Planet of Hats



"Astronaut: Navigation! Where are we? Kevin Murphy: Well we're over the Planet of the Apes, approaching The Phantom Planet, right near the Planet of the Vampires which is right across from the Prehistoric Planet."

- Riff Trax Planet of the Dinosaurs

On their Wagon Train to the Stars, our intrepid heroes come across a planet with a single defining characteristic. Everybody is a Robot, or a gangster, or a Proud Warrior Race Guy, or wearing a hat. To some degree, this is unavoidable; you only have so much screen time or page space to develop and explore a culture. But it's still very easily and often overdone. For maximum typing, the characters can also be physically uniform, as in People of Hair Color.

Earth itself is sometimes portrayed as a Planet Of Hats. The defining human characteristic is often "pluck" or "sheer cussedness" and sometimes even "diversity", though "bastardry" and "stupidity" are common in more misanthropic works.

Just for comparison, Earth has seven continents, hosting just under two hundred states, with an estimated five thousand ethnicities, with even more thousands of different languages and their varied dialects. There is no reason to suspect that alien life forms would be any different, but in media they are nowhere near as diverse as one might expect. Also, in the universe that isn't completely cardboard, placing too much of your eggs in a single basket is prone to turning into a strategical disadvantage. Which is why the species that aren't endemic remain diverse in the first place, of course: this ensures necessary minimum of adaptability.

Writers love to use the hat planet to represent controversial issues in society (or less often other "hot" topics of various nature) whenever they can. This way the characters can take a thinly disguised public stand on an issue that the network execs would otherwise consider too taboo to openly discuss. We can't have our heroes discussing euthanasia, but should they stumble across a Planet Of Hats where everyone who gets sick is put to death, then it's okay. Eventually the plots will run out with an entire race of identical people so one or more of the species will have their hat fall off, declaring My Species Doth Protest Too Much. Alternately, the show may explore why Klingon Scientists Get No Respect.

The Planet of Hats may also be an unintended result of a Character Exaggeration type Plot Tumor or Flanderization applied to an entire race, when the audience had previously only seen a single representative who the writers now wish to market. For cases where a planetary hat is extrapolated retroactively from a single character, see Planet of Copyhats. When done deliberately, hats can be flaunted by "tipping" them all the time ("Have I Mentioned I Am a Dwarf Today?") - or can be tipped lazily, in which case a character acts in the recognizable one-note caricature way for one scene, but once the hat is presented, doesn't feel need to touch it any more (it allows to combine the annoying sides of hats and "everyone is the same", while neatly demonstrating the writer is unable or unwilling to maintain consistency).

In an example of The Coconut Effect, the concept of the Planet of Hats has become so ingrained into popular culture that whenever an alien race is portrayed as not being uniform, identical, and homogeneous it typically results in complaints.

Occasionally semi-Justified Trope in settings with relatively convenient space travel. Many nations agree to use a single language (usually English) when they must operate in a multinational group. It is also reasonable to expect planetary colonists to be culturally and linguistically uniform.

If the Hat involves the Idiot Ball, you end up with an Idiot Plot.

Possibly Truth in Television, with people saying that all mice like cheese, all dogs hate cats, all Humans Are the Real Monsters/Humans Are Special, etc.

Compare: Gang of Hats. Contrast: Multicultural Alien Planet. See also Rubber Forehead Aliens, Intelligent Gerbil, Scary Dogmatic Aliens. May result because Apathy Killed the Cat. If the planet's hat is being evil, it's an example of Exclusively Evil. Serious Business is what happens when the show's setting gets a hat. This trope in itself is a good example of Sci-Fi Writers Have No Sense of Scale. See Single Biome Planet when the planet is unnaturally uniform physically. One Product Planet is a subtrope, but focuses on economics rather than culture.

Has nothing to do with a certain war-themed hat simulator.

Anime & Manga

 * Galaxy Express 999 is the ur-example in Anime/Manga. We have planets where everyone's a beggar, fat, angry, lawless, sad, glows in the dark and so on.
 * Cowboy Bebop
 * In the episode "Mushroom Samba" (itself the name of another trope), the crew of the Bebop finds that the terraformed moon Io has developed a culture apparently inspired by 1970s Blaxploitation films.
 * Bebop used the different planets as either Fantasy Counterpart Culture or a planet of hats. Venus was US-run, while Callisto was Russian, the Jovians were mostly European, and Earth was SE Asia.
 * In Kino's Journey, each individual country is a separate Planet of Hats, such as a country devoted to nothing else but the construction of a tower or is inhabited by people who do nothing but secretarial work. Most amusing is the town who doesn't have a hat, and is trying desperately to get one. They show off some different 'ancient tradition' to every traveler to come by. Kino remarks that this is their hat.
 * In Tsubasa Reservoir Chronicle by CLAMP, the characters must visit different worlds in search of Princess Sakura's feathers. Roughly every world they visit will be a Planet of Hats (although some of them aren't as easy to notice).
 * Vandread:
 * The two main planets are Taraak (the planet of men), a barren world where the locals are concerned with things like uniforms, practicality, appearing manly, and eating nutrition pellets (think hamster food), and Mejere (the planet of women), which looks like Las Vegas and has locals concerned with appearing nice, who eat foods that are basically dessert.
 * There's a darker side to this as well, as every inhabited planet was marked by a unique physical trait
 * The three Invading Countries (actually planets) from the second season of Magic Knight Rayearth. Autozam is all about the mental power-based technology, Fahren is a thinly-veiled Fantasy Counterpart Culture for Imperial China, and Chizeta's culture is entirely Arabian Nights-based.

Comic Books

 * Top Ten (by comic book genius Alan Moore)
 * The comic takes place in a city where everyone—the cops, the bus drivers, the bums on the street—is a Superhero or some other "science hero" trope. This does have lots of room within it, however, as the titular team has a talking dog in an exoskeleton, the world's only Yazidi superhero, and a sarcastic Mazinger Z, amongst others. Did we mention it's a Police Procedural?
 * It's eventually revealed that the "10 Precinct" (hence the "10" in "Top 10") is so called because it's the 10th in a series of alternate dimensions. Each dimension has its own precinct, and its own hat. The 10th is superheroes; other precincts include robot dinosaurs and Romans.
 * DC Comics has a lot of Hat Planets:
 * In the Legion of Super-Heroes, most planets are like this, with their "hat" being related to their super-power; Naltor, planet of precogs, Titan, planet of telepaths, Colu, planet of geniuses, et cetera.
 * They also have two characters from Winath who (at least some of the time) share a superpower, but that's not Winath's hat—twinning is normal there and in some media, the whole planet is devoted to farming.
 * Ultra Boy comes from Rimbor, which is The Planet Of Dark Alleys and Biker Gangs.
 * And of course, the planet Bizmol, whose hat is eating things.
 * This is all justified in Legion of Super-Heroes Annual #2, which shows that all of these planets were specifically colonized a thousand years earlier by advanced humans with similar power-sets after Invasion! happened.
 * Also occurred at least once in a Superman comic in which Jimmy Olsen is transported to the Planet of the Capes. Seriously. This comic came out in the wake of the Planet of the Apes film, so they were probably going for the pun.
 * Lobo occasionally encounters hat planets, such as planets made entirely from highway (in the Lobo comic series), a vacation planet (The Last Czarnian mini-series), and a planet populated by religious fundamentalists who immediately explode upon contact with any infidels by triggering an apparently inherited power through pushing down their head onto their shoulder.
 * The Hat of the Daxamites is violent xenophobia. Daxamites who don't try to kill aliens on sight are considered outcasts, and in one case was brainwashed by his own parents so that he would be a xenophobe. And just to complicate matters for aliens, they're on offshoot of Kryptonians, who win the Superpower Lottery when exposed to a yellow sun.
 * Blackest Night explains that Earth's Hat is in fact that it doesn't wear a Hat; Earth is the most diverse planet in the universe. This is due to it (Though Lex Luthor argues that he should get the Orange Lantern of Greed because Earth is all about consumerism and acquiring stuff.)
 * The Polish comic Tytus Romek IA Tomek has an issue where the protagonists visit several "Nonsense Islands", each of which is a classic Island Of Hats where everyone is an athlete, a bureaucrat, etc.
 * In one Mickey Mouse detective story Mickey and Goofy are employed by aliens from a planet where everyone is a thief - its perfectly legal to steal, people are suspicious of someone who doesn't, and their leader got his position because he is such a great crook. (No, not by cheating. People voted for him because he was such a dishonest man.) They need an outsider because they are temporarily hosting an artifact shared with other, friendly planets, and they don't trust anyone on their own planet - with good reason.
 * The Mojoverse is an entire Dimension of Hats organized around television. Whoever has the best ratings is the Dimension Lord.
 * In Invincible, all of the male Viltrumites have to grow moustaches.

