[[quoteright:318:[[DoctorWho http://tvtropes.org/pmwiki/pub/images/WWII_Nazi_Dalek_by_Promus_Kaa.jpg]]]]
[[caption-width-right:318:[[http://promus-kaa.deviantart.com/art/WWII-Nazi-Dalek-55751474 AUS-RO-TTEN! AUS-RO-TTEN!]]]]

Aliens come from another planet. Their entire culture, history, and even biology could be radically different from that of us Earth-folk. It should not be surprising if they are ''so'' different that we [[StarfishAliens can't comprehend them at all]].

Fortunately, though, it turns out that aliens are really just humans with some bits [[RubberForeheadAliens glued on]]. Their ideology should look familiar: they're just a thinly veiled stand-in for whoever the public is politically afraid of at the moment, or whoever in Earth history the writers want to [[{{Anvilicious}} anvilize]] the viewers about.

All but the best writers end up giving in to this to some extent. Some actively revel in it.

If a show is lucky enough to be in production when the public's #1 scary ideology shifts, there's a good chance that we'll see the aliens switch dogmas as well. That, or a new race will show up and supplant them as the top threat.

Hybrids are also common, probably because the writers have only a passing understanding of what the popular scary ideology is really all about. Note how often political pundits on both sides [[GodwinsLaw compare their enemies to Nazis]] in recent years to see that this extends beyond fiction.

Slightly more clever writers will do a bit of LampshadeHanging by giving the aliens trappings so obviously derived from the source that you can't help but notice, like putting them in turbans or [[PuttingOnTheReich Nazi uniforms]].

ScaryDogmaticAliens generally take on one of a hand-full of forms:

!![[ANaziByAnyOtherName Aliens as Nazis]]

Among the oldest forms of the trope, aliens are regimented, efficient, and full of xenophobic hate that won't be sated until they've wiped every single one of us from existence. Their leader is a charismatic psychopath who rules with an iron fist. Often obsessed with genetic purity, with the cute little hypocrisy that their leader isn't genetically pure.

