The Cairn First are a race of mute, telepathic humanoids first introduced in the Star Trek: The Next Generation episode, "Dark Page". Due to the fact that the Cairn's telepathic thoughts are represented as mental images rather than words, other telepathic species have difficulty interacting with them.
Caitians are a race of humanoid cat-like aliens. Caitians are upright bipeds with pointed ears, slit-shaped pupils, whiskers, a tail and thick fur (usually including a mane). In addition to physical traits, Caitians are curious and have a hunter's instinct. Caitians were introduced in Star Trek: The Animated Series, which featured communications officer M'Ress. Caitians have been observed in the feature films and appear often in the Pocket Books extended series. The Caitian homeworld is Cait, a Class M planet known to the Caitians themselves as Ferasa. Cait is a member of the United Federation of Planets. Caitians speak a combination of vowel and soft consonant sounds which to human ears would not sound like speech so much as purring.
A Caitian Admiral was seen in Starfleet Headquarters in Star Trek IV: The Voyage Home, and a three-breasted felinoid dancer attacked Captain Kirk on Nimbus III in Star Trek V: The Final Frontier. This may not have been a Caitian, however. Caitians are a playable species via purchasable content in the game Star Trek Online.
Changelings are an alien race that have the ability to shapeshift. The Changelings were introduced in the third season Star Trek: Deep Space Nine episode The Search. Prior to this, Constable Odo, one of the main characters of DS9 was the only Changeling featured.
Their natural state is a liquid protoplasm. The Female Changeling once told Odo that their race once had bodies similar to those of other species, but they had since evolved beyond those physical bodies. Changelings have the ability to meld together (in a process known as "linking") to share information and emotions in a very intimate manner.
Changelings can turn themselves into almost anything. They can form themselves into any solid, liquid, gas, or even chemical reactions like fire, and can flow through any gap in their gaseous or liquid state. It is speculated that their power involves sending matter and energy to (and recruiting it from) subspace, as they have often demonstrated the ability to alter their apparent mass. (For instance, when Odo assumes the form of an object much smaller than he is, his temperature does not increase as it would if he were simply compressing his volume, and he can become light enough for an ordinary person to carry without trouble.) When they assume a different shape, such as a rock, scanners will show them as that substance. Changelings who have sufficiently disciplined their shapeshifting abilities are able to turn themselves into convincing imitations of lifeforms, including both animals and other humanoids. Changelings can even survive in the vacuum of space, and can somehow propel themselves through it, presumably at speeds great enough to effect interstellar travel. However, if a part of a changeling is separated from the whole, it reverts to the liquid state. In addition, some inexperienced Changelings (such as Odo) must regenerate, returning to their liquid form once every sixteen to eighteen hours. The Cardassians developed a device which, by emitting a quantum stasis field, can prevent a changeling from reverting to the liquid form, a state which Odo swiftly found extremely painful.
 The Founders
The Changelings are native to the Gamma Quadrant. All but one hundred of the Changelings are Founders, the rulers of the Dominion (Odo is one of The Hundred, which were sent out to explore the galaxy). For many years, the Founders were considered mythical by many of the races in the Dominion, although their policy was enforced by the Vorta and the Jem'Hadar. It was not until 2371, when Odo discovered the changelings' homeworld in the Omarion Nebula, that the Founders' true status was revealed. They seek power because they were once persecuted by non-shape-shifters, whom they call 'Solids', or 'Mono-forms'. After the discovery of the Bajoran wormhole and the rise of the Dominion as a threat, the covert Federation Security organization Section 31 created a viral disease that slowly robbed the Changelings of their ability to shapeshift and deteriorated their bodies before killing them, with which they secretly infected Odo during the show's fourth season. This was later revealed during the show's nine-episode finale arc, when the Federation and Dominion were at war. Because Odo had linked with the Female Founder with whom he was familiar numerous times, this meant that the entire Great Link was infected as well. Deep Space Nine Chief Medical Officer Dr. Julian Bashir managed to find the cure for the disease, curing Odo. Odo himself agreed to pass on the cure to the Female Founder and then the Great Link in exchange for the Female Founder's surrender of the Dominion and herself to the Federation. After the Female Founder accepted this deal, and the war was over, Odo returned to the Founder Homeworld to fulfill his end of the bargain, as well as to teach his people about the solids from his unique perspective.