Film

 * Star Wars:
 * Not quite as obvious, but quite present: all Twi'lek girls are exotic dancers, all Hutts are gangsters, all Bothans are spies, all Ithorians are pacifists, etc. (See also Single Biome Planet). Of course, almost any species, Hatted or not, may show up as a Jedi (even a Hutt or two), and there are numerous other exceptions. In recent years, some writers grew tired of these stigmas and began lampshading and subverting them - for example, showing a couple of Ithorian criminals in one of the Knights of the Old Republic comics and claiming that Ithorians "stay all peaceful and polite" by "throwing guys like these out". In many cases, the hats in Star Wars seem to have been placed by the fans or EU writers. The films indicate that at the very least, nearly every species in the galaxy has senators. Gungan society shows a diversity, featuring overbearing rulers, knuckleheaded outcasts, and courageous soldiers.
 * Knights of the Old Republic lampshades the sharing of hats (Mercenary/Bounty Hunters) between three races at one point, with one of each race pointing out the differences between them.
 * Also in KOTOR, one twi'lek on Taris was an entrepreneur in the upper city who commented that her business doesn't do as well as it should because people there expected her to wear the dancer hat.
 * KOTOR does, however, play the Wookiee life-debt hat absolutely dead straight with Zaalbar, and Hanharr has one but is filtering it through his Ax Crazy Chaotic Evil psychosis into an obsessive desire to kill the object of said life debt.
 * The Expanded Universe also subverts/averts the Hats, having Twi'leks reveal that they have a unique culture, complete with their own Proud Warrior Sect. Not to mention a Twi'lek who put the 'slave dancer' phase far behind her, and a Bothan who is surprisingly honest. At least one book mentions that Jabba the Hutt was a common smuggler before being a Mafia Don, which is almost the Hutt's hat.
 * The Expanded Universe has even given us a Hutt Chancellor of the Republic (Blotus), who is noted to have been a fair, honest, popular leader.
 * There's also been somewhere (in The Planet of Twilight) a Hutt Jedi called Beldorian or Beldorion (darksider, but still greatly untypical for a Hutt).
 * One of the novels, Starfighters of Adumar, takes place on a (human-occupied) planet whose Hat seems to be reverence for starfighter pilots combined with blood sport and melodrama. In time we get to see that these traits are more a specific country's Hat, and intelligent people from said country can be made to doubt their convictions with relative ease.
 * Interestingly, some of the human planets get Hats too. Especially Corellians (the planet of Never Tell Me the Odds), Alderaanians (philosophical pacifists), and Mandalorians (planet of violent badass mercenaries). Corellia actually has multiple hats. For one, they are the planet of the Ace Pilot and the Badass Space Navy—Han Solo, Soontir Fel, and Wedge Antilles are all renowned for this. More negatively, however, they are the Commander Contrarian. It doesn't matter what they're rebelling against, they simply rebel and bristle under galactic authority.
 * Tatooinians are all excellent pilots. Rogue Squadron actually has a sixteen-year-old Tatooinian as Rogue Five. Lampshaded by the fact that when he wants to ask Corran a question about inter-species relationships, Corran thinks he doesn't know what sex is.
 * Every member of Yoda's species is a wise Jedi master; all four of them.
 * Almost all examples from the Star Wars EU are cases of Flanderization: Authors will take the one mention a race or species has in the movies and expand it to be true for all members of that race or species. Leia says Alderaan has no weapons? They're all pacifists. Han says to never tell him the odds? All Corellians hate odds. Many Bothans died to get the death star plans? All Bothans are spies.
 * In Mom and Dad Save The World, the title characters get kidnapped by (and save the world from) an Evil Overlord from a planet where the hat is... mind-boggling amounts of stupidity. As an example, one of the deadliest weapons on this world is called the light grenade, which instantly disintegrates whoever picks it up. And how does this decimate an entire army? It says "Pick Me Up".
 * The American Astronaut has the Venusians, which are all Southern Belle and the people from Jupiter who are all miners, the later is justified since it's implied they are hired from all over the galaxy.
 * Inverted in Critters, in which the alien prison-warden and the data he provides to the bounty hunters refer to Earth's own civilization as a culture.