* The Daleks from ''DoctorWho'', who literally did Nazi salutes in "The Dalek Invasion of Earth".
** Terry Nation, their original writer, once described the Daleks thusly; as the Nazi technocrats who developed the V-weapons, did concetration camp experiments, etc., and were sometimes recruited by the Allies post-war due to their ability. 'You should think of the Dalek as being a Nazi technocrat locked up inside his own individual paranoid Panzer tank, unable to have human contact, on the edge of hysteria at all times'.
** The German-speaking Daleks in "Journey's End," who transform into religious fundamentalists in the new Dr Who which, given the length of the series, neatly illustrates that depending on the writers so depends the threat.
** The religious overtones are still subordinate to the Dalek notions of racial purity. In "Bad Wol[=/=]The Parting of the Ways", the Daleks' religious language and fervor are a symptom that they've gone mad even by Dalek standards, [[spoiler: because they can't reconcile themselves to being created from human tissue]]. Similarly, the Cult of Skaro departs from the orthodox Dalek Way in the belief that they can thereby find new ways to [[strike:exterminate]] ''EX-TER-MIN-ATE'' non-Daleks; they're not really a "cult" in any other sense.
* The "[[ImAHumanitarian humanitarian]]" aliens from ''{{V}}''. This shouldn't be surprising, seeing as the movie was initially going to be a miniseries based on ''[[http://en.wikipedia.org/wiki/It_Can%27t_Happen_Here It Can't Happen Here]]'', a novel based on the idea of a fascist American dictatorship. The lizards with odd dietary needs were the result of {{Executive Meddling}}.
* The Gua from ''FirstWave'', complete with Nazi uniforms.
* The Morthran from ''WarOfTheWorlds'' season 2, also with uniforms.
* Possibly the cleverest use was on ''[[BabylonFive Babylon 5]]'', where the Nazi-stand-ins were ''humans'' in a FlashForward, down to SS uniforms.
* The Sebaceans in ''{{Farscape}}'', who even used the same red-white-black color scheme. Their enemies, the Scarrans, are even worse. They view the Peacekeepers as inferior, making them the Nazis to other Nazis!
* The Ur-Quan Kohr-Ah from ''StarControl II'', complete with red eyes and black exoskeletons, except that the Ur-Quan and Kohr-Ah are [[spoiler:sympathetic villains with a real tear-jerker story.]] They still count, but it loses a lot of impact.
* Despite being a silly {{B Movie}}, ''Film/{{Teenagers From Outer Space}}'' could easily be a subtle Nazi allegory. In the first place, the aliens intend to exterminate humans from Earth to create "grazing room" for their "Gargon herds" (giant lobsters). Mars is revealed to be a fascist dystopia in the dialogue, and the main villain continually refers to his species as "the supreme race." Essentially, as one viewer put it, "it's like a Martian version of ''Summer of My German Soldier.''"
* The Yevetha from the StarWars ExpandedUniverse. One of the things that the controversial ''NewJediOrder'' series did right was [[spoiler:have the even more dogmatic Yuuzhan Vong wipe out the extremely annoying Yevetha, with the last one committing suicide rather than have a human assist him]].
**[[spoiler: the Atlas retconned this to the Vong wiping out all but 10,000 Yevetha, 7,000 of them being on their smoldering homeworld]].
* In the StarWars film series, we have the Empire, who have enough Nazi parallels to fill a large encyclopedia. The Expanded Universe also makes comparisons between them and pretty much every conquest-happy empire in history.
* Vosk's race from the ''StarTrekEnterprise'' episodes "Storm Front Parts 1 & 2" were not only alien Nazis, but were explicitly allied with the actual Nazis.
* ''StarTrekTheOriginalSeries'' has a PlanetOfHats whose hat is that they actually are Nazis (but they were deliberately engineered into their "hat" by an interfering Earth historian).
* The [current version of the] Thanagarian race from TheDCU (HumanAliens from a planet orbiting Polaris) have an expansionist culture with a fascist government, though individual Thanagarians aren't all evil. Comparisons to the Nazis don't end there: They have a red-and-black insignia and make use of raptor imagery. Recent developments have seen the rise of a new faction of Thanagarian religious fanatics that fit the "aliens as religious fundamentalists" subtrope.
* Not technically aliens, but a subspecies of human, the Helgans of ''Killzone'' are all Nazis on a revenge streak. And boy howdy, when they say they will spare no one, ''they aren't kidding''.
* The Highbreed of ''Ben10AlienForce'', who were (or at least claim to have been) the first race in existence, and consider all other races to be filthy, repulsive, genetically impure abominations that must be exterminated.
* The Nictus of ''CityOfHeroes'', while not Nazis themselves, are closely linked to the Council, and especially the 5th Column, the Nazi enemy group that the Council absorbed. (Requiem, the 5th's leader, is also one of the leaders of the Nictus.)
* KenichiSonoda (of ''GunsmithCats'' fame)'s ''CannonGodExaxxion'''s main antagonists, the Riofaldians, have many similarities to the Nazis, especially the sinister Major Rya'am & Lt. Za'ire, who are basically alien versions of Josef Mengele & IlsaTheSheWolfOfTheSS. Interestingly, they're actually a lot closer overall to another of the Axis Powers, namely ImperialJapan, which is probably why the series was never made into an anime...
* ''[[HumansAreBastards Humans]]'' in ''[[{{Warhammer40000}} Warhammer 40,000]]'' are the closest the setting has, depressingly enough. A xenophobic blend of all the worst periods in human history, but at least in this universe the crusading against [[AlwaysChaoticEvil aliens]] and [[TheCorruption mutants]] is [[CrapsackWorld justified]]...
* The Chitauri in UltimateMarvel
* The Soulless of ''PuzzleQuestGalactrix''. They're obsessed with improving themselves to the point of perfection. Apparently part of that path to perfection is wiping out the imperfect (read: everybody else).
* In the ''{{Stargate SG-1}}'' episode "The Other Side", [[spoiler:the Eurondans turn out to be these in TheReveal.]]

