbit for some time, drained a large amount of power from Moonbase Alpha, then send it back on its merry way-or if the beings that lived on Arkadia were really AncientAstronauts (or more specifically humanity's ancestors), or if Luke's and Anna's sudden bout of fanaticism were actually their own choice. What remains is a tale pretty similar to that of Adam and Eve that Koenig is only hopeful that those two succeed.
* 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".
* NoPronunciationGuide: The pronunciation of ''Koenig'' was all over the place. Depending on who is talking it's either ''Kay-nig'' or ''Ko-nig.'' Helena wasn't immune either; being called ''Helen-a'' or ''Hel-lee-na'' at various points.
** The two main pronunciations of Koenig's name were "Ko-nig" or "Ko-ning". If anybody really did say it as "Kay-nig", it probably only happened once.
* {{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").
* OmnidisciplinaryScientist: Professor Bergman and later Maya.
* 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.
* 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 contained a montage of action shots from the episode, often of Eagles blowing up or people being thrown across rooms by explosions. This gave away nothing of the plot since they were presented without context.
* 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.)
* 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]].
* SciFiWritersHaveNoSenseOfScale: The moon was 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) passed between star systems at speeds fast enough that the passengers went through a star system per week, yet remained close enough to each and slow enough to reach a planet via shuttle for days at a time.
* ShinyLookingSpaceships: Averted with the Eagle Transporters, thoroughly unglamorous work vehicles, kind of like dump trucks in space.
* SpaceClothes: Not as bad as some examples, but the unisex, beige jumpsuits are [[{{Zeerust}} still very 70s]]. The second season actually managed to tone them down by adding a jacket to the basic moon base uniform.
* SpaceIsNoisy: Spectacularly in "The Last Enemy".
* SpellMyNameWithAThe: InvertedTrope: the Moonbase's main computer was plainly called "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 alien encounter that wasn't a HumanAlien or RubberForeheadAlien.
* 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 averted this trope 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, had an important role in many episodes, being one of only two doctors on the base. Unlike Kano he returned for season two, although the character only appeared in two episodes of the final season.
* TwentyMinutesIntoTheFuture: The story kicks off on September 9th, 1999.
* VaporWear:
** Most of the women (with the notable exception of Dr. Russell) are either clearly not wearing bras under their uniforms, or wearing "no-bra" bras designed for a similar effect.
** 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 implied 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: Multiple instances; but no guest played more than two different characters.
** Most notably, Catherine Schell guest-starred in first-season episode "Guardian of Piri"; then in the second season, joined the regular cast as [[MsFanservice beautiful]] [[RubberForeheadAliens alien]] [[VoluntaryShapeshifting metamorph]] Maya.
** Creator/BrianBlessed played Dr. Cabot Rowland in an episode of the first season (dying at the end of it), then returned in the second season to play Maya's father (and died again).
** Isla Blair and Stuart Damon also play two different characters each.
* {{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"
* 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.
* 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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