Chameloids are shapeshifters and reported to be mythical. However, Kirk and Bones meet a female chameloid named Martia in Star Trek VI, while imprisoned in the penal asteroid archipelago Rura Penthe. Martia there takes the forms of an attractive human woman, a blonde human child, a fur-covered humanoid brute, and finally, Kirk himself.
In an earlier version of the script, Martia states that the ability to shift shapes was particularly useful in smuggling, which was an "ancient and respected trade" on her homeworld of Arc, and the crime for which she was imprisoned in Rura Penthe.
The Corvallens are a humanoid species of mercenaries who often engaged in interstellar commerce. They have been known to operate near the Romulan Star Empire.
The Cytherians were an advanced race who lived near the center of the galaxy. They were explorers and made contact with various other races. It should be noted that their manner of initiating first contact was atypical; they brought other races to them rather than traveling the galaxy in search of intelligent life.
In 2367, the USS Enterprise-D encountered an alien probe while attempting to repair the Argus Array. The probe interfaced with Lieutenant Reginald Barclay, and gave him the advanced knowledge needed to bring the Enterprise to the Cytherians, the presumed makers of the device. After the Enterprise had arrived at the Cytherians' homeworld, Lieutenant Barclay was returned to normal. (TNG: "The Nth Degree")
The Cytherian was played by Kay E. Kuter.
"Cytherean" is also an adjective that is also used (along with "Venerian") to refer to things pertaining to the planet Venus. A hypothetical inhabitant (not very likely given the conditions there) of Venus could be referred to as a Cytherian; a NASA technical report was titled "A theoretical study of the martian and cytherian ionospheres".
In the fictional Star Trek universe, the Deltans are a closely humanoid species, probably Federation members. Only one named Deltan has been seen on screen, Lieutenant Ilia in Star Trek: The Motion Picture. In addition, several anonymous Deltans have been shown:
- USS Excelsior seemed to have a a Deltan officer in Star Trek III: The Search for Spock.
- Star Trek IV: The Voyage Home features a Deltan ambassador.
- In Vonda McIntyre's novelization of Star Trek II: The Wrath of Khan, two of the Project Genesis scientists on the Regula 1 space station are a Deltan couple.
Lt. Ilia has a bald head, which may be a defining Deltan trait. They have a limited telepathic ability, allowing them to use touch to stop another person from feeling pain. Deltans emit extremely powerful pheromones, provoking a strong sexual reaction in many other species.
When she reported to Kirk, Ilia stated that her "Oath of Celibacy" was on record. While the original theatrical release does not expand on this, deleted scenes that were later incorporated into the film include dialogue establishing that she is "as safe as any Human" and that she would never take advantage of a "sexually immature species". Deltan culture is also said to emphasise sexuality heavily: Roddenberry once said that, to a Deltan, sex was like a handshake. Deltans in Starfleet were forbidden from engaging in sexual activity, so as to limit their disruptive influence on other species. Various novels and other non-canon sources contend that sexual activity with a Deltan is such an intense experience that a non-Deltan who engages in such activity with a Deltan risks insanity.
Deltans were not seen or prominently mentioned at all in the 24th-century adventures.
In an episode of Enterprise (title "Bound", season 4), Travis Mayweather told Lt. Reed about the time a group of Deltans came aboard his family's ship when he was a teenager.
The Denobulans are a fictional humanoid race in the Star Trek universe. They were introduced in the Enterprise series. They originate from the planet Denobula Triaxa. Doctor Phlox is a Denobulan. The planet itself is densely populated, having 12 billion people living on one continent.
The Denobulans are humanoid with facial ridges. They sleep less than humans but do hibernate for six days a year. When threatened, Denobulans can inflate their heads like blowfish to scare off predators. Denobulans are also expert climbers, thus making them suitable for exploring caves, canyons and other sheer rock formations. Denobulans, or at least the ones that spend their time away from their planet, have a penchant for scientific research, and each Denobulan that Enterprise has encountered has been a researcher of some sort.
They have long tongues, unprotruded spines, and their toenails grow quickly, which need regular cutting (Phlox mentions that he cuts his once a week). They are long lived, which gives Phlox ample time to gain a number of degrees in various medical fields. They have considerably wide smiles, compared to humans, a fact emphasised by a secondary set of mouth muscles that widen the smile even further. Denobulans have successfully genetically enhanced their race without the violent consequences that humans suffered when they created augmented humans.