!!Aliens as Communists

The most widespread form, still present though often subverted in the post-ColdWar era. Everyone is the same, individuality is a capital crime. Heavy emphasis on assimilation, which which can either be literal, with them wanting to [[InvoluntaryShapeshifting transmogrify]] humans [[TheVirus into more of their own]], or allegorical via body-snatching. TheVirus may fall into this category.

* The Hanar from ''MassEffect''. [[TheHero Shepard]] can even wryly comment on this whilst bartering with one.
** They're also GrammarNazis and a bit of Religous Fundamentalists although not too bad on that part (the worst they ever do is preach without a license and even that's only if they don't have the money to get one)
* The Cybermen from ''DoctorWho'', with assimilation. When the Daleks and Cybermen both appeared in the new series, they naturally did not mix despite the Cybermen's proposal for an alliance, much like the relationship between Stalin's Russia and Hitler's Germany. Nazism and communism don't mix.
** Despite what people protesting the health care reform tell you.
*** Cybermen. Health care reform. I think I have a solution...
* The Gua from ''FirstWave'', with body-snatching.
* The Mor-taxan from ''WarOfTheWorlds'' season 1, with body-snatching.
* The Borg from ''StarTrek'', with assimilation. Taken even further in Star Trek: Destiny, where it is revealed [[spoiler: that the Borg are a corruption of a near-Utopian society.]]
* The Taelons from ''EarthFinalConflict'' were a minor subversion, in that they were only minimally evil.
* An exception is Green Lantern Kilowog of Bolovax VIX, whose race was so social as to be nearly hive-minded, and eventually chose to work for the Chinese government because China came closest to his race's psychology, in which socialist government and communist economics were the optimal course for society. He never tried to push his ideals on anyone; his role was basically TheBigGuy''/''GeniusBruiser, and he was (and still is) a close friend to all the main-character [=GLs.=]
* The Rikti in {{City of Heroes}}, invaders from another continuum who use psychic powers as a means to attain what is referred to in-game as "monolithic harmony," and even have "priests" whose sole function seems to be ferreting out aberrant thought.[[spoiler:The Rikti also activelly assimilate humans into their species with genetic retrovirii, chemical treatments, and psychic reeducation- the villain group "The Lost" are actually humans half-transformed into Rikti- one of the big secrets in the game is that the Rikti are human; they were engineered into the Rikti by an alien race, and continue to perform the same modifications on their children during pregnancy and childhood.]]
* The bug aliens from ''StarshipTroopers'' were also an metaphor for communism.
* The alien Pod People from the 1956 Invasion of the Body Snatchers are an obvious allegory for Communism with all the replacements being devoid of emotion as well as being driven to infiltrate the rest of humanity and take them over as well. Apparently [[AccidentalAesop this was unintentional.]]
* The alien life form from ''Slither'' utilizes assimilation in the most literal way possible: by having humans possessed by its throat-jumping worm-things ''smush themselves against the alien host until they become part of it''.
* This was the original characterization of the shape-shifting Skrulls of the {{Marvel Universe}}, but they now have been re-invented into the fundamentalists (see entry below).
* [[http://en.wikipedia.org/wiki/Communist_Mutants_from_Space The charmingly titled video game Communist Mutants from Space]] features aliens from the planet [[InSovietRussiaTropeMocksYou Rooskie]] who are turning the inhabitants of other planets into "Communist Mutants" and serve the "Mother Creature", who drinks irradiated vodka.
* The Tau from {{Warhammer 40000}}. Often affectionately referred to as "Blue Space Communists". They're this with a rather large helping of Flat Earth Atheist.
** The Tau are relatively benevolent tho. Their society is actually far less opressive than that of humans, and their brand of assimilation consists of converting surrendered enemies to their ideology (which may feature brainwashing if they do not convert willingly) and giving them a place in their society. Ofcourse in any other setting they'd be at best [[WellIntentionedExtremist]]s, but this is [[CrapsackWorld 40k]] we're talking about, so the fact they give you an option of joining them or dying makes them seem like saintly paragons of virtue in comparison to everybody else.
* Certain subtleties indicate the Autobots might be like this in [[TransformersAnimated the most recent animated series]], namely Optimus' "cog in the great Autobot machine" speech and the fact that the guys put out on space bridge repair duty all seem to be ones who either violated or disregarded conformist Autobot patriotism.
** In fact, according to the BackStory of the G1 cartoon, the Autobots were outright Communist revolutionaries, more or less, being that they were created by the sinister Quintessons as a labor force, [[TurnedAgainstTheirMasters but decided they'd rather control the means of production themselves]]. The Decepticons on the other hand were designed as military hardware & after helping Cybertron to gain its independance they decided a military dictatorship would be the best way to run the new regime, a situation oddly similar to the Chilean Revolution of the 1970s. Kind of strange for an American cartoon from the 1980s...
** The IDW verson it's the Decepticons, a group of hard-luck blue collar workers, lead by a miner (guess who) to overthrow the corrupted Autobot senate.
* Taken to the extreme on the planet Camaxotz from ''A Wrinkle In Time'', so much so that all of the identical children in their identical yards bounce identical balls off their identical garage doors ''in perfect synch with one another''.
* The Tripods Trilogy, with all humans being "capped" by mind-control devices at puberty to assimilate them, although the humans so assimilated [[spoiler: don't become part of the alien culture, but slaves to it, making it either an imperfect analogy or [[StrawmanPolitical an extra advanced one]]]].
* Mostly averted by the Amnion in Stephen Donaldson's ''Gap Cycle''. While they are TheVirus who also constitute a HiveMind, their motivation to assimilate is purely biological. They do not understand politics and are genetically incapable of lying or betrayal: while they do ultimately launch several {{Xanatos Gambit}}s against humanity, these are largely fuelled by their fear and mistrust of human unpredictability. The humans, of course, are at least as afraid of them. In spite of this their first contact vessel is named ''Solidarity'', probably as a ShoutOut to this trope.