Literature

 * Nations characterized by a single trait have been a staple of travelogue-style fiction for centuries. The academics-obsessed people of Laputa in Gullivers Travels are a good example.
 * Older Than Feudalism: This happens in the ancient Greek tales of Hyperborea, Atlantis, and other allegorically intended foreign lands.
 * The Idirans of Iain Banks' Culture books are a Proud Warrior Race of Scary Dogmatic Aliens. Culture Orbitals tend to acquire hats due to the nature of the Culture as a society of absolute leisure with high population mobility. Masaq orbital is full of extreme sports (and is so dedicated to risk it's deliberately orbiting an unstable star), whilst Chiark is the destination of choice for games of skill and chance.
 * The Wheel of Time:
 * The world is comprised of hat-wearing nations and peoples. Two Rivers folk are all brave and stubborn, Cairhienin are all short and concerned with political intrigue, Arad Domani women are all sluts, women in the various Ajahs of the Aes Sedai almost always act alike, etc. Few cultures in the series are shown to have individuals who behave contrary to their cultural stereotypes.
 * Membership in a Ajah is a matter of outlook and self-chosen duties. It's not surprising that each Ajah's members will have similar outlooks and personalities.
 * The Myrddraal, Black Cloaked Elite Mooks and Mook Lieutenants, are said to be essentially an entire race of the same person replicated over and over again. However, the Myrddraal are an artificial race and all behave the same because they're wired to.
 * Janet Kagan's Hellspark subverts this. It's a multiple-culture universe where each of the cultures has a single quirk—one considers feet obscene, one duels at the drop of a hat, one considers telling the truth (speaking accurately) a basic requirement, etc... and each of these people are individuals who incorporate their cultural quirk into their individuality.
 * Subverted in the works of Bruce Coville. In particular one book in the My Teacher Is an Alien series has a kid helping aliens on Earth and taking them to a swamp at one point. One of the aliens comments that the swamp reminds him of his home; when the boy asks if he came from a swamp planet, the alien sarcastically asks if he comes from a swamp planet. Turns out he just happened to be from a swamp.
 * Larry Niven's Known Space deals with this trope. Pierson's Puppeteers are cowards to the point that only insane specimens are willing to deal with other species (but as their name implies, their real hat is Manipulative Bastardry. ) Kzinti are all Proud Warrior Race Guys, and humans may or may not have a trait for genetic luck. Humans are also apparently obsessed with sex; in Ringworld, the puppeteer Nessus says to Louis and Teela, "No known species copulates as often as you do", and The Ringworld Engineers:
 * The series features many species with the same ancestry as humans whose politics revolves around ritual inter-species sex. Further, at various points in the series, Niven will go into the details of how these hats are worn, via the various mechanism that produced the human traits, and the evolutionary imperatives that effect the ongoing makeup of the various species. At one point in Ringworld, a kzin sets a human off on a logical analysis of the instability of Kzinti aggression in the context of an enemy race that they can't easily beat. Whether this is a Lampshade Hanging or a justification is left as an exercise for the reader.
 * There are plenty of exceptions of course. The Kzinti have the least, but that's justified with them genetically engineering themselves into a 'heroic' race. They were at best bronze age technologically when taken by another species to use as troops. They rebelled and overthrew their masters, using their technology with most of them not truly understanding it. They tinkered a hell of a lot with their own genome, with one of the offshoots making their women non-sentient and playing with their sex drives and aggression. The Puppeteers don't even have sex as we understand it, reproducing with a female of a separate species that actually gestates the young until the child eats its way out...
 * Pak Protectors wear the Villain Sue hat, and human Protectors wear the Canon Sue hat. To be transformed into a Protector is to become the ultimate soldier, strategist, scientist and engineer, able to solve almost any problem and beat almost any opponent.
 * Justified in The Little Prince since every planet is inhabited by exactly one person.
 * Animorphs mostly averted it; alien cultures would often emphasize certain concepts or things (Andalites with honor, Hork-Bajir with trees, etc.), but all were fairly complex; even the Yeerks and Taxxons weren't Exclusively Evil. Book 26, however, had the Iskoort, whose Hat was guilds—there was (in order of introduction) a Trader Guild, a Criminal Guild, a Warmaker Guild (though it quickly becomes clear the Iskoort were not cut out for combat), a Servant Guild, a Worker Guild, a Superstition and Magic Guild, a Shopper Guild, and even a "News, Gossip, and Speculation Guild." And all the Traders were the most annoying salesmen imaginable. (The others were annoying, too, but they ran into Traders the most.)
 * From The Hitchhikers Guide to The Galaxy, the Vogons are a race of Obstructive Bureaucrats. Their correspondingly shallow personalities and total lack of creativity make them the third worst poets in the universe.
 * This trope dates back to at least The Skylark of Space, the very first Space Opera. It was taken to such an extreme that the heroes would cheerfully commit genocide on species they disapproved of, rather than try to change them.
 * In the comedy science fiction stories about the Hoka written by Poul Anderson and Gordon R. Dickson, the Hokas' "hat" is that they are entranced by fiction. Give them a story and they will start to live it out, believing (or at least acting) as if they are in it. They have whole cities based on various periods of human history, with Ancient Rome, Victorian England, American Wild West and other places. One of them believes he is Napoleon and has an entire city of Hokas willing to follow him as leader of "France". Actually, a better way of saying it is that their hat is following tropes, as they tend to act out the trope more than reality. Luckily, they are non-violent, so they tend to just fake the wars and other violent parts.
 * The trope also occurs in Gordon R. Dickson's Childe Cycle, better known as the Dorsai series. Humanity has separated in various splinter cultures who specialize in one attribute. The Dorsai focus on courage and honor. Newton, Cassdia, and Venus are hard science cultures. Ste. Marie is a colony of Catholic farmers. Freiland is known for its bureaucracy. Coby are known for its miners. The Exotics focus on philosophy. The Friendlies focus on religion. The trope is justified in the larger frame of the Cycle.
 * The alternate worlds or "planes" in Changing Planes by Ursula K. Le Guin are often like this; each one features a more-or-less humanoid alien race with a special ability, psychological/biological quirk, or universal tradition—such as sharing dreams, seasonal migrations, near-constant anger, becoming silent at adulthood, and extreme devotion to apparently meaningless architectural projects.
 * Ms. Le Guin, in The Left Hand of Darkness, averted this on a cultural level (the Orgota and the Karhiders have different languages, dominant "religions", and social systems), forestalling the Single Culture Planet that seems to be a staple of SF. However, on despite a couple of small nods in the direction of aversion on a physically ethnic level (mention of the bearded tribes of Perunter, for example), she portrays Gethenians as much of a muchness physically, all being short, stocky, and of a narrow range of brown hues.
 * The Belgariad series of novels by David Eddings:
 * Each of the nations of the West has its own hat. To a first approximation, based on the characters encountered: All Sendars are farmers, all Drasnians are spies, all Tolnedrans are merchants, all Chereks are Viking warriors, and all Nyssans are drug-addicted poisoners.
 * Most of the 'hats' are actually fantasy archetypes based on Earth cultures—the Chereks are Vikings Up to Eleven, the Algars are the Mongols likewise, the Drasnians appear to be a Renaissance Italy stereotype transplanted into a different geographical setting, the Tolnedrans are based on the Roman Empire (hence both their mercantile aspect and their obsessive road-building and disciplined legions), the Arends are medieval high chivalry myths taken to the point of self-parody, etc. The unflappable demeanour, their courtesy, and the general obsession with propriety of the Sendars seem to be more English than anything.
 * The Eastern nations started out as pretty hatty. But then, they were under the control of an insane god for millenia. Eddings recycles revisits recycles those themes in the Elenium and Tamuli novels: All Styrics are self-pitying magicians, all Atans are warriors, All Tamuli are polite to a fault, etc.
 * The tribes of Angarak originally were the CASTES of Angarak, and Torak mistook their differences for tribal rather than professional distinctions after being away doing god-stuff for a couple thousand years.
 * In the novel Design for Great-Day by Alan Dean Foster and Eric Frank Russel, a spiderlike species is mentioned whose hat is... hats. Nice ones.
 * Both used and averted in The Edge Chronicles. All of the Slaughterers are hunters and butchers, all of the shrykes are slave-trading warriors, and all of the trolls are lumberjacks. This even extends to occupations: the Leaguesmen are corrupt, the Sky-Scholars are evil, and the Earth-Scholars and Sky Pirates are good. However, oakelves, goblins, waifs, and (of course) humans fourthlings can be anything, and quarter-masters are either traitorous or fiercely loyal (sort-of hat).
 * In L. Ron Hubbard's Battlefield Earth, the Selachee, a race of sharks who have feet, can "live anywhere, breathe any atmosphere and eat anything," and while they did have Selachee who are engineers and other professions, their planet's exclusive profession is banking.
 * Several races in The Chronicles of Narnia, such as the Dufflepuds, who play Captain Obvious with such astute observations as water is powerfully wet, and the Marsh-wiggles, an entire race of Eeyores.
 * In Alan Dean Foster's series The Damned, all of humanity wears the Blood Knight hat once an interstellar war lands in our laps. And it's a good thing, too, because every other species in these novels either wear the Programmed For Pacifism hat or the Reluctant Clumsy Warrior hat, and being good at killing things is our only hope to survive in the face of technological superiority. Well... that and being immune to telepathy. Humans are the only species that doesn't have a single, unified culture, because we're the only ones who're such bastards that we can't even get along with members of our own species.
 * Lois McMaster Bujold's Barrayar books are made of this trope. The Beta Colony wears the "uber tolerant libertine" hat. The Jackson's Whole wears the "Wretched Hive" hat. Cetaganda wears The Empire hat. And the titular Barrayar wears the Proud Warrior Race Ruritania hat.
 * Tanya Huff's Confederation of Valor series has the Taykans and the Krai whose hats are sex and food respectively.
 * John Varley's short story "The Barbie Murders" features a cult of humans nicknamed "The Barbies" who are obsessed with conformity. They have each been modified to look and sound identical, down to the last tiny detail. They have no names or personal identities, and each takes responsibility for the actions of all the rest. This makes finding a murderer in their midst rather trying.
 * Chronicles of Thomas Covenant
 * The Haruchai are a race of stoic proud warriors. The Insequent are a race who Walk the Earth in search of knowledge. The Elohim wear an Omniscient Morality License hat. All the Ramen (people from the Plains of Ra, not noodles) care about are their horses. The Stonedownors are obsessed with stone while their cousins the Woodhelvins are obsessed with trees.
 * And on the evil side of things, the Cavewights are all Axe Crazy mooks, the ur-viles are Enigmatic Minion sorcerers, and the Croyel are parasites who offer faustian bargains. Ravers could also be said to have the hat of nature-hating omnicidal jerkasses, but this is justified by there being only three of them, and the fact that they work directly for the God of Evil.
 * Ender's Game has planets that were colonized by a single religion or country, to encourage diversity of humans among the stars.
 * Saga of the Exiles similarly mentions worlds being assigned to individual peoples for colonisation; there is even a reference to races with more "vigour" being given more planets.
 * Jerry Pournelle's CoDominium is similar for a justified reason; colonies are expensive, and require sponsors who obviously choose who populate them. America and Russia have filled the galaxy with clones of themselves, and every industrial power has at least one colony; all are meant to be examples of the superiority of their given culture. Religious and political nutcases with sufficient funds have attempted to do the same, but are often subject to the titular Amerusski Pact dumping criminals on them, meaning that almost every planet that isn't populated by Hats is a Crapsack World.
 * Walter Moers applies the principle to several cities in his Zamonia novels, most notably Bookholm (everything revolves around books) and Sledwaya (everything revolves around illness)
 * This is a common theme in Robert Asprin's MYTH series, with the characteristic of residents often being puns on the name of their "dimension." For example, residents of Deva (Deveels) are all aggressive merchants, while male residents of Trollia are trolls and female residents, trollops.
 * In the To The Stars trilogy by Harry Harrison, EarthGov has not only terraformed Single Biome Planets, they've also created a unique culture for each in order to maximise their control. For instance the agricultural planet the protagonist has been exiled to in "Wheelworld" is populated entirely by peasants and mechanics, ruled by a group of autocratic Familys.
 * In old science-fiction novel Star Surgeon by Alan E. Nourse, Humans have the hat of being doctors, to the point that Earth is called "Hospital Earth". Apparently nobody else ever really got into the whole "cut people open to make them better" thing. (At the time it was written, open heart surgery was a new, exciting thing.)
 * In Pandora's Planet, the Alien Invaders are dull and gullible enough compared to humans that once we start going out and proselytizing they become more convinced than the proselytizers. A whole planet briefly bans everything artificial. Mention is made of a low-gravity world colonized expressly for the purpose of horse racing.
 * E.T.: The Book of the Green Planet, the sequel novel to ET the Extraterrestrial, implies that all the members of E.T.'s unnamed species are botanists, since they can all communicate telepathically with plants.
 * In Stephen Baxter's Manifold Space, humans are the only species able to devote themselves entirely to an idea (i.e have faith), which becomes important at the end of the book when
 * While many planets in Honor Harrington are interesting, multi-cultural places, others are outright Planet of Hats type places:
 * Montana, on which everyone acts like stereotypical Montanans, which is lampshaded by one of the Montanans when he explains that his ancestors fell in love with an ideal, regardless of whether that ideal ever actually existed.
 * Grayson is a planet of stubborn traditionalists, even those who want to reform the society want to do so to make it more like Grayson and when new ideas or technology are introduced from off-world they almost inevitably improve it first to make it a Grayson advancement. Furthermore much of their mindset is infectious so even offworlders start acting Grayson in time.
 * Each of the different realms in the Shadowleague books has its own hat: Callisoria, for example, is the land where everyone blindly follows the Corrupt Church, and Ghariad is the land full of humanoid monsters who drink human blood.
 * Lonely Werewolf Girl has Fashion being the hat of a race of Fire-Demons.
 * In The Demon Princes, there's Sarkoy, the Planet of Poisoners; and Methel, the Planet of Snobs. This is partly explained by the fact that Methel is actually owned by socially elite caste, who take steps to keep others out.
 * In The Witches of Karres by James H. Schmitz, Karres is the Planet of Witches; Uldune is a world-sized City of Spies.
 * Another example of this is in Stephenie Meyer's book "The Host" which features a horde of peace loving aliens which invade earth and take over the body of almost everyone who lives there. This is used (apparently) deliberately as an excuse for the aliens, who hate violence, to bodysnatch the human race, as because all of them are so similar in their views and personality, they do not understand the diversity in human morality, and assume all of us are evil.
 * Garth Nix's Old Kingdom series isn't too bad about this, for a fantasy story—Ancelstierre's hat is being early 20th century England, and the Old Kingdom's hat is being a fantasy country with a distinctive magic system and a serious zombie problem. Considerable variation within. And then in Abhorsen we get the Southerlings, refugees from a war in the South whose real purpose is to be killed by the Big Bad and turned into its zombie slaves. They barely say a word. They are identified by their blue hats. Repeatedly.
 * Presumably Nix wanted a cultural trait to identify the doomed-people-and-zombies with, since a phenotypic one would be like marking out whatever real race has that characteristic as Cannon Fodder and/or things to run away from. And since particular hats have frequently been the intentional markers of communities throughout history (most of Eurasia has for extended periods viewed the lack of a hat as indecent) blue headwear was a solid call.
 * The different colonist habitats in Slowtrain To Arcturus each function as a planet of hats. Justified in that each of the habitats was purchased by a group which wished to leave Earth and selected other colonists with similar interests. The particular hats are:
 * Aryan Freedom: Those Wacky Nazis
 * New Eden: Space Amish
 * Matriarchy of Diana: Lady Land
 * U'Thanai: Proud Warrior Race Guy and Noble Space Savage
 * Icarus Cooperative: Extreme Sports Enthusiasts
 * The Workers Paradise: People's Republic of Tyranny
 * A Song of Ice and Fire features several peoples that take one particular thing, usually an important resource or terrain feature, and make it the absolute center of their culture, shoehorning it into their language's figures of speech wherever possible:
 * The Dothraki: horses
 * The Lamb-men: sheep
 * The Vale: heights
 * The Iron Islands: iron
 * Braavos: water
 * Asshai (and the Targaryens): fire