Denobulans are polyamorous, with each Denobulan typically having up to three spouses who, in turn, have up to three spouses. Phlox mentions that his extended family includes 31 individuals. They have complex mating rituals, and they (the males at least) don't like to be touched. Denobulans usually don't have pets, and they abandoned television a long time ago, believing their real life to be much more exciting. Despite their rather liberal views on sex, (male) Denobulans are exceedingly modest when it comes to disrobing in front of others.
Compared to other humanoid species, Denobulans are resistant to Borg nanoprobes and subsequent assimilation. ("Regeneration")
Denobulans used to be xenophobic, but they overcame it and now enjoy contact with other species, presumably after a race known as the B'saari made first contact with them. They were once at war with the Antarans, a neighboring species. They established friendly relations with Earth at least before 2151.
The Devore are a humanoid species native to the Delta Quadrant. Their distinguishing features are a series of delicate ridges over the eyebrows and down the bridge of the nose.
They especially harbor a deep mistrust of telepaths.
A type of immortal energy being with vast mental powers: capable of telepathic manipulation, creating convincing physical manifestations of potentially great size and power, and even of destroying an entire spacefaring race with a single hateful thought, though.
Drayans live on Drayan II, and have little to no contact with outside races. They have a very closed society, due to their species unique attribute of aging. It is uncertain how Drayans are born: They are born looking as if they are elderly, around the human age of 100. From there, they age backwards, growing younger in body as they grow older in wisdom and experience.
When they appear to be the age of a six-year-old human child (making them over 90 in Drayan years), they are shuttled over to one of the moons of Drayan II, where they essentially die. Their bodies disappear, leaving only their clothes behind. This journey is viewed as a sacrament.
Basically humanoid in appearance, Drayans have a colored line down their forehead, the only visible mark that distinguishes them from humans.
The Edo are a species of humanoids on the planet Rubicun III. In general, the Edo resemble physically attractive blond-haired humans. They are a highly and openly affectionate people; according to Tasha Yar, they make love at a drop of "any hat." In addition, their laws are strange and unusual. The police officers (called "mediators") randomly and secretly select a "punishment zone"; however, the only 'punishment', no matter how trivial or severe the crime, is death by a painless poison injection. The Edo reasoned that since nobody knows which zone has been picked, and nobody wants to risk death, thus nobody would break any laws.
In the TNG episode "Justice", the Enterprise encounters this species. In that episode the planet's overseer entity sends a probe that interfaces with Data, rendering him unconscious for a short time. While accompanying members of the crew on a visit to the planet for shore leave, Wesley Crusher crashes through a protective screen onto new flowers. The Mediators inform him that he violated a punishment zone, and Crusher is sentenced to death. Riker, Yar, and Worf forcibly intervene, forcing Picard to become involved on the boy's behalf (despite the obvious Prime Directive violation caused by doing so).
Edosians (aka Edoans) are a race of tripodal sentient aliens. Edosians have an orange complexion, two yellow eyes, three arms and three dog-like legs. Navigator Lieutenant Arex was introduced in Star Trek: The Animated Series, but his planet of origin, Edos, was mentioned only in background material. Passing references to Edosian flora and fauna have been made in episodes of Star Trek: Deep Space Nine and Star Trek: Enterprise. In some tie-in novels and short stories, Arex is mentioned as actually being a Triexian.
El-Aurians (sometimes known as The Race of Listeners) are a humanoid race first introduced in the second season of Star Trek: The Next Generation with the character of Guinan. The species was named in the Star Trek: Deep Space Nine episode "Rivals".
El-Aurians are physically similar to humans, but they can live well over 700 years. El-Aurians also have a variety of racial types, with both dark and light skinned members of the race being shown on various Star Trek movies and television episodes. They are considered a race of listeners and often appear very patient and wise.
It is uncertain whether the El-Aurians have any powers beyond those of normal humanoids. One possible piece of evidence that they do is when Guinan raises a hand threateningly to Q. This threat seems to be taken seriously at the time, though it is also possible that it may have been largely gestural. Another possible ability of this species is their ability to discern changes in the timeline.
Some El-Aurians, such as Guinan, visited Earth in the late 19th century, which suggests that they were warp-capable at that time. But, it is possible that some may have been there longer, since during the series, Guinan mentions that she knew Frankenstein.
The El-Aurian homeworld was located in the Delta Quadrant. It was assimilated by the Borg in the mid 23rd century. Very few survived, and those who did were scattered throughout the galaxy. Some of the refugees came to the United Federation of Planets. It has been noted that this is likely an analogy for the spread of Africans around the Earth via colonialism and slavery.
The Enarans are the natives of the planet Enara Prime in the Delta Quadrant. They are a warp capable species but have only relatively low level engines. The Enarans are very concerned with personal hygiene and invented radioseptics for hand washing and personal cleaning. In addition to Enara Prime, they maintain an outpost at the Fima Colony.
Physically, the Enarans are humanoid with red spotting near the eyes and forehead. As a species they are telepathic, able to implant memories in another person whether they are willing or not. However, making telepathic contact with an unwilling person is deeply condemned.
Eska are a humanoid race with a ridge that goes from their forehead down to their nose. The Eska go to a rogue planet to hunt the local wildlife, hunting large pig-like creatures, animals they call Fire Wolves, and Wraiths, the planet's sentient species, a shape-shifting, telepathic gastropod. The Eska appeared in the Enterprise episode Rogue Planet.
The Fek'Ihri were an ancient enemy of Kahless the Unforgettable on Qo'noS 1,500 years ago, when he was building the Klingon Empire. Kahless conquered the Fek'Ihri wielding the Sword of Kahless, the first bat'leth. ("The Sword of Kahless")
Gallamites are a humanoid race who have a transparent skull. They are mentioned in the Deep Space 9 episode ,Penumbra. It is also possible that the humanoid Worf was fighting in the holosuite in the episode The Way of Warrior was a Gallamite.
Delta quadrant race which was at war with Talax. Doctor Ma'bor Jetrel of the Haakonian Order created the Metreon Cascade, a cataclysmic weapon which destroyed Rinax, Neelix's homeworld. Neelix was understandably upset by Doctor Jetrel's presence on Voyager, though his anger was mitigated somewhat when Jetrel revealed that he was attempting to find a way to revive the victims of the Cascade.
The Hazari are an aggressive race from the Delta Quadrant who made themselves available as bounty hunters to capture alien vessels.
The USS Voyager encountered the Hazari race when they were hired to capture the ship, forcing Captain Janeway to enlist help from a travelling "Think Tank" to avoid capture.
The Hierarchy species were a species from the a region of space near the Beta-Delta Quadrant border that controlled the Hierarchy.
Physically the species is humanoid with dull brown skin, and few distinguishing features - hairless, and with few noticeable facial features, it is almost impossible for other species to distinguish between individuals of this race.
They use surveillance on passing ships for future raids. This is done by special surveillance ships, hiding in Nebulae for example, who use sensors to assess the tactical risk of attacking passing vessels and the available loot. They use cloaked ships to sneak up on vessels.
The Hirogen are a fictional race in the Star Trek universe. They are spacefaring and nomadic and featured in Star Trek: Voyager. Resident to the Delta Quadrant, the Hirogen are roughly technologically equal to Starfleet, though have a primitive social structure, where each pack is led by an "Alpha", with a "Beta" serving directly under him.
The Hirogen view all other races as prey, and make sport of pursuing what they deem worthy adversaries. With this in mind, some far-seeing Hirogen believe their society, which has broken up into a number of factions each engaged on their own hunts, has become too divided to survive in the hostile Delta Quadrant.
Hirogen are typically much taller than a human, perhaps seven to eight feet in size. They are powerfully muscular. It can be surmised that their close combat capabilities outstrip those of a typical Starfleet officer by quite a margin. Hirogen hunters of all ranks wear tough blue armour, generally with face masks. Before a hunt, all Hirogen hunters colour their faces with some type of war paint.
 Human (Augment)
Augment is a term used to describe a group of genetically engineered Humans created by DNA resequencing in the late 20th century, a group of Klingons, and other genetically-engineered beings. (Those from the 20th century were also called supermen.) The Augments were designed to be stronger, faster, and more intelligent than a normal Human being. Even their resistance to energy weapons was improved, as it took multiple shots with a phase pistol to stun one.
Hunters are a species who live in the Gamma Quadrant. They are part of the Dominion, serving as navigators and trackers. To hone their skills, Hunters engage in lifelong pursuit of another, related species, Tosk. Hunters value a long, challenging hunt, preferably ending in the Tosk's heroic death. If they manage to capture a Tosk alive, they will reluctantly take it back to their homeworld and subject it to ridicule and public display. Following a hunt which was briefly interrupted on Deep Space Nine, the Hunters declared it (and the entire Alpha Quadrant) off limits for future hunts.
The Hur'q are a species that conquered the Klingon homeworld, Qo'noS (Kronos) about 1,000 years prior to the timeline of Star Trek: The Next Generation. Their name is the Klingon word for "outsider" and is probably not their own name for themselves. The Hur'q plundered Qo'noS, stealing the revered Sword of Kahless. They apparently originated in the Gamma Quadrant, and may have travelled through the Bajoran Wormhole to reach this part of the galaxy. The Hur'q have never been seen on Star Trek, and are believed to be extinct.
The Hur'q invasion of Qo'noS was said to be the first most serious threat to the Klingon people in their history, the second being the Augment virus (Affliction), followed by the explosion of Praxis, the moon of Qo'noS.
The Iconians were a highly advanced ancient culture that was destroyed around 200,000 years ago by orbital bombardment that destroyed the surface of their planet, however some may have escaped through a device known as the Gateway, which is capable of transporting a person hundreds of thousands of light-years in an instant. Legends refer to the Iconians as ..."demons of light and darkness", according to USS Yamato commanding officer Captain Donald Varley, who was almost obsessed with the Iconian legend.
Iconia, the home planet of the Iconians is located in the Romulan Neutral Zone near Romulan space. It was discovered by the United Federation of Planets in 2365 by Captain Donald Varley of the USS Yamato.
The Iconians were also mentioned in Star Trek: Deep Space Nine. Benjamin Sisko and company assisted Jem'Hadar soldiers in destroying a second gateway. This episode marked the first appearance of the Vorta Weyoun.
In the 2001 crossover novel series Gateways, the Iconians returned after a long absence, introducing chaos across the galaxy by opening all their Gateways and auctioning the entire network to the highest bidder.
The idea of the Iconians bears a resemblance to that of The Ancients of the fictional Stargate universe. Both races used gateways for instantaneous interstellar travel. Both are described as ancient, advanced, mythological cultures having vast empires.
Ithanites are a member of the United Federation of Planets in the 26th century of the fictional Star Trek universe. Ithanites are one of the species that serve on board the USS Enterprise (NCC-1701-J) and play a hand in the Battle of Procyon Five, in which the Federation defeats the Sphere Builders.
The Kadi are a humanoid species that live in the Delta Quadrant. They are a deeply spiritual people; shunning everything from entertainment to spicy foods. In their culture, males and females work separately. The Kadi bathe with pure water only, and observe prayers eight times each day. The ritual greeting upon entering unfamiliar territory is to say "Travelers who have left the sanctity of their home and family, we welcome you to our home; our family." The Kadi were featured in the Star Trek: Voyager episode "Someone to Watch Over Me."
The Karemma are a humanoid civilization native to the Gamma Quadrant, and members of the Dominion. Similarly to many other Gamma Quadrant species, they have only made appearances in Star Trek: Deep Space Nine. In 2371, Federation agents onboard the USS Defiant, came together with First Minister Ornithar of the Karemma in an attempt to contact the Dominion. This appointment has been made by Quark, who worked as an ambassador of the Ferengi to the Dosi and the Karemma. (DS9: "The Search")
In 2372, a Karemma ship commanded by Hanok was intercepted by the Jem'Hadar while conducting trade relations with the USS Defiant. All of the ships entered the atmosphere of a gas giant, where the badly damaged USS Defiant was able to destroy the two Jem'Hadar attack ships and rescue the Karemma transport. (DS9: "Starship Down")
Kaylar are featured in the Talosian flashback/fantasy created by the Talosians for Christopher Pike in "The Cage", and reappearing in "The Menagerie (Star Trek)". A confrontation between the Kaylar and members of Pike's landing party on Rigel VIII led to seven injuries and three deaths among the latter, including Pike's yeoman. The male Kaylar warrior in "The Cage"/"The Menagerie" was played by Mike Dugan.
See also Trabe. Delta-Quadrant species featured in Star Trek: Voyager. Technically unadvanced species used for many years by the Trabe as slaves until they rebelled and took over Trabe worlds, ships, and technology. Divided into several sects each led by the "First Maje," they are a distinctive looking species with facial ridges and elaborate hair and head-dress.
Klaestrons are distinguishable in appearance by an ear ridge that comes forward to the eye, raising the hairline over the ear. In Klaestron society, males and females are considered equals.
The Kobali are a tall, bald, ash-purple species found in the Delta Quadrant. They procreate by taking the corpses of other races, reanimating them (which usually results in severe memory loss of their previous life), and altering their cellular structure so as to make them entirely Kobali. Such changes are very difficult, if not impossible, to reverse - even on a cosmetic scale. They appear to be a (at least medically) technologically advanced warp-capable species. Very little is known about their physiology, other than that they have a mutispheric brain and are considered quite intelligent (compared to humans). Their language is very complex and robust, their central motto is "Do not harbor ill-will towards those who brought you death, for they gave you the chance to live again."
Kolarans are a humanoid pre-warp civilization located on Kolarus III. These humanoids live in isolated pockets at an early stage of industrial development, comparable to mid-20th century Earth.
In 2379, the Kolaran natives encountered an armed away team from the USS Enterprise-E that had invaded their territory to salvage the android B-4. The natives attacked the away team, but the team's highly superior technology allowed them to escape unharmed. (Star Trek Nemesis)
A race of aliens who have fought the Klingon for centuries, they appear in the Peter David novel Strike Zone, fighting for Cognocenti weapons. Since Star Trek novels are not considered part of 'official' Star Trek history, the Kreel are considered non-canon.
Kreetassans were one of the first races encountered by Captain Jonathan Archer and his crew on Star Trek: Enterprise. However, the contact did not go well: While being led on a tour of the ship, the Kreetassan delegation abruptly turned tail and left in a huff. The Enterprise crew quickly learned the reason: In Kreetassan culture, the simple act of eating a meal is viewed as an intimately private ritual, similar to mating. When the Kreetassans saw the Enterprise's mess hall, they were so mortified by the sight of many humans eating meals together, that the first contact between the two species was abruptly cut short. (Episode "Vox Sola")
Later, the Enterprise visited the Kreetassan homeworld - inadvertently causing another incident when Captain Archer's dog, Porthos, relieved himself on a sacred Kreetassan tree. Captain Archer, to save face, was forced to perform an elaborate ritual of apology (mainly involving cutting pieces off the tree and arranging them in an intricate pattern) to the Kreetassan government. The Enterprise needed a machine part for their warp engines, but the Kreetassan government was so impressed with Archer's apology ceremony because he did it with such style, they gave the Enterprise two replacement parts. (Episode "A Night In Sickbay")
The Krenim Imperium is a technologically advanced race in the Delta Quadrant. Their military revolves around temporal based weapons that distort the space-time continuum. Armed with Chroniton Torpedoes, Krenim Warships are able to take on even the most well armed vessels. Being out of sync with normal space-time, the torpedoes can penetrate any conventional shielding. One example of the advancement of the Krenim is the Temporal Weapon Ship that was commanded by Annorax. With a single shot from its temporal core, the ship could easily alter history; destroying an entire species or a single molecule. The Krenim were the featured antagonists of the Star Trek: Voyager episode "Year of Hell".
Ktarians are an alien species native to the Alpha Quadrant. They are recognized by their catlike eyes and large frontal skull bones. Ktarians mature much faster than other species of their region of space - Naomi Wildman, half Ktarian, appeared to age at over double the rate of humans.
In 2368, a Ktarian plot to take control of Starfleet (episode The Game ) was uncovered when a mercenary named Etana Jol was captured while attempting to spread a mind-controlling device throughout the fleet. Since the Star Trek: Voyager episode "The Voyager Conspiracy" confirmed that the Ktarians are members of the Federation, it is unclear why they would do such a thing, although it is also unclear exactly when they became Federation members (and exactly who Etana was actually working for). "The Voyager Conspiracy" does mention that the Ktarians sympathize with the Maquis, however.
The seventh planet in the Ktarians' home star system is used by their race as a sacred burial ground - Ktarians will lay thousands of stones on the graