History Main / DittoAliens

15th May '17 4:32:01 PM AthenaBlue
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->'''Luke Rattigan''': How... do you tell each other apart?\\
'''General Staal''': We say the same of humans.
-->-- ''Series/DoctorWho''

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->'''Luke Rattigan''': Rattigan:''' How... do you tell each other apart?\\
'''General Staal''': Staal:''' We say the same of humans.
-->-- ''Series/DoctorWho''
''Series/DoctorWho'', [[Recap/DoctorWhoS30E4TheSontaranStratagem "The Sontaran Stratagem"]]



[[folder: Anime and Manga ]]

* The Emilys in ''Anime/StrainStrategicArmoredInfantry'' looked exactly the same and even shared the same ''consciousness''.

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[[folder: Anime [[folder:Anime and Manga ]]

* The Emilys in ''Anime/StrainStrategicArmoredInfantry'' looked exactly the same and even shared the same ''consciousness''.
Manga]]



* The Emilys in ''Anime/StrainStrategicArmoredInfantry'' looked exactly the same and even shared the same ''consciousness''.



[[folder: Comic Books]]

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[[folder: Comic Books]] [[folder:Comic Books]]
* ''ComicBook/{{Shakara}}'': Many alien species look like they might as well be clone populations, including the Krull, the Subbubi, the Psicos, and even the Shakara themselves.



* ''ComicBook/{{Shakara}}'': Many alien species look like they might as well be clone populations, including the Krull, the Subbubi, the Psicos, and even the Shakara themselves.



[[folder: Fanfic]]

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[[folder: Fanfic]][[folder:Fanfic]]



[[folder: Film]]
* The unnamed "miner" aliens from ''Film/GalaxyQuest'' are a pack of cute, adorable, identical-looking [[spoiler:cannibalistic]] blue-skinned critters.
* Averted in ''Franchise/StarWars'' where most of the aliens given multiple member screen time are diverse. This includes suits (Twi'leks, Wookies, Iridonians, and Ewoks) and computer generated (such as Gungans and Yoda's people). An exception is the Gungan celebration at the end of Phantom Menace, we see a group of absolutely identical CG Gungans dancing in impossible lockstep. Like everything else about the Gungans, it was intended to be funny, but it totally breaks suspension of disbelief.

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[[folder: Film]]
* The unnamed "miner" aliens from ''Film/GalaxyQuest'' are a pack of cute, adorable, identical-looking [[spoiler:cannibalistic]] blue-skinned critters.
* Averted in ''Franchise/StarWars'' where most of the aliens given multiple member screen time are diverse. This includes suits (Twi'leks, Wookies, Iridonians, and Ewoks) and computer generated (such as Gungans and Yoda's people). An exception is the Gungan celebration at the end of Phantom Menace, we see a group of absolutely identical CG Gungans dancing in impossible lockstep. Like everything else about the Gungans, it was intended to be funny, but it totally breaks suspension of disbelief.
[[folder:Film -- Live-Action]]



* The unnamed "miner" aliens from ''Film/GalaxyQuest'' are a pack of cute, adorable, identical-looking [[spoiler:cannibalistic]] blue-skinned critters.
* ''Franchise/StarWars'' averts it, where most of the alien species with multiple members given screen time are diverse. This includes suits (Twi'leks, Wookiees, Zabraks and Ewoks) and computer generated (such as Gungans and Yoda's people). An exception is the Gungan celebration at the end of ''Film/ThePhantomMenace'', we see a group of absolutely identical CG Gungans dancing in impossible lockstep. Like everything else about the Gungans, it was intended to be funny, but it totally breaks suspension of disbelief.



[[folder: Literature ]]

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[[folder: Literature ]][[folder:Literature]]






[[folder: Live Action TV ]]

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[[folder: Live Action TV ]]
[[folder:Live-Action TV]]
* Lampshaded in ''Series/ThirdRockFromTheSun'' - in an episode where the (alien) family is trying to decide what (human) race they are, it is pointed out that Dick has never noticed that Nina is black, at which point he quips [[InnocentBigot 'you people all look alike to me']].



* ''Series/BuckRogersInTheTwentyFifthCentury'': Played straight in an episode of where one race has no diversity of appearance beyond male/female.



** In ''[[Recap/DoctorWhoS1E7TheSensorites The Sensorites]]'', the humans' inability to tell the Sensorites apart inspires one Sensorite to impersonate another with no more disguise than a change of clothes; the imposture fools everyone he meets, including some of his fellow aliens.
*** That's right, the Sensorites were all physically identical, to the point that even they themselves could not tell each other apart except for their clothing, and not one of them had ever noticed this fact in all of the species long history.
** Occasionally [[BrokenAesop problematic]] - both "The Silurians" and "The Sea Devils" have the moral that the Silurian monsters are all individuals and should be treated as such. Having identical, inexpressive faces and the same actor doing all of the voice work does not really contribute to this. Fortunately, for a later story by the same writer with the same themes, "Frontier in Space", the effects department gave all of the Draconians different faces, which makes them a lot easier to see as people. The Revival series also redesigns the Silurians to look like beautiful lizard women (though two prominent Silurians in different stories still look and sound identical, thanks to [[YouLookFamiliar traditional Who-style casting]].
** An odd exception: the Sontarans, explicitly described as being a race of clones, ''didn't'' all look alike, firstly because a variety of different actors played them and secondly because the costume and make-up was mildly revised for nearly each story in which they appeared. (The first and second Sontaran stories, ''The Time Warrior'' and ''The Sontaran Experiment'' averted this by having the same actor player play the three Sontarans seen in that story. Even though they did have a continuity mix-up in the latter story.) Despite there still being slight differences between the two Sontarans whose un-masked faces we see on scene in "The Sontaran Stratagem" (slight makeup changes on the same actor) the Ditto Aliens phenomena is lampshaded in the typical way "we say the same of humans." It's since been explained that the different looks are different batches of clones, and by sheer coincidence all of the ones seen in the New Who era are the ones that are played by Dan Starkey.

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** In ''[[Recap/DoctorWhoS1E7TheSensorites The Sensorites]]'', [[Recap/DoctorWhoS1E7TheSensorites "The Sensorites"]], the humans' inability to tell the Sensorites apart inspires one Sensorite to impersonate another with no more disguise than a change of clothes; the imposture fools everyone he meets, including some of his fellow aliens.
*** That's right, the Sensorites were all physically identical, to the point that even they themselves could not tell each other apart except for their clothing, and not one of them had ever noticed this fact in all of the species species' long history.
** Occasionally [[BrokenAesop problematic]] - -- both [[Recap/DoctorWhoS7E2DoctorWhoAndTheSilurians "The Silurians" Silurians"]] and [[Recap/DoctorWhoS9E3TheSeaDevils "The Sea Devils" Devils"]] have the moral that the Silurian monsters Silurians are all individuals and should be treated as such. Having identical, inexpressive faces and the same actor doing all of the voice work does not really contribute to this. Fortunately, for a later story by the same writer with the same themes, [[Recap/DoctorWhoS10E3FrontierInSpace "Frontier in Space", Space"]], the effects department gave all of the Draconians different faces, which makes them a lot easier to see as people. The Revival revival series also redesigns the Silurians to look like beautiful lizard women (though two prominent Silurians in different stories still look and sound identical, thanks to [[YouLookFamiliar traditional Who-style casting]].
people.
** An odd exception: the Sontarans, explicitly described as being a race of clones, ''didn't'' all look alike, firstly because a variety of different actors played them and secondly because the costume and make-up was mildly revised for nearly each story in which they appeared. (The first and second Sontaran stories, ''The [[Recap/DoctorWhoS11E1TheTimeWarrior "The Time Warrior'' Warrior"]] and ''The [[Recap/DoctorWhoS12E3TheSontaranExperiment "The Sontaran Experiment'' Experiment"]] averted this by having the same actor player play the three Sontarans seen in that story. Even though they did have a continuity mix-up in the latter story.) Despite there still being slight differences between the two Sontarans whose un-masked faces we see on scene in [[Recap/DoctorWhoS30E4TheSontaranStratagem "The Sontaran Stratagem" (slight makeup changes on the same actor) Stratagem"]], the Ditto Aliens phenomena is lampshaded in the typical way "we say the same of humans." It's since been explained that the different looks are different batches of clones, and by sheer coincidence clones.
* Averted in ''Series/{{Farscape}}'' where pretty much
all of the ones alien species seen have distinct differences among individuals.
* The Asgard
in ''Series/StargateSG1'' and ''Series/StargateAtlantis'' are all identical, though it is [[JustifiedTrope justified]] by the New Who era are the ones fact that they are played by Dan Starkey.all clones. (In the finale Daniel Jackson says they tell them apart from their voices). Other alien races such as the Wraith, are similar to one another, but have enough differences between themselves to be unique. The Wraith also have cookie-cutter soldiers, but those are clones.



* The Asgard in ''Series/StargateSG1'' and ''Series/StargateAtlantis'' are all identical, though it is [[JustifiedTrope justified]] by the fact that they are all clones. (In the finale Daniel Jackson says they tell them apart from their voices). Other alien races such as the Wraith, are similar to one another, but have enough differences between themselves to be unique. The Wraith also have cookie-cutter soldiers, but those are clones.
* Averted in ''Series/{{Farscape}}'' where pretty much all the alien species seen have distinct differences among individuals.
* ''Series/BuckRogersInTheTwentyFifthCentury'': Played straight in an episode of where one race has no diversity of appearance beyond male/female.
* Lampshaded in ''Series/{{Third Rock From The Sun}}'' - in an episode where the (alien) family is trying to decide what (human) race they are, it is pointed out that Dick has never noticed that Nina is black, at which point he quips [[InnocentBigot 'you people all look alike to me']].



[[folder: Tabletop Games ]]

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[[folder: Tabletop Games ]]
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[[folder: Toys ]]

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[[folder: Toys ]]
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[[folder: Video Games ]]

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[[folder: Video Games ]]
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[[folder: Web Comics ]]

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[[folder: Web Comics ]]
[[folder:Web Comics]]






[[folder: Western Animation ]]

* ''WesternAnimation/ExoSquad'' plays with this; it is mentioned several times that Terrans can't tell Neosapiens apart, to the point that every Neo has to have a unique "broodmark" tattooed on his/her head in order to distinguish them. However, they all look quite different.
* ''WesternAnimation/RoughnecksStarshipTroopersChronicles'': All the characters are SerkisFolk, but the humanoid "Skinny" aliens are all the same model in (occasionally) different clothes. As are the bugs, within a given breed. The "Skinny" Colonel T'phai uses the "all humans look alike" line at one point.
* On ''WesternAnimation/{{Futurama}}'', the aliens of Omicron Persei 8 take the "humans all look the same" philosophy to ludicrous extremes by not being able to tell the difference between a woman with one eye and a orangutan wearing [[WigDressAccent clothes, a wig, and an eyepatch]].

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[[folder: Western Animation ]]

[[folder:Western Animation]]
* ''WesternAnimation/ExoSquad'' plays with this; it is mentioned several times that Terrans can't tell Neosapiens apart, to the point that every Neo has to have a unique "broodmark" tattooed on his/her head {{Averted}} in order to distinguish them. However, ''WesternAnimation/AmericanDad''--when we finally see more of [[JerkAss Roger]]'s species, they all still look quite different.
* ''WesternAnimation/RoughnecksStarshipTroopersChronicles'': All the characters are SerkisFolk,
like TheGreys but the humanoid "Skinny" aliens are all the same model differ a lot in (occasionally) different clothes. As are the bugs, within a given breed. The "Skinny" Colonel T'phai uses the "all humans look alike" line at one point.
* On ''WesternAnimation/{{Futurama}}'', the aliens of Omicron Persei 8 take the "humans all look the same" philosophy to ludicrous extremes by not being able to tell the difference between a woman with one eye and a orangutan wearing [[WigDressAccent clothes, a wig, and an eyepatch]].
body type.



* The [=LGMs=] of ''WesternAnimation/BuzzLightyearOfStarCommand'' all look identical in addition to having a HiveMind. On the flip side, one LGM called Mira "Booster" with the explanation that "you all look the same". Mira and Booster aren't even the same species; Mira is a [[GreenSkinnedSpaceBabe Blue Skinned Space Babe]], and Booster is a large red implied-to-be-reptilian being.
* ''WesternAnimation/ExoSquad'' plays with this; it is mentioned several times that Terrans can't tell Neosapiens apart, to the point that every Neo has to have a unique "broodmark" tattooed on his/her head in order to distinguish them. However, they all look quite different.
* On ''WesternAnimation/{{Futurama}}'', the aliens of Omicron Persei 8 take the "humans all look the same" philosophy to ludicrous extremes by not being able to tell the difference between a woman with one eye and a orangutan wearing [[WigDressAccent clothes, a wig, and an eyepatch]].



* {{Averted}} in ''WesternAnimation/AmericanDad''--when we finally see more of [[JerkAss Roger]]'s species, they still look like TheGreys but differ a lot in body type.
* ''WesternAnimation/StarWarsTheCloneWars'' plays this very strangely in-universe. Most Gungans are fairly different looking, yet Anakin and Padmé decide that Jar Jar looks enough like an incapacitated Gungan boss to pose as him for the boss's followers, whom to [[IdiotBall further complicate this]] are at this point quite annoyed at Jar Jar and the Republic in general. ''[[RefugeInAudacity And it works]]''.
* The [=LGMs=] of ''WesternAnimation/BuzzLightyearOfStarCommand'' all look identical in addition to having a HiveMind. On the flip side, one LGM called Mira "Booster" with the explanation that "you all look the same". Mira and Booster aren't even the same species; Mira is a [[GreenSkinnedSpaceBabe Blue Skinned Space Babe]], and Booster is a large red implied-to-be-reptilian being.
* Zig-zagged in ''WesternAnimation/StevenUniverse'': Gems of a single kind are actually ''[[CloneArmy supposed]]'' to all look alike, as they're created artificially and designed for specific tasks, as can been seen with the first three Rubies shown, who are identical except for [[HeartDrive gemstone]] location. Major variations in body type (like Amethyst's short height, contrast with Quartzes' intended HeroicBuild) are considered deformities/defects. However, a later group of Rubies show there are cosmetic variations small enough to ''not'' be considered deformities, like varying tones of the same color of skin. [[BeautifulSlaveGirl Pearls]] seem to have such difference deliberately in order to [[UncattyResemblance match the appearance of those they serve under]] (e.g. Yellow Diamond has a yellow Pearl, Blue Diamond has a blue Pearl).

to:

* {{Averted}} in ''WesternAnimation/AmericanDad''--when we finally see more of [[JerkAss Roger]]'s species, they still look like TheGreys ''WesternAnimation/RoughnecksStarshipTroopersChronicles'': All the characters are SerkisFolk, but differ a lot in body type.
* ''WesternAnimation/StarWarsTheCloneWars'' plays this very strangely in-universe. Most Gungans
the humanoid "Skinny" aliens are fairly all the same model in (occasionally) different looking, yet Anakin and Padmé decide that Jar Jar looks enough like an incapacitated Gungan boss to pose as him for clothes. As are the boss's followers, whom to [[IdiotBall further complicate this]] are at this point quite annoyed at Jar Jar and bugs, within a given breed. The "Skinny" Colonel T'phai uses the Republic in general. ''[[RefugeInAudacity And it works]]''.
* The [=LGMs=] of ''WesternAnimation/BuzzLightyearOfStarCommand'' all
"all humans look identical in addition to having a HiveMind. On the flip side, alike" line at one LGM called Mira "Booster" with the explanation that "you all look the same". Mira and Booster aren't even the same species; Mira is a [[GreenSkinnedSpaceBabe Blue Skinned Space Babe]], and Booster is a large red implied-to-be-reptilian being.
* Zig-zagged in ''WesternAnimation/StevenUniverse'': Gems of a single kind are actually ''[[CloneArmy supposed]]'' to all look alike, as they're created artificially and designed for specific tasks, as can been seen with the first three Rubies shown, who are identical except for [[HeartDrive gemstone]] location. Major variations in body type (like Amethyst's short height, contrast with Quartzes' intended HeroicBuild) are considered deformities/defects. However, a later group of Rubies show there are cosmetic variations small enough to ''not'' be considered deformities, like varying tones of the same color of skin. [[BeautifulSlaveGirl Pearls]] seem to have such difference deliberately in order to [[UncattyResemblance match the appearance of those they serve under]] (e.g. Yellow Diamond has a yellow Pearl, Blue Diamond has a blue Pearl).
point.



* Zig-zagged in ''WesternAnimation/StevenUniverse'': Gems of a single kind are actually ''[[CloneArmy supposed]]'' to all look alike, as they're created artificially and designed for specific tasks, as can been seen with the first three Rubies shown, who are identical except for [[HeartDrive gemstone]] location. Major variations in body type (like Amethyst's short height, contrast with Quartzes' intended HeroicBuild) are considered deformities/defects. However, a later group of Rubies show there are cosmetic variations small enough to ''not'' be considered deformities, like varying tones of the same color of skin. [[BeautifulSlaveGirl Pearls]] seem to have such difference deliberately in order to [[UncattyResemblance match the appearance of those they serve under]] (e.g. Yellow Diamond has a yellow Pearl, Blue Diamond has a blue Pearl).



[[folder:RealLife]]

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[[folder:RealLife]][[folder:Real Life]]





Added DiffLines:

16th Apr '17 8:15:01 PM nombretomado
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* ''StarWarsTheCloneWars'' plays this very strangely in-universe. Most Gungans are fairly different looking, yet Anakin and Padmé decide that Jar Jar looks enough like an incapacitated Gungan boss to pose as him for the boss's followers, whom to [[IdiotBall further complicate this]] are at this point quite annoyed at Jar Jar and the Republic in general. ''[[RefugeInAudacity And it works]]''.

to:

* ''StarWarsTheCloneWars'' ''WesternAnimation/StarWarsTheCloneWars'' plays this very strangely in-universe. Most Gungans are fairly different looking, yet Anakin and Padmé decide that Jar Jar looks enough like an incapacitated Gungan boss to pose as him for the boss's followers, whom to [[IdiotBall further complicate this]] are at this point quite annoyed at Jar Jar and the Republic in general. ''[[RefugeInAudacity And it works]]''.
16th Apr '17 3:52:51 PM nombretomado
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* ''{{Spore}}'', though earlier stages at least have "baby" versions with more exaggerated features. Civ and Space, though? All members of a given species are identical, including the outfits.

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* ''{{Spore}}'', ''VideoGame/{{Spore}}'', though earlier stages at least have "baby" versions with more exaggerated features. Civ and Space, though? All members of a given species are identical, including the outfits.
9th Jan '17 10:44:12 AM Tahaneira
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Added DiffLines:

* Exaggerated in one episode of ''WesternAnimation/SamuraiJack'' with the Chritchellites, an alien race whose members not only look the same, and dress the same, but ''sound'' the same. As in, they all have the same voice actor who inflects all their lines the exact same way. The only distinguishing feature that their leader has is that his visor is orange.
9th Jan '17 8:33:54 AM thatother1dude
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->'''Luke Rattigan''': How... do you tell each other apart?
->'''General Staal''': We say the same of humans.

to:

->'''Luke Rattigan''': How... do you tell each other apart?
->'''General
apart?\\
'''General
Staal''': We say the same of humans.


Added DiffLines:

* Zig-zagged in ''WesternAnimation/StevenUniverse'': Gems of a single kind are actually ''[[CloneArmy supposed]]'' to all look alike, as they're created artificially and designed for specific tasks, as can been seen with the first three Rubies shown, who are identical except for [[HeartDrive gemstone]] location. Major variations in body type (like Amethyst's short height, contrast with Quartzes' intended HeroicBuild) are considered deformities/defects. However, a later group of Rubies show there are cosmetic variations small enough to ''not'' be considered deformities, like varying tones of the same color of skin. [[BeautifulSlaveGirl Pearls]] seem to have such difference deliberately in order to [[UncattyResemblance match the appearance of those they serve under]] (e.g. Yellow Diamond has a yellow Pearl, Blue Diamond has a blue Pearl).
29th Dec '16 9:46:41 PM Galacton
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** This was improved a bit in ''VideoGame/TheLegendOfZeldaTwilightPrincess'' -- the Zora had two different models for standard citizens. A number of relatively important gorons got unique models as well, but the ordinary ones still all looked alike.

to:

** This was improved a bit in ''VideoGame/TheLegendOfZeldaMajorasMask'' and ''VideoGame/TheLegendOfZeldaTwilightPrincess'' -- the Zora had two different models for standard citizens. A number of relatively important gorons got unique models as well, but the ordinary ones still all looked alike.
28th Dec '16 2:53:53 PM Lloigor
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** After Sisko ends up [[EmergencyImpersonation taking the role]] [[TrickedOutTime of a 21st century]] [[YouWillBeBeethoven historical figure]], Quark fails to notice the resemblance even when it's pointed out to him, saying "All humans look alike." Made either funnier by the fact that Sisko and the man he's replacing don't look at all alike beyond both being African-American and about the same height. It's also a reference to Quark's actor playing several unrelated Ferengi characters over the course of the franchise.

to:

** After Sisko ends up [[EmergencyImpersonation taking the role]] [[TrickedOutTime of a 21st century]] [[YouWillBeBeethoven historical figure]], Quark fails to notice the resemblance even when it's pointed out to him, saying "All humans look alike." Made either even funnier by the fact that Sisko and the man he's replacing don't look at all alike beyond both being African-American and about the same height. It's also a reference to Quark's actor playing several unrelated Ferengi characters over the course of the franchise.
15th Dec '16 1:50:50 PM JoeMerl
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to:

* PlayedWith in ''Literature/{{Animorphs}}''--when [[BigBad the future Visser Three]] first manages to [[PuppeteerParasite infest]] [[GeneralRipper Alloran]], [[WideEyedIdealist Elfangor]] realizes that his subordinates won't know ''which'' Andalite he's gotten, so he contacts them and does his best "Evil Overlord" act.



* Averted in ''WesternAnimation/InvaderZim''. Irkens vary widly in looks, while still obviously being the same species.

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* Averted in ''WesternAnimation/InvaderZim''. Irkens vary widly widely in looks, while still obviously being the same species.species.
** Oddly, [[BigBadDuumvirate Tallests Red and Purple]] look identical, except for their [[ColorCodedForYourConvenience eye and armor colors]]. One fan theory is that they're twins (however that would work with a UterineReplicator, anyway).
** The same goes for the [[ProudScholarRaceGuy Vorts]] ([[ContinuitySnarl or Vortians?]]): [[RebelLeader Lard Nar]] has gray skin and "horns" (head tentacles?) that seem to be segmented, while [[ForcedIntoEvil Prisoner 777]] is purple-skinned and his horns are more curved.
* {{Averted}} in ''WesternAnimation/AmericanDad''--when we finally see more of [[JerkAss Roger]]'s species, they still look like TheGreys but differ a lot in body type.
2nd Dec '16 10:36:23 PM AtmosBlitzer
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** Da Orks have this view of humans. Ork hierarchy is based on who is da biggest, meanest Ork around. Some relatively philosophical Orks (and the bar is very low here) wonder how the human chain of command works since humans are all about the same size as each other. Some crafty Orks have noticed that da 'oomies what give da orders have more shiny bits on deir clothes. The main competing theory is dat it's all 'bout [[CommissarCap dem fancy 'ats]].

to:

** Da Orks have this view of humans. Ork hierarchy is based on who is da biggest, meanest Ork around. Some relatively philosophical Orks (and the bar is very low here) wonder how the human chain of command works since humans are all about the same size as each other. Some crafty Orks have noticed that da 'oomies what give da orders [[BlingOfWar have more shiny bits on deir clothes.clothes]]. The main competing theory is dat it's all 'bout [[CommissarCap dem fancy 'ats]].
28th Nov '16 6:49:23 PM DesertDragon
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If anyone tries to [[LampshadeHanging point this out]], an alien character may retort, "to me, all humans look the same," implying that there ''are'' differences that the untrained eye might not pick up. Alternatively, they may [[FantasticRacism accuse you of racism]]. Counterintuitively, this is one way in which HumanAliens are more realistic than the more "complicated" types.

A potential explanation is that aliens tell themselves apart by non-visual signals. Many real animals, who may or may not know each other visually, get lots of information just from scent, but this is rarely used as a device.

May sometimes also occur in Fantasy.

Interesting side note: Some evidence suggests that humans have trouble discerning differences between faces that belong to a group they are unfamiliar with. "They all look the same", therefore, has some basis in fact. This is the basis of the IdenticalLookingAsians trope. However, this effect fades with time and exposure to different individuals of said different groups. Therefore, a sheltered Westerner moving in Korea will, after initial difficulty, eventually be able to tell his neighbors apart quite well.

to:

If anyone tries to [[LampshadeHanging point this out]], an the alien character may retort, "to will most likely respond that they look nothing like their compatriots and might shoot back, "To me, all humans ''humans'' look the same," implying that there ''are'' are indeed differences that the untrained eye might not pick up. Alternatively, they may [[FantasticRacism accuse you of racism]]. Counterintuitively, this is one way in which HumanAliens are more realistic than the more "complicated" types.

A potential explanation is that aliens tell themselves apart by non-visual signals. Many real animals, who may or may not know each other visually, get lots of information just from scent, but this is rarely used as a device.

May sometimes also occur in Fantasy.

device unless the aliens are [[StarfishAliens particularly inhuman]].

Interesting side note: Some evidence suggests that humans have trouble discerning differences between faces that belong to a group they are unfamiliar with. "They all look the same", therefore, has some basis in fact. This is the basis of the IdenticalLookingAsians trope. However, this effect fades with time and exposure to different individuals of said different groups. Therefore, a sheltered Westerner moving in to Korea will, after initial difficulty, eventually be able to tell his neighbors apart quite well.
well. One can assume the same would hold true if he moved to Alpha Centauri.
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http://tvtropes.org/pmwiki/article_history.php?article=Main.DittoAliens