Live Action TV

 * The Star Trek series are actually the prime examples of this trope, nearly every species having one defining trait. This was often subverted in the Expanded Universe, and occasionally in-show.
 * "A Piece of the Action" is interesting because the culture's true hat was mimicking others—their entire society had been built around a book about 1920s gangsters in Chicago. In the comics, after being visited by the Enterprise they experienced a cultural revolution and began dressing like Kirk and co.
 * The Vulcans are all logic all the time.
 * The Klingons are all war all the time. (They'd tell you their true hat is honor, but that's not what you get in practice, to protagonist Klingon Worf's disillusionment.) The Orcs from World of Warcraft are accused of being this, but with the exception of Worf in the Klingons' case, the Orcs are usually slightly more multidimensional.
 * Moq'bara is the martial art practiced by Klingons everywhere, because while a peaceful society like the Federation will have hundreds of styles ranging from kung fu to boxing, a warrior culture will clearly only have one.
 * In the Original Series the Romulans are a Proud Warrior Race—or Space Romans (with home planets named Romulus and Remus) -- but TNG and Deep Space Nine had an alternate interpretation: they are all intrigue all the time
 * The Ferengi are all profit all the time, plus misogyny. Culturally, money is sort of their state religion. Ferengi tourist sites on their homeworld include the Great Marketplace and their stock exchange, and they consider any remotely non-capitalist actions (including things like giving workers holidays and allowing them to form unions) either incredibly distasteful or crimes worthy of being shunned from being allowed to do business with any Ferengi for. As for the misogyny: It's as though nobody has ever made the argument that allowing half of their population to earn money and buy things will be an economic boost.
 * The Cardassians are all service to the state all the time, in that Cardassians will always claim that whatever it is they're doing, it's for the good of Cardassia. By virtue of being the focus of Deep Space Nine (along with the Bajorans), we get a very rounded view of life within the Deadly Decadent Court of Cardassia. A significant number of Cardassians are all Magnificent Bastardry all the time because of this, while others are far more straightforward examples. Some, like Garak, are both. One guy even tried to shame his government into admitting the atrocities the Cardassians had committed against the Bajoran people during their occupation of the Bajoran homeworld...for the good of Cardassia.
 * Also from Deep Space Nine were Odo's people, The Founders, whose hat was essentially "order", both small and big scale. They were given a reason for it, but were pretty forceful in making others put the hat on too.
 * Deep Space Nine has The Mirror Universe of the Cheesy Cartoon Characters...
 * Tellarites "do not argue for reasons, they simply argue." Spoken by a member of a species that apparently doesn't have such great relations with the Tellarites, but eventually proven true once we get to meet more. Negotiations are often opened by trading insults.
 * Conformity as a Hat has been done a few times, most notably with the Borg. With the introduction of Seven of Nine, "efficiency" was added.
 * Cheron in "Let That Be Your Last Battlefield" is (or rather, was), supposedly, a planet of racists. (They are black on the left side. We are black on the right side!)
 * Star Trek: The Next Generation brought in the Risians to wear the sex hat. Risa's hat is more accurately hospitality. "All that is ours is yours". Free and open sexuality is just a part of that; a part most aliens fixate on.
 * Supposedly the El-Aurian hat is "listening", but we've only met three members of the species... one (Guinan) specializes in listening, but one was a con man (in a Deep Space Nine episode which lampshaded the "listening hat" thing by having a fellow prisoner try to come up to the con man and tell him his life story in jail, whereupon he responded by begging the guards to take the guy away from him) and one was a mad scientist. In that sense the El-Aurians have managed to subvert the usual Trekkian "one hat per species" rule. Although Guinan literally does wear some awesome hats.
 * Taking place clear across the galaxy from these others, Star Trek: Voyager has its own hat species, such as the Kazon (society revolves around infighting between the various rival groups), the Vidiians (society revolves around medicine and organ-stealing due to the disease they have), the Hirogen (society revolves around "the hunt"), and Species 8472 (society revolves around eradicating lesser, "weak" species.)
 * Want to do a Green Aesop in Voyager? Then it's time to wheel out the Malon, whose hat is, of all things, pollution. They're saved from being an entire race of Captain Planet and the Planeteers villains because they're not polluting just for the sake of it—it's simply that they've never bothered to invent "clean" technologies as long as the waste is transported a long way from the homeworld.
 * Humans don't quite have a Hat, and—especially in the Gene Roddenberry days—were sort of the anti-hat: Having finally gotten it right, humanity's made a perfect future for itself, finally free of the undesirable qualities that some of the other species represent. Then again, being "perfect" eventually became humanity's hat, until the Deep Space Nine era, where that hat was rather rudely yanked off, set on fire, and thrown into a wood chipper. Alternatively, from the perspective of the other species, it would seem that condescension became humanity's hat. Every non-Federation character seemed to find humans in general and Star Fleet officers in particular extremely patronizing.
 * On Star Trek: Enterprise, Vulcan Ambassador Soval complains at length about humanity's lack of a Hat: "Of all the species we've made contact with, yours is the only one we can't define. [...] One moment you're as driven by your emotions as Klingons, and the next, you confound us by suddenly embracing logic!" He goes on to explain that pre-logic Vulcans were similarly hatless in a way that now scares them.
 * In the original pilot, the Human Hat was a resistance to authority. Even good authority.
 * Knowledge/Exploration could be the human hat. Most of the other races explored the galaxy, but for profit, power or domination.
 * The modern novels often suggest that humanity's hat is creativity. In one novel, a Tellarite says creativity defines humans as logic defines Vulcans. This creativity expresses itself in various ways, including the formation of a vast variety of cultures, religions and nations that outnumber those of most other species, making the apparent lack of a hat actually a part of our hat.
 * Another possible hat for humans is freedom. Several episodes have someone telling an alien how humans hate imprisonment (even if it is paradise) or how they require a challenge to truly live.
 * In Star Trek: Enterprise, Archer (however unintentionally) proposes that humanity's hat is diplomacy; humans know when it's time to put aside their differences and look at the bigger picture. This is perhaps the primary reason every other galactic power is an empire of some sort, while the Federation is a coalition.
 * The Expanded Universe novel How Much for Just the Planet?, by John M. Ford, features a world whose hat is comedy routines.
 * An alien on Voyager once used this trope to describe different species—his own species' hat was an inherent understanding of languages, while humanity's was "a great generosity of spirit." However,.
 * The episode "Patterns of Force" has the Nazi Planet. (Not their native hat, it was imported by a Well-Intentioned Extremist historian from Earth).
 * The Yridians are all information dealers.
 * The Redeemers are all religious fanatics.
 * As noted above, there are actually several episodes with planets whose inhabitants made their hat by copying something from Earth—gangsters, Nazis, ancient Greeks...
 * A Star Trek spinoff novel lampshaded this one by explaining that on most planets, war and oppression and genocide have had a homogenizing effect on sentient species. Humans figured out how to live together peacefully before that happened to them. As a result, Earth has a far greater range of cultural and ethnic diversity than can be found on most other planets.
 * While the Bajorans are one of the most varied races in Star Trek, they do have two hats, they're all deeply religious (but not fanatics) and they're mostly ex-freedom fighters. In general, the ones in the religious hierarchy have a calm spirituality (even Kai Winn is good at faking it) and the rest are quick to anger.
 * The Pakleds all act like they have serious developmental problems, coming across as mentally and socially retarded. But in large part, it is an act. And in the words of Data's... actually stunted brother, "they are fat".
 * In "The Mark of Gideon," Kirk was kidnapped by a race whose universal pro-life tendencies had lead to horrible overpopulation, to the point that they tried to start a pandemic with germs from Kirk (who had been exposed to meningitis in the past).
 * In Babylon 5, the Narn start off as the Proud Warrior Race, the Minbari as Elves, the Vorlons as Mysterious Elders, and the Centauri as the declining Roman Empire. The Narn become Warrior Poets, the Minbari lose all hats due to a civil war, and the Vorlons gain (or rather, reveal) a Law hat. The Shadows also happen to gain the Chaos hat, while the Drazi steal the Proud Warrior Race. The uniformity of the alien cultures compared to humanity is lampshaded in the episode "The Parliament of Dreams," where each of the major races puts on a display of their global religion, while Sinclair arranges dozens upon dozens of people to represent humanity's multitudes of religions (even including a nonreligious atheist). Ultimately humanity's "hat" is explicitly defined (by Delenn) as community-building—humans automatically and unthinkingly weave together disparate groups into communities. The Narns also have more than one religion, but weren't seen to put on a demonstration in "The Parliament of Dreams".
 * The hats come off slightly as the series goes on. Londo points out that, to be a success in Centauri society, you have to be a schemer; there are plenty who don't, it's just that their families dwindle to insignificance. Delenn points out that both the religious and warrior castes have been ignoring the worker caste since Valen founded the Grey Council, and since they are fairly isolationist, we usually only get to see those who are on government business, who tend to be religious caste (possibly this is just because Delenn is religious), the military (and hence the warrior caste, although Londo does tell Earth Gov that this is not quite the same thing), or the Rangers, who are an elite undercover military force, with the obvious hats.
 * The Minbari hat is tradition, whichever caste it comes from. This certainly applies to both Delenn and Lennier, though sometimes we get to see Beneath the Mask.
 * The Abbai's hat is a focus on "community", the Brakiri's hat is business (more corporate culture as an ideal, rather than a Star Trek Ferengi-style "profit," though of course that is their ultimate goal). The Drazi's hat is pretty much "violence"—more specifically, the idea that a brawl pretty much solves any problem. The Llort's hat is basically kleptomania. The Shadows and Vorlons of course proudly promote their hats of "chaos" and "order and obedience" respectively, and try their hardest to make the younger races wear them too.
 * Lidsville takes the concept to its furthest extreme—a world entirely populated by actual anthropomorphic talking hats. Amusingly, despite being a planet of literal hats, it was not a planet of figurative hats.
 * Farscape had an episode on the planet Litigara where 90% of inhabitants were lawyers and the remaining 10% servants who ran the various non law-related services.
 * It could be called a planet of balaclavas, since that's what the lawyers always seemed to wear. Also, the Judge wore a hat that was a mix between a sombrero and a dinner plate, and (like the uniform) the colour looked like Dolores Umbridge picked it out.
 * The Nebari are presently attempting to make their home planet a Planet of Hats through brutal enforcement of the law- to the point that dissenters are often simply brainwashed into perfect citizens. As a result, the only Nebari encountered in the show are either cold-hearted police officers or rebellious criminals like Chiana.
 * In the first appearance of Captain Jack Harkness in Doctor Who, the Doctor explains to Rose that in the future, humanity's Hat becomes being more or less everywhere and having sex with more or less anything.
 * The Time Lords might be described as a planet of very silly hats indeed (look up images some time and try not to giggle). They tend to be portrayed as very Lawful Neutral (with frequent forays into Lawful Stupid) philosophers and scholars who one alien describes as a race of "ancient dusty senators" who were "peaceful to the point of indolence". The Doctor is very much an exception, being more of a Chaotic Good rebel and nonconformist, whom his people barely tolerate (though they sometimes need his help). There is some debate, however, on whether or not "Time Lord" is the same as "person from Gallifrey", and if this applies to the general populace of the planet or just the ruling class.
 * Justified in the case of both the Daleks and Cybermen, who are created races rather than natural ones. The Daleks are genetically engineered to feel no emotions but hatred and xenophobia, explaining their desire to destroy all non-Dalek life in the universe. The Cybermen have also had their emotions removed, and seek to survive by assimilating other races Borg-style. Their origins vary, however, as the classic series had them as a humanoid race that slowly lost their individuality as they replaced more and more of their bodies with technology, while the new series introduced an Alternate Universe version as the creation of one man, who intentionally removed their emotions so they could cope with the trauma of being "upgraded": they freak out and die if they remember who they are.
 * Along with these two are the Sontarans, a Proud Warrior Race Guy of clones made to be the best at fighting and conquering any planet that looks at them funny. They are so into the whole warrior thing that their form of punishment is forcing the perpetrator into a job as a nurse.
 * Doctor Who also contains a literal reference to the Planet of the Hats in the episode "Partners in Crime", suggesting that someone on the writing staff is aware of this site.
 * Donna: I packed ages ago, just in case. 'Cause I thought, hot weather, cold weather, no weather... he goes anywhere, I've gotta be prepared. Doctor: You've got a... a... hatbox?! Donna: Planet of the Hats, I'm ready!
 * The Twelve Colonies of the new Battlestar Galactica Reimagined occasionally fall into this, in function if not in populace. Aerilon was the breadbasket of the colonies, and everyone from it is perceived to be some sort of hick (which is why Baltar adopted a more upper class accent). The Gemenese believe in the literal truth of scripture. Sagittarons are downtrodden, and mad about it. Taurons are stoic and traditional, and have a mafia equivalent (depending on your perspective, they're either Space Mexicans or Space People of the Mediterranean). Capricans have it made - their planet is the center of art, culture, science, and politics. There is, however, no physical look specific to the people of any planet. Hopefully, this means that Single Biome Planet is avoided.
 * Caprica indicates that the title planet may have been a planet of actual hats, as well, at least 58 years before the Cylon genocide.
 * Used a lot in the Stargate Verse:
 * Particularly in the earlier Stargate SG-1 episodes, nearly every planet the SG-1 team visits is based off of a particular human culture. There are the Middle Ages, the Norse, the Greeks, the future, and, of course, the ancient Egyptians, among others. In the Stargate SG-1 episode "2001", the Aschen are described as: "They don't get excited in general, General. It's like an entire planet of accountants." There's also the Nox, who in addition to having extreme pacifism and irritating arrogance as their 'hat', were also a literal Planet of Hats: They were nothing more than humans with Bizarre Alien Biology and funny hats. Earth also has its own hat: Genre Savvy. SG-1 is the most Genre Savvy of them all, but most other minor characters show at least some signs of this trait. We Tau'ri have a technological hat, too—instead of basing more advanced tech off more exotic principles, we use fundamentally basic equipment in increasingly refined ways. This is particularly noted in our really spectacular projectile weapons. Justified in that most of these planets were supposedly populated by people of earth who had been taken to that planet by one of the more highly-developed species - the Goa'uld and the Asgard being the typical abductors. In many instances, it is further implied that many human cultures actually arose due to the activities of these species, many of whom took or created the identities of a variety of gods (the Asgard primarily taking on the Norse deities, and many of the Goa'uld taking on Egyptian, and occasionally Asian, deities). Also justified (for Goa'uld controlled planets) by constant fiddling by their overlords, and the typically small area that the Team actually visit on most planets. Averted on some planets that do have multiple nation-states with distinctive cultures.
 * In Stargate Atlantis, the Wraith are a race consisting solely of warriors who live to eat. In the last season, Todd the Wraith mentions that feeding on humans is the driving force in their society with little beyond that. We did finally get a small glimpse of Wraith society in Season 5's "The Queen." Judging from that episode, the entire society is divided into Queens, who seem to spend their time intimidating one another, their male Advisors/Viziers, who seem to specialize in Magnificent Bastardry, and the possibly asexual Drones, whose duties apparently involve patrolling ships and standing guard (not unlike actual Soldier Drones in Bee colonies). All of them are in thrall to a prime Queen (called The Primary in this particular segment shown, but this may not be the case with every Wraith alliance). Exactly where the various Male Wraiths who serve as scientists and field commanders (who are also uniformly errhm, uniformed in leather) fit into this mix is never really shown.
 * Red Dwarf had Rimmerworld, a planet populated by Rimmer clones. The population idealized the core aspects of Rimmer... which happened to be cowardice, backstabbing, snottiness, arrogance, and hunger for power. Those that deviated were hunted down and executed.
 * The Neighborhood of Make-Believe segment of Mister Rogers Neighborhood deconstructed this trope, in a child-appropriate way, with alien visitors from the Planet Purple. Everyone from this planet has purple skin and hair, they dress in identical purple clothes and speak in a monotone voice, and all the boys are named Paul and all the girls are named Pauline. They were used to illustrate how boring the world would be if everyone was the same.
 * Largely averted in Power Rangers, as alien cultures rarely seem to reflect aspects of earth society, the exception being planet Onyx. Its hat is the Wild West, existing largely as a place for the Evil Monster Saloon to be located.
 * An unusual example is Inquiris. Little is known about the planet, save that the natives, for whatever reason, cannot make declarative or exclamatory statements. Yes, a planet who's hat is literally a specific type of sentence.
 * The very basis of Sliders, where our protagonists would land, I mean slide, into a parallel Earth defined by a key difference with "real" Earth.
 * We don't see it, but while Illyria from Angel is talking about all the places and things she has seen, she mentions a planet made up entirely of shrimp. Of course, she "tired of that one quickly".

Newspaper Comics

 * Brewster Rockit: Space Guy! has had several. Possibly justified in the case of the Zombie Planet.

Radio

 * An episode of X Minus One featured a reptilian alien coming to a mining planet for one of their workers (basically a milder version of a Furian). The reptile alien's hat is that they Can Not Tell a Lie (although they don't have to say the whole truth either) while the "Furian's" hat is being Hot-Blooded. Lampshaded by the "Furian": "You know how they say we're all good at bar fights?"

Tabletop

 * 4th Edition Dungeons and Dragons splits the old traits of the elf race into two new races called "elves" and "eladrin". Because, you know, you can't have a single species wearing the intellectual hat and the close-to-nature hat at the same time.
 * Humanity's hat in 4th edition is being driven, ambitious, The Determinator, and being able to learn things faster than other races because of their shorter lifespans.
 * The Stellar Nations of Star*Drive all have their own hats.
 * In GURPS Fantasy 2: The Madlands, there is the region of Savringia. Thousands of years previously, two godlike entities decides to have a contest to see which one could create the most unlikely society. So they reduced themselves to energy and used that to create City-states of Hats. Currently there are about 30 but this is subject to change. There are the more ordinary Cities of Merchants, Tradesmen, and Priests, but there are also esoteric ones like Cities of Judges, Spiders, Grays, Silence, and the Fickle.
 * Since the expansion of Magic: The Gathering's focus to outside of Dominaria, most planes seem to follow this sort of pattern. For instance, Kamigawa resembles Feudal Japan in culture and aesthetics, Mirrodin is made almost entirely from metal, Innistrad is an It Got Worse version of Uberwald, and Zendikar is an adventurer's paradise with constantly-shifting landscapes and an endless number of unexplored ruins.
 * Many worlds in Warhammer 40000 are characterised by this—everyone from Cadia is a soldier, everyone from Krieg (German for "war") is an exceptionally grim and dour soldier in a longcoat, everyone from Catachan is Rambo. To be fair, they come from a planet sitting at the gates to a Negative Space Wedgie from hell, a (self-made) radioactive wasteland, and a Jungle Death World full of carnivorous plants and even worse animals respectively. The hats are likely survival mechanisms. For Imperial hats, the Imperium is a basically a portmanteau of the Roman Empire, the Catholic Church, the Third Reich and the U.S.S.R all turned Up to Eleven, so everyone being the same is not so incredible.
 * Eldar
 * Everyone from Ulthwe is a Psyker and a Chessmaster.
 * Everyone from Saim-Hann is an arrogant and aggressive barbarian on a jetbike.
 * Everyone from Alaitoc is a hooded loner with a sniper rifle.
 * Everyone from Biel-Tan is a disciplined and merciless, if highly specialized, warrior.
 * Everyone from Iyanden is a Wraithguard/Wraithlord.
 * Space Marines
 * Every White Scar is a futuristic Mongol on a bike.
 * Every Blood Angel is a cultured warrior on the brink of falling to the Red Thirst and temporarily REALLY want to kill things or fall to the Black Rage and start thinking that they're Sanguinius.
 * Every Blood Raven is a Kleptomaniac Hero.
 * Every Ultramarine is the Jack of All Stats, Roman and follows the Codex Astartes fanatically.
 * Every Imperial Fist enjoys their own pain and is an expert siege engineer.
 * Every Salamander is a Scary Black Man with a flamethrower, hiding a Gentle Giant underneath.
 * Every Raven Guard has a jetpack and lightning claws.
 * Every Space Wolf is a certified Badass Viking with a fondness for wolves.
 * Every Dark Angel is The Atoner and sworn to secrecy about their chapter, apart from the ones who they're sworn to secrecy about, who they spend an enormous amount of time and resources hunting down...
 * Every Grey Knight is Incorruptible Pure Pureness incarnate, psychic, and a religious fanatic whose faith is their chief weapon; and a daemon hunter.
 * Every Black Templar is, as the name suggests, a religious crusader.
 * Every Iron Hand is a cyborg Determinator, and have a right mechanical hands.
 * Chaos Space Marines
 * Every World Eater is an incarnation of Ax Crazy, and/or a Blood Knight.
 * Every Emperor's Child is horror with a killer guitar (apart from Fabius Bile, who is a Mad Scientist).
 * Every Death Guard is an implacable bag of walking filth.
 * Every sentient Thousand Son is a mad wizard in power armor. The others are all ghosts trapped in Space Marine armor.
 * Every Iron Warrior is a master siege engineer.
 * Every Night Lord is a psychotic serial killer akin to a Chaotic Evil Batman.
 * Every Alpha Legionnaire is an Ambiguously Evil Magnificent Bastard. They are also all Alpharius.
 * Every Word Bearer is an insane and unrelenting dark priest.
 * Every Black Legionnaire is out for revenge for the death of Horus.
 * For Space Marines and Chaos Space Marines, this is largely justified due to the fact that they all share genetic material with the primarch of their chapter - essentially, they have all been deliberately modified to be the same.
 * Orks
 * Every Bad Moon has more expensive gear than other orks and is decked out with flash. And they're teef fall and grow fast.
 * Every Blood Axe likes mimicking Imperial guard and is more orderly than your average ork.
 * Every Death Skull is a looter.
 * Every Evil Sun likes to go fast.
 * Every Goff is tougher than the average Ork. Not to mention smellier...
 * Every Snakebite is more primitive than any ork except ferals.
 * Tau (technically not a hat for the whole culture, but every caste has a specific purpose, and you're born into your caste, with crossbreeding between castes illegal. To be fair, the ethereals are breeding the perfect warriors, builders, diplomats etc... and even though they've only had a few thousands years, they may even technically be different species by now.)
 * Every Ethereal is a ruler of some sort.
 * Every member of the Fire caste is a warrior.
 * Every member of the Earth caste is a builder/scientist/engineer.
 * Every member of the Water caste is a bureaucrat/diplomat/politician.
 * Every member of the Air caste is a pilot/navigator/starship crewmember.
 * Some of the Tau sept-worlds have specific headgear, too. Everyone from N'dras is brooding, everyone from Ke'l'shan refuses to give up, everyone from Fal'shia is a problem solver and the list goes on and on.
 * Warhammer Fantasy Battle doesn't have Chapters, Legions or Craftworlds for obvious reasons, but they still have geographical boundaries or other distinctions that can dictate the headgear of the resident:
 * Empire
 * All Marienbugers are foppish, arrogant but irritatingly skilled dandies.
 * Everyone from Nuln is an engineer reeking of blackpowder.
 * All Reiklanders are skilled marksmen and consummate professional soldiers.
 * All Middenlander are hairy barbarians with a liking for blunt weapons.
 * Hochlanders are accomplished hunters and crack shots with hunting rifles and longbows.
 * Skaven - originally there were four five defined major clans: Skryre, the crazy techo-magical inventors; Moulder, the insane fleshcrafting breeders of monsters; Eshin, the cloaked espionage and assassination division; Pestilens, the gibbering worshipers of plague and decay; Mors, the now extremely powerful martial clan. A recent book on heraldry introduced scores of minor clans, each their their own (slightly smaller) hat.
 * Vampire Counts - Each Vampire Count will be from one of several bloodlines: Von Carstein (classic Dracula-style vampires, although recently have been modeled to be a lot more bestial), Lahmians (pseudo-Egyptian female vampires. With cats), Blood Dragons (honour-bound martial powerhouses who exist only for combat and proving themselves), Strigoi (horribly deformed ghouls with no link to their humanity at all) and Necrarchs (Nosferatu-like intellectuals who are wizened but terrifyingly powerful when it comes to magic).
 * Shadowrun 3rd edition features a section with members of each of the Five Races giving you a brief introduction to their race. Most of them start by acknowledging their race's hat, then going on to tear it apart as racist bullcrap. Except the dwarf, since their hat is being short.
 * Dwarves also have a hat of being technical wizkids. The dwarf explaining this has trouble working out how to fix a toaster.
 * Shadowrun does a good job of deconstructing the hats/stereotypes for each race. For instance, the dwarf states that a lot of dwarves live underground because basement apartments are cheaper and they don't mind the low ceilings. Amusingly enough, the human points out how he's different from the other races by mentioning the other races' hats and stating how Humans don't have any of those.
 * Traveller is a little more complex about this. Humans overall are as complex as, well, humans, though individual worlds often have a hat. The Aslan's hat is Proud Warrior Race, though arguably that quality is detailed well enough to take the hattiness away. The K'kree are Vegetarian Jihadists (yes, really). The Zhodani's hat is Psionics.
 * Nearly every race and culture in Talislanta wears a hat to some degree or another: Sarista are Lovable Rogues, Danuvians are Action Girls and Non Action Guys, Muses are Cloudcuckoolanders, Yassan are Gadgeteer Geniuses, Jaka are hunters, and so on. The Gao are a notable exception...but that's because Gao-Din is less a culture proper than a mixed bag.
 * A vast majority of the various D-Bees in Rifts fall neatly into this trope. The Simvan are all nomadic warriors with a psychic connection to animals, the Larmac are all lazy, the Naruni are all shrewd businessmen, etc. Occasionally aversions to this trope will be made in the case of individual NPCs, but the description almost always includes the statement "Unlike most members of X's race..."
 * Space Munchkin The RPG had the Bumpy Foreheaded Alien race, which is actually a category for all races of this type in scifi. You chose (or randomly rolled) your one distinguishing racial feature, the concept that your culture is entirely devoted to and the concept from human culture your culture cannot understand ("We have no word for this thing you call 'modesty'")

Video Games
"Warden: "Tell me about the qunari." Sten: "No." Warden: "Well, that wasn't what I expected to hear." Sten: "Get used to disappointment. People are not simple. They cannot be defined for easy reference in the manner of: 'the elves are a lithe, pointy-eared people who excel at poverty.'""
 * The various alien races from Star Control come from different varieties of Planet of Hats. The Spathi are cowardly to the point of paranoia, the Pkunk are hippy-dippy psychics, and there's three species each of Scary Dogmatic Aliens (the Ilwrath and both breeds of Ur-Quan) and Proud Warrior Race Guy (the Thraddash, the Shofixti, and the Yehat).
 * The world in Pokémon seems to be a Planet of Hats as well—much of culture and society revolves around Pokémon, from the economy (shops and huge department stores which sell only Pokémon-related goods) to the government. And since every town is surrounded by tall grass, it's technically impossible to even leave town without a Pokémon of your own.
 * That said, with the right tools...
 * Lampshaded in Mass Effect. Kaidan comments that Warrior Poet Wrex isn't exactly what he was expecting from a krogan, to which Wrex dryly replies, "Because humans are all different, but every krogan is exactly alike." Kaidan hastily shuts up.
 * Wrex has a response for Garrus when he confronts Wrex with the same observation: 'I suppose it was easier to unleash a genocide virus on the krogan when you thought we were all mindless monsters, turian.'
 * Of course, Garrus was just a detective in C-Sec before signing on with Shepard, so insinuating that he's at all responsible for the genophage (because he's a turian, and turians wronged krogans, so obviously...) is a mite hypocritical of Wrex.
 * According to aliens, humanity's hat is that they're a bit of a loose cannon. Also, we seem to be evolving towards a monoculture with minimal racial differences due to globalization - we just haven't gotten quite as far as the other races, yet. The Batarians also see humans as the Jerkass (and vice versa), mostly due to competition over colonizing the same region of space.
 * As the story progresses, it is slowly becoming revealed that Humanity's "hat" is The Determinator. They use their ingenuity to adapt to meet whatever kind of challenge is thrown at them. Use a binding treaty to restrict the number of Dreadnoughts (essentially a ship built around a BFG) that they can utilize? They invent a new class of ship that is not bound by this restriction, yet can stand toe to toe against such ships (a reference to the US's circumventing the Washington Naval Treaty limiting the construction of battleships by developing aircraft carriers instead). Reaper invasion looming on the horizon? Humans were the only race that even thought of the idea of destroying a Mass Relay (pretty much everyone else basically assumed it would be impossible). The Illusive Man resurrected Shepard primarily because Shepard was "more than just a soldier". Shepard had become the best traits of humanity distilled into one person; whether Shepard was more on the Jerkass side of things or not, Shepard definitely embodies The Determinator, and thus was worth the extreme financial and technological investment to preserve.
 * There's a lot of subversion of this trope in the franchise too. One of the main features of Mass Effect was that although each race has a hat, the hats also tend to come off a lot. Turians are presented as militaristic and disciplined, yet you encounter drunken turian soldiers, turian scientists and janitors, and turian shopkeepers (one of whom is part of a Running Gag involving a human trying to return a purchase to his store.) Asari are presented as mediators and negotiators, yet we encounter asari commandos, strippers, pirates, slavers, and Machiavellian diplomats trying to manipulate Shepard to their own ends. Salarians are presented as spies and scientists, but we encounter salarian corporate officers, shopkeepers, mercenaries, and a group of impressively disciplined commandos. Krogans are supposed to be largely brainless brutes who dream of fighting in a massive horde yet we've encountered a mad scientist, a researcher, a mechanic, and a love-stricken poet.
 * Some individuals will actually subvert their race's hat to their own ends. One Krogan businessman on illium was extremely polite and well-spoken, but used his status as a Krogan for pure intimidation factor, an important asset on a world such as Illium. A "series of polite calls", indeed.
 * Amusingly, the researcher actually wore the krogan hat proudly. Apparently, he had to kill the previous head researcher to gain the position.
 * Mass Effect 2 suggests humanity's hat is more likely to be discarded than other species. Mordin observes that most species tend to fit certain expectations—similar intelligence, biotic ability, behavior, what have you. While there are outliers in all species (geniuses and morons) humans tend to have more outliers than not.
 * Humans are seen as violent upstarts - some backstory material mentions that, although each race had internal wars, what the humans did to each other was regarded as especially hideous (even when compared to the Krogan). Also, humans are rapacious colonists and breeders.
 * The games even do this for species with only one representative. The second game's DLC introduces the yahg, who Liara classifies as a primitive race of hulking brutes who are limited to their home world because they slaughtered the First Contact team sent to establish terms with them.
 * Sten, from Dragon Age has this to say, which can actually sum up what BioWare thinks of this trope.


 * Meteos, despite being a puzzle game, has a good number of these. There's a planet for robots, insomniacs, stubborn miners, shapeshifters, timid jumpers, gangsters, telepaths, bees, ninjas, and ascended psychics each.
 * The computer game Spaceward Ho! gets honorable mention. It's a light turn-based strategy affair and doesn't have culture, but planet ownership is indicated by hats. A variety of cowboy hats worn by the actual planets. Santa hats if the game is played on December 25.
 * In Spore, when your race reaches the Space phase, they are assigned a hat based on their actions up until that point, which usually falls into the standard sci-fi racial norms. There's Shaman, Trader, Warrior, Diplomat, Zealot, Scientist, Ecologist, Bard, Knight and Wanderer.
 * This actually makes a bit of sense: until space-travel, members of a race would have to fill all the economic niches necessary for survival; once there's easy star-travel, specialisation would be possible. See: finding a cheap toy made in the U.S., post-{globalism and Chinese capitalism}.
 * Earth has become this in Mega Man Star Force, with the hat being The Power of Friendship. People even get significant discounts and increased political rights as they become popular.
 * In Startopia, the alien races are each suited to one specific task—OK, two related tasks for the blue-collar Salthogs. Karmarama are purple four-armed hippies, that plant seeds. Turraken are two-headed nerds, that are all scientists. Sirens are sexy winged humanoids, and the only aliens in the game with obvious gender dimorphism, and they "love" others. And so on. The most specialised are the Grekka Targ, who are solely employed to run your communications gear.
 * The Greys are all experts in xenobiology after experimenting on all known races, so they run the sickbays. The Kasvagorians are all Proud Warrior Race Guys, making them useful only as security guards. The Zedem Monks are, well, a race of monks, whose hands have evolved to naturally be in the prayer gesture. The Polvakian Gem Slugs are all hedonistic aristocrats and an obvious parody of the Hutts.
 * This is slightly subverted with the Greys, Salt Hogs, Grekka Targs, who also participate in defense along with the Gors.
 * In Chronomaster, you play a retired designer of Planets of Hats. The mini-universes you end up visiting include a hypermilitant world, a space casino, and a Cloudcuckooland. To top it off, one world that you never even see is implied to be pop Jung-themed, and solving an optional puzzle requires you to warn somebody who's going there of the inevitable Evil Twin threat.
 * The world of Loom is divided into xenophobic guilds, each with a specific craft, e.g. Weavers, Glassmakers, etc. Each guild's citizens seem to all bear the characteristics of their guild. For instance, the glassmakers value traits such as clarity and beauty, and have names like Luscent Bottleblower. Somewhat justified in that the thing that defines them is what their community was formed on in the first place.
 * Gilneas in World of Warcraft: Cataclysm, even before worgen curse, seems to be a literal Nation of Hats. As far as you can see, everyone in the starting zone wears some kind of hat. And not just any hats, but nice hats!
 * Warcraft 2 had several examples of this trope among the human nations and orcish clans. Dalaran was all mages, Kul'Tiras was all sailors, Stromgarde was all warriors, Alterac was all snobs. The Twilight's Hammer was all end of the world cultists, the Stormreavers were all warlocks, Laughing Skull were all backstabbing traitors, Warsong could all do earsplitting battlecries, Bonechewers were all cannibals. In World of Warcraft, dwarves continue to fit this loosely. Ironforge dwarves are mostly smiths and disciplined warriors, Wildhammers are nature loving barbarians, and Dark Irons are all sneaky spies, thieves, assassins, and pyromaniacs.
 * Cataclysm has provided many races a chance to get new hats. Night elves can now be magi, something that was long forbidden in their culture. Dwarves can now be shamans, providing stark contrast to their otherwise industrial nature (at least of the Bronzebeard variety). Orcs are seriously divided over whether or not Garrosh Hellscream is a good leader—even though the should fully embrace a blood-and-thunder warrior. There is still a tremendous amount of hat wearing though, and while not all races have true hats, they have collective niches, which both the Horde and the Alliance forming parts of Six Race gang.
 * In Bangai-O, the heroes hail from Dan Star, a planet populated with Hot-Blooded men. Since the game focuses entirely on shoot-em up action (and little elaboration on the setting), one can only imagine what it must be like there.
 * The Space Pirates of Metroid are actually an alien species that has piracy and galactic domination as its hats. There's also the Krikens of Metroid Prime: Hunters, who exist to raze other worlds to the ground.
 * Used with human colonies in the Halo verse; Harvest consisted of American Midwestern colonists, and Reach was mostly Hungarian.
 * Done on purpose by the Covenant. The Prophets set up their society so that none of the various races could get by on their own. One character spends the whole of the novel Glasslands searching ancient texts to rediscover things like agriculture, to keep her world from total collapse.
 * Forerunners apparently are very fond of hats, and all of them have their own unique personal design. But really, averted. Forerunners are even physically divided via mutation into Lifeworkers (scientists), Warriors, Builders, etc. While each generally conform to a few generalities within their rate (warriors are stoic and honorable, Lifeworkers like life, etc.), they are very close to humans in their diversity.
 * The X-Universe is really bad about this, due in large part to the games' near lack of plot and characterization (though that's not necessarily bad). Every faction has a hat that fits every character of that race. The Terrans are high-tech xenophobes, the Split are a Proud Warrior Race, the Teladi are Proud Merchant Lizard Folk, the Boron are peace-loving Squid People, etc.
 * This was the objective of the Smithy Gang in Super Mario RPG: To turn the Mushroom Kingdom into a world filled with... WEAPONS!
 * Fallout: New Vegas' factions defintely fall into this phenomenon. The NCR are democratic republicans, House is a Chinese Autocrat, the Legion is Rome as raiders, the Brotherhood are xenophobes with power armor, the Followers are anarchist doctors, the Gun Runners... well that one's self explanatory, the Kings are Elvis impersonators, the Boomers are high artillary nuts who want to become pilots, the Chairmen are the Rat Pack, the Omertas are the Mafia, the White Glove Society are high class, and the New Canaanites are master gunsmiths and religous.

Web Animation

 * Parodied in the Flash-animation series Burnt Face Man. In the conclusion of episode 7, Bastard Man (yes, that's his name) steals all the world's air with a vacuum cleaner (yes, he did that) and tries to sell it to a "planet of shifty characters". Everyone on the planet is wearing a large overcoat and hat or they are hidden in the shadows, the main shifty guy telling Bastard Man that they might not pay him for the air because they're all "a bit shifty".

Web Comics

 * Melonpool's planet Melotia is a planet of couch potatoes. There's a Bizarre Alien Biology explanation, with their antennae resonating to Earth television broadcast frequencies.
 * In Sluggy Freelance the residents of the Dimension of Lame are all incredibly sweet, nice, rice cake-loving pacifists. The most deranged psychopath among them suffers an incredible bout of guilt after slightly bruising the toe of a murderous demon. Even the rules of the universe conform to this Hat: the sewers smell like flowers, fermentation doesn't exist, and all swear words are automatically replaced with a "bleep" noise.
 * Goats's Multiverse has entire Dimensions of Hats, such as Topeka Prime, the farm dimension, complete with cow computers. Each dimension, however, has a pub.
 * This strip directly discusses this trope.
 * Curvy invokes this; every Earth explicitly has a gimmick, and ours is apparently "Boring World".
 * Parodied in this episode of Mountain Time, as the astronauts are all too eager to attach a gimmicky label to a newfound planet.
 * Some of the aliens seen in Buck Godot: Zap Gun for Hire seem to fit this trope, with all individuals seen having similar behaviour or jobs. However, just as many are as varied as humans both in behaviour and appearance.
 * Subverted in Quentyn Quinn, Space Ranger! Groonch the Gnorch, a parody of Worf from Star Trek, says that despite being raised with the ideals of another alien race, he strives to be the kind of noble warrior honored by "the Gnorch peoples." Quentyn asks, "Which peoples?" Groonch then learns, to his complete surprise, that the Gnorch species is rather culturally diverse and only a handful of ancient tribes were as warlike as he thought. His own outfit is an odd cultural mishmash.
 * Referenced, perhaps, in this Cwen's Quest strip. Haaaaaaaats!
 * Used for some aliens in Spacetrawler. The Eebs are all Gadgeteer Genius telepaths with almost zero willpower. The Tornites are infamous for their bad fashion sense.

Web Original

 * Limyaaels Fantasy Rants discusses this in her Avoiding gimmick-worlds rant here.
 * Associated Space has Sarmatia, the planet of Space Amish nomadic horse warriors, and New Tau Ceti, the planet of religious fanatic sheep-men.
 * Played straight in some of the more comedic episodes of AH Dot Com the Series, when (much like Star Trek) this week's timeline is simply a planet-sized Town with a Dark Secret. More usually averted, as after all all the planets featured are variants of Earth and often feature several power blocs facing off.
 * This is #3 of Cracked's 6 Sci-Fi Movie Conventions (That Need to Die).

Western Animation
"People: AAARGH! Something green! AAARGH! Something not green! PsyCrow: I love this planet."
 * The reverse of this is used in the South Park episode "Cancelled": apparently every planet except Earth has only one species, with "a planet of deer, a planet of Asians," etc. Earth was started billions of years ago with creatures from all over the universe on one planet---as part of an intergalactic Reality Show.
 * A previous Marklar of Marklar introduced the Marklar of Marklar. The Marklar used the Marklar "Marklar" for all Marklar. The Marklar spoke otherwise perfect Marklar.
 * Futurama would often use ridiculous examples, i.e. the Neutral planet, the cannibal planet, planet of human-hating robots. In "Love and Rocket", Dr. Zoidberg (himself from a planet of Crustacean Space Jews) talks about the planets destroyed by love radiation why not, "including two gangster planets and a cowboy world."
 * The opening of a certain episode sees the Planet Express crew return pantless and low on supplies from "the planet of the moochers."
 * Don't forget the planet of gigantic Feminists.
 * The episode "The Duh-Vinci Code" introduces a planet of Insufferable Geniuses. How smart were they? Leonardo da Vinci left because he was the dumbest person there.
 * Transformers Cybertron is very guilty of this. There are three planets where a great deal of the action takes place: Gigantion, the giant planet, is populated by massive Transformers obsessed with construction, aided by the tiny Mini-Cons. On Velocitron, the speed planet, the fastest rule and those who don't measure up are left in the dust. And on the unnamed Jungle Planet, might doesn't make right so much as it is right. As if Cybertron, a planet populated by giant transforming robots, wasn't enough of a hat planet in its own right. (Admittedly, "giant transforming robot" is a pretty cool hat.)
 * As well, Transformers: The Movie had the planet Junk, where a race of robots made of scrap live; their entire culture is based on TV and radio transmissions from Earth, with the result that they say things like "Stop, thief! No welcome wagon 'hello stranger' with that new coffee flavor for you!". This was homaged in the Live Action Adaptation where Optimus Prime claimed the Autobots learned to speak English 'from your Internet'.
 * Pretty much every non-Transformer alien planet in Transformers Generation 1 was made of hat. Honorable mention to Earth, where although humans filled a variety of social roles, they almost all wore construction worker hard hats.
 * Likewise, Transformers Headmasters had a planet of humans innately in touch with nature, and a pirate planet.
 * Averted in Transformers Animated, where the robots have wildly different cultures, preferences, and interests. And their politics are just as messed up as ours.
 * One episode of Veggie Tales had two feuding Towns of Hats used for their Good Samaritan retelling. One town wore shoes and boots on their heads, and the other wore pots. The purpose was to show how people are divided by trivial differences, a rare acknowledgment of the silliness of Planets of Hats.
 * A three-part Pinky and The Brain episode involves the protagonists being taken to a city of hats. There, everyone is ... a hat.
 * Invader Zim parodies this; the Irken Empire includes such ridiculous territories as "Conventia, the Convention Hall Planet" and "Foodcourtia," a planet of nothing but restaurants. Justified because these planets don't seem to actually start out this way: one episode shows the Tallests after the conquest of the planet Blorch, deciding to make it a "parking garage planet" literally on the spot.
 * The Irkens themselves are a culture based on height. Dib points out how stupid this is.
 * Another example might be the Planet Jackers, whose culture seems to revolve around collecting new planets to throw into their sun.
 * Fans generally assume that the Vortians were essentially a species of nothing but scientists. This is never made explicit on the show, but it is plausible, as they are almost always mentioned in relation to some sort of technological achievement. The only two important Vort characters, Lard Nar and Prisoner 777, were both inventors.
 * In Megas XLR, Jamie mentions to Kiva to take them to the "planet of the Space Amazons", to which Kiva replies "I'm from the future, not a comic book!". Though the post credits sequence seems to suggest such a planet exists...
 * The titular anthropomorphic ducks of The Mighty Ducks come from a planet whose entire culture revolves around hockey. Yes, seriously.
 * Most episodes of Super Mario Bros Super Show featured Mario, Luigi, Toad, and Princess Peach travelling to a different world built around a particular theme (e.g., karate, rock-n-roll, cowboys, rap). Also, Bowser and his minions always seemed to conform to the "hat" of the world, appearing as a different stock villain in each episode.
 * Earthworm Jim had that one planet inhabited by people that are easily startled.


 * Darkwing Duck had some fun with this trope in one episode, where our hero visits the planet Mertz, where every single person is a superhero (complete with everyone having a totally unnecessary secret identity.) There is only one person on the planet without super powers, whose name is actually Ordinary Guy. Everyone else spends their entire lives trying to rescue him from peril (which in practice means gigantic, city-smashing brawls over who gets to help him cross the street.) Needless to say, Ordinary Guy's life sucks. Eventually, he snaps and becomes the planet's first and only supervillain. This gives him an outlet for his rage, and gives the heroes some actual evil to fight, making everyone much happier.
 * An absolutely literal version of this trope is used as well: Two episodes featured aliens from a planet where all aliens actually are hats, who hop onto other beings' heads to control them.
 * Kaput & Zösky is a cartoon series based entirely on Planets of Hats. The titular characters wander from planet to planet, hoping to find one where the population's hats make them easy to conquer and pleasant to rule.
 * The Eggs follows the colourful adventures of the four anthropomorphic egg college graduates as they continue their mission through the Loonyverse to search out valuable new sounds for their music-loving home planet of Kazoo. Not only is Kazoo a Planet of the Hats (the hat being music), but every world they visit seems to have its own specific hat.
 * The Yolkians in The Adventures of Jimmy Neutron are all basically gobs of slime with eyes contained in a metallic, robotic "skin", featuring a glass upper half for sight and a bottom half fully electronic with a hovering mechanism and arms.
 * Rob The Robot. Dammit, that show has a planet for practically every theme.
 * On Buzz Lightyear of Star Command, we had Rhizome, a planet of peace-loving vegetarians, and mention is made of a "planet of widows and orphans".
 * In Titan Maximum, Eris is inhabited solely by rednecks and Mercury by old people. Neptune is a gigantic winter resort, with a lone steam-in-a-can production facility.

Other

 * The Point! is a fable which Harry Nilsson used to make an entire soundtrack. It was later adapted into an animated film and screenplay using the soundtrack. The entire fable revolved around a planet on which everything had a point on it, with the sole exception of the main character. He is shunned as a result.
 * Some scientists argue that through alien eyes, Earth could be seen as a planet of hats - aliens would first notice all common traits of humans and ignore all the differences.
 * Many exoplanets have a designation that starts with HAT.