!!Aliens as Religious Fundamentalists

The most recent evolution of the trope. It is something of a step forward in that SpeculativeFiction can now depict alien religion as extending beyond "advanced = atheistic; primitive = fooled into worshiping anyone with a [=PDA=]" (see CargoCult), but it's also a step backward in that the new category of alien religion is just a thinly veiled allegory of the most tragic and extreme forms of human anti-social devotion. The Alien as Religious Fundamentalist hates humans because God told them to. God is often a SufficientlyAdvancedAlien.

For maximum points, it should be possible, even likely, that if the alien god does exist, it really isn't averse to humans at all, but is being misrepresented by the alien leadership. To really stick a fork in it, it occasionally turns out that ''humans'' are supposed to be the aliens' "true" gods, according to the correct interpretation of their religion (what this says about the humans who are actually writing the series is [[FridgeLogic best not dwelled on]]).

* The Idirans in Iain M. Banks' Culture novels. The Idirans are more like imperialists than xenophobes, however; they want to conquer the galaxy so that they can improve it. The Chelgrians too, to some extent, with the addition that their heaven is a real place that their technology will take them when they die.
* The Magog and scads of minor villains in ''{{Andromeda}}''. Hell, their name is even a [[TheBible Biblical]] reference.
* The Covenant in ''{{Halo}}''. Technically, their hatred isn't dictated by their Gods though. More their leaders don't like the idea of losing power.
* Perhaps the earliest example on TV is the Morthran from the second season of ''[[Series.WarOfTheWorlds War of the Worlds]]'', who were the prototype of the trope, though they had to be liberally mixed with the Nazi archetype, since the religious fundamentalist archetype wasn't quite ready for public consumption yet.
* The Goa'uld and their followers in ''[[StargateSG1 Stargate SG-1]]'' fit this trope pretty well but the Ori fit it even better, all the way down to disputes over the meaning of symbolic passages in the very King James-sounding Book of Origin. The Goa'uld aren't so much dogmatic as create dogma around themselves to control their underlings.
* The Ilwrath from ''StarControl II'', who worship twin gods of cruelty and pain; their worship rituals take the form of killing and maiming en masse. Did we mention you can drive them into a religious civil war by impersonating these gods? The Kohr-Ah also talk about a religious belief that sterilizing other races will increase the chances of you reincarnating as a Kohr-Ah, so they might count too.
* The aliens who invade Earth in Lester del Ray's 1954 short story "For I Am a Jealous People" are very religious folk...who actually ''do'' have God on their side.
* The Vasudans from ''[[{{Freespace}} Descent: Freespace]]'' are initially depicted as a bunch of religious fundamentalists. The Terrans come across to the Vasudans as a bunch of [[FantasticRacism racist]] [[HumansAreBastards bastards]], so we have a 14-year-war dragging on. Here come the Shivans, all of a sudden the two races agree to split their differences in order to battle the BigBad {{Omnicidal Maniac}}s. However, a splinter group of (yup) [[ScaryDogmaticAliens religious fundamentalist Vasudans]] called the Hammer of Light emerges, who claims it's TheEndOfTheWorldAsWeKnowIt, citing some ancient prophecy about an all-powerful destroyer race, which they claim to be the Shivans. (On a side note, the [[FantasticRacism racist Terrans]] thing was taken to the logical next step in ''Freespace 2'' with a bunch of anti-Vasudan ''Terran'' rebels called the Neo Terran Front) Considering that one of the principal themes of the series is that Terrans and Vasudans are NotSoDifferent, this is more of a subversion than anything else.
* Species 8472, from ''StarTrekVoyager''...at least at first.
* StarWars ExpandedUniverse fans will remember the Yuuzhan Vong, who are probably the most extreme version of this trope. Extreme in that they use only biotechnology, and insist on the genocidal removal of anyone who doesn't use it. They also have a religious devotion to pain, so much so that their ceremonial rite of passage involves cutting off one of their own limbs and replacing it with a biotech limb. And this is from the same universe that produced Ewoks. DarkerAndEdgier much? They also have shades of Aliens as Nazis, as they consider themselves to be a superior race out to purge the universe of impurity.
* The Yuuzhan Vong are a race of shrinking violets compared to [[{{Warhammer 40000}} the ''good'' guys of a certain other sci-fi setting.]] More specifically, to many races in ''that'' universe, ''we'' are the scary dogmatic aliens. The race the above editor is referring to is probably the ''nicest example'' of this trope in 40K, the Tau, who ask politely before invading your face off to forcibly assimilate you into the Greater Good. Still, you're probably better off with them than anyone else...
* The Dominion from ''StarTrekDeepSpaceNine'' is ruled by a race of xenophobic shapeshifters who are venerated as gods by their subjects, who see their war against the Alpha Quadrant as a crusade. The amalgamated nature of the Dominion might suggest elements of Aliens as Communists as well.
* From what we see, only the Jem'Hadar and the Vorta are for sure true believers. There is evidence that many of the other races under the Dominion simply live in fear or go along because they profit by it (this is especially true in early referenes to the Dominion and depictions of their activities). The Founders are said to have an innate need for order and conformity, and the avowed mission of their crusade is to bring this order to the untidy quadrant-next-door. Thus the Dominion may embody several types: the Founders are Aliens as Communists, the Jem'Hadar and Vorta are Aliens as Fundamentalists, and the rest (perhaps) are the thralls of Aliens as Conquistadores.
* In the new ''BattlestarGalactica'', the Cylons are scary dogmatic ''robots'' that try to wipe out humanity because they believe it's God's will. Funny how God seems to be angry at people who they feel have wronged them.
* Marvel's Skrulls now claim that the Earth belongs to them - as per their religious prophecies - laying the foundations for the ''Secret Invasion'' {{Crisis Crossover}}.
* In the ''BabylonFive'' backstory, the Minbari were this kind of alien towards humans who engaged in a kind of holy crusade to destroy humanity due a terrible misunderstanding. They only change their minds and stop just short of destroying Earth when they discover that the human they captured for study not only has the soul of a Minbari, but is the great Valen (A figure to the Minbari is as important as Jesus and Mohammad ''combined''). They confirm the former mindboggler with more captured humans and decide they are harming their own species by killing humans. This is a horrific concept to the Minbari and the ruling council orders their forces surrender to stop this tragedy. In all fairness, Babylon 5 manages to dances on the knives edge of religion, playing with both CrystalDragonJesus and ScaryDogmaticAliens / OutgrownSuchSillySuperstitions without falling on any side and getting {{Anvilicious}}.
**Neroon described Delenn as a "religious fundamentalist". The series did not provide enough information on the religious practices of other Minbari to determine if this was objectively true, or to what extent religious zeal drove her actions. Note that religious fundamentalism in this case may be considered a ''positive'' attribute given the first point raised above.

* Some alien empires in the space age of {{Spore}} conquer others in the name of Spode.
* ''Everyone'' in ''{{Warhammer 40000}}'' to a greater or lesser extent.
** First up, the Imperium of Man, fighting in the name of the immortal God-Emperor. Scary Dogmatic ''Humans''. Xenocidal and imperialist, as happy to wipe out billions of its own people as it is to exterminate entire alien races.
** Chaos. [[CosmicHorror Extra-dimensional malevolent gods and daemons]] that are capable of crossing into the physical realm and [[TheCorruption corrupting the minds and bodies of sentient species.]] Four principal Chaos Gods and countless lesser deities and daemon princes, served by billions of cultists and thousands of ancient daemon-corrupted {{Super Soldier}}s who rebelled against the Imperium during a galaxy-splitting civil war ten thousand years before the setting. [[CardCarryingVillain Unquestionably evil]], delighting in murder and depravity. The four main gods are born from the emotions of hope, love, bravery and acceptance; this should tell you most of what you need to know about 40k's place on the SlidingScaleOfIdealismVersusCynicism.
** Necrons. Once an ancient and technologically sophisticated race, now a SealedEvilInACan in a particularly nightmarish way at the command of the C'Tan Star Gods. TheJuggernaut, {{Determinator}}, CosmicHorror, and just barely shy of a race of {{Omnicidal Maniac}}s.
** The Eldar and Dark Eldar don't really show any fanatic tendencies as well, same with [[BeePeople Tyranids]].
** Tau are, sometimes, an ''inversion'' of this subtrope. They're {{Flat Earth Atheist}]s, and have stated [[DawnOfWar in some materials]] that they don't really mind people being religious as long as they serve the Greater Good. (This being 40K, religious tolerance in this form is actually suicidal - Chaos cults anyone?)
* The Protoss in ''{{Starcraft}}'' not only devote themselves towards the elimination of the Zerg, even if humans are in the way because of their semi-religious beliefs, but even use terms such as zealot and templar.
* Leono and his wraiths from ''SluggyFreelance'', who use God as an excuse to devour all life in the universe (except for flowers).
* Some incarnations of Despero have a distinct Islamic militant flavour to them, since he grew up in the desert. Lampshaded in the ''JusticeLeague'' cartoon when GreenLantern remarks that his Origin Story sounds a little derivative.
* Almost completely averted in EnemyMine, where the alien race, despite being Reptilian Space Muslims, aren't fighting for religion. They're just defending themselves against Human incursion into their space.

!!Aliens as Conquistadores

Possibly even older than aliens as Nazis, and essentially the same practical upshoot in a different package, roaming the cosmos in search of new lands to subjugate and new prizes to claim in the name of the Empire or for their own personal glory. Your subjugation will occasionally be in order to civilize you, but more often will be because might makes right, and those too weak to make a stand don't deserve a say in their own fates. An Alien as Conquistador is likely to be a ProudWarriorRaceGuy. Can mix easily with other types.

* Another Iain M. Banks / Culture example: the Affront. They appropriated this name from the Culture after deciding that since it suits them so well, they might as well just take it. Their entire civilization is based on Might Makes Right, and they are vicious and jovial in equal proportion.
* The Decepticons in almost any ''{{Transformers}}'' series. Fortunately, the Autobots strongly disagree with their attitude.
* The Ur-Quan Kzer-Za from the ''StarControl'' series, who rationalize that they are protecting the races they conquer from both outside destructive forces and their own uncivilized impulses.
* The Goa'uld from Stargate do this for their own personal glory in addition to posing as gods.
* The Imperium from {{Warhammer 40000}} are [[HumansAreBastards Scary Dogmatic]] ''[[HumansAreBastards Humans]]'', and are quite fond of this even though they've already colonized about a million worlds. They also fit the "Space Nazi" mold as above, and most definitely also the "Religious Fundamentalists" (Space Marines are already pretty extreme about it, but there are actual ''Battle Nuns''.)
* The Martians from ''WarOfTheWorlds'' (novel) are looking to conquer Earth for extra room and, naturally, have to wipe out everyone on Earth first.
* The aliens in ''IndependenceDay'', except even meaner.
* The Klingons of ''StarTrek''.
* The Mandalorians of ''StarWars'', especially early in their history.
* Humanity itself from Gurren Lagann, in an alternate Character Interpretation, being expansionist, xenophobic and glory-seeking.
* The Race from ''Worldwar''.
* The Psychlos from BattlefieldEarth. They get bonus point for being chiefly interested in gold.
* The Lorwardians in ''KimPossible''. Not only is their plot to conquer Earth during the GrandFinale, they are also introduced as always carrying world domination gadgets wherever they travel.
* Both Bugs ''and'' Humans in ''StarshipTroopers'' have this motivation.
* The Centauri from ''BabylonFive'', especially back in their Glory Days that they ''never stop yammering about''
* The Combine Empire from ''Half-Life 2'', who not only enslaved Humanity but [[http://half-life.wikia.com/wiki/Combine#Depletion_of_Earth.27s_Resources also drained Earth's oceans using portals.]]
* The Pfhor from {{Marathon}} are evil alien [[WeWillUseManualLaborInTheFuture slavers.]]
* The Varn Dominion from ''{{Terinu}}'' combine this with a dash of Religious Fundamentalism. In their viewpoint, they have a mandate from their gods to preserve all habitable worlds. The sentient races that happen to using them at the time were put there to serve Varn interests.
* The Irkens from InvaderZim have conquered so many planet that they don't even know what to do with every new acquisition. Example: they turned the homeworld of the "horrible rat people" into ''another'' parking lot planet.
* The Kriken empire in {{Metroid}} setting appears to be one of these. Not much is known of them but they're described as being imperialistic and it is know that young Krikens are exiled from their society untill they locate a planet that would be a suitable canditate for an invasion.

!!Other

Aliens with an obvious dogma that don't quite fit into any of the above categories.

* In ''[[TheHitchHikersGuideToTheGalaxy The Hitchhiker's Guide to the Galaxy]]'', the Vogon dogma is [[ObstructiveBureaucrat obstructive bureaucracy]]. In many ways, this makes them the worst of the lot: If the forms are signed, they'll [[EarthShatteringKaboom demolish your planet]], and it's your own fault for not looking into these affairs.
* The Auditors of Reality from ''{{Discworld}}'' are the Vogons, turned all the way [[UpToEleven Up To]] [[strike: Eleven]] [[BeyondTheImpossible Twelve]].
* The Scrin from ''CommandAndConquer'' just want to harvest Tiberium, and stumble across humanity in the process. Having no precedent for a civilization surviving the Liquid Tiberium explosion that attracted them(actually a XanatosGambit by Kane), the Scrin invade with force to attempt to go about their job anyway, leveling cities as "distractionary measures" to keep the humans off balance from this goal. When humanity kicks them back off the planet except for a single Threshold Tower, the Scrin Overlord declares that a full invasion will commence.
** One of the absolute best parts of the Scrin Campaign is when the aliens land and encounter resistance... Their response is basically "These guys are ''still alive''!? And they've not even STOPPED FIGHTING EACH OTHER!? OH. MY. GOD.!"
** The expansion, ''Wrath of Kane'', introduces two Scrin sub-factions. Reaper-17 are ScaryDogmaticAliens played straight, in that they take any actions necessary to annihilate things that stand in front of progress. Traveler-59 are more a cult of subversion (no, not the [[SubvertedTrope trope kind]]) who actively co-opt humans via a method of TheVirus.
** In ''Kane's Wrath'', Kane himself calls the Scrin a "cult of addiction in the guise of a species," giving the mental image of an entire species of militant, highly advanced ''crack addicts'' who are turning planets into giant rocks to snort.
* The ghouls from ''TheyLive'' are all about "trickle down" economics. The entire Earth is their third world, where they do all their evil alien business outsourcing, until Roddy Piper [[ChewBubblegum runs out of bubblegum]] and saves the day. Yes, this movie is intentionally silly.
* The people of Terra in ''FinalFantasyIX'' seek to wipe out the people of Gaia and absorb Gaia's life force in order to keep Terra alive. Dialogue in the game implies that this isn't the first time the Terrans have destroyed a younger planet so they could keep going.
* In ''{{Antares}}'', The Ryall are a subversion. They attack the human race on sight, clearly intent on genocide. Yet when captured, the Ryall do not seem evil. They are not driven by any sort of religious dogma. They simply believe that it is impossible for two sentient species to coexist peacefully. The root of this belief is that, on their homeworld, they fought and wiped out a species of sentient amphibious sharks.
* ''StarTrekVoyager''. The Kazon are clearly meant to be GangBangers [[RecycledINSPACE In Space]]. Likewise in ''StarTrekDeepSpaceNine'' (at least in the early seasons) the Bajorans are former terrorists who have given up their violent ways for politics (PLO and IRA), and newly-liberated Eastern Europeans on the verge of political anarchy.
* The Zuul from the ''SwordOfTheStars'' expansion ''Born of Blood'' are all of the above combined. They are a race of genetically engineered bio-weapons that, instead of having TurnedAgainstTheirMasters, worship them as ''gods''. Anyone else not a god or a Zuul is a slave to be conquered, abused and {{Mind Rape}}d for any viable knowledge they have, and then eaten. Unfortunately for both the Zuul and for the rest of the galaxy, the Zuul have lost their 'gods' and, without anyone to hold their chains, their entire race has turned to a galaxy-wide crusade to find their 'gods again'. This puts them in conflict with all the other species -- and, as mentioned above, exterminating other species is what they were made for.
** The Zuul are biologically misogynistic. The Zuul word for Universe is one of their words of Mother. You can see where this is going.
** To clarify, Zuul are marsupials -- their children are kept in pouches, and subdued by their mother's milk, which contain a powerful narcotic. The moment the adult Zuul stops producing milk, the children awaken and eat their mother from the inside. Or if the children are removed from the pouch and put near anything edible. That universe analogy? Yeah, you can figure that part out for yourself. And in a wonderful subversion, the Zuul, once conquered, occasionally remark ''Perhaps we have met our masters after all''
* The 2008 remake of ''TheDayTheEarthStoodStill'' features aliens as ecoterrorists, who want to wipe out human civilization and infrastructure to preserve the biosphere.
* The [[WingCommander Kilrathi]] are ImperialJapan [[foldercontrol]]

[[folder: In Space as Petting Zoo People ]]
! They've even got the honor-obsessed warrior code, AttackAttackAttack battle tactics, and Emperor. All they're missing are headbands and [[KatanasAreJustBetter katana]].
* The Space Pirates from {{Metroid}} games, when not pirating stuff, seem to believe it is their manifest destiny to conquer the galaxy and nothing should be allowed to stand in their way. In ''Metroid Prime 3'', where Dark Samus brainwashes their leaders, they become full-blown religious fundementalists, forming a cult that worships [[GreenRocks Phazon]] and considers Dark Samus to be their prophet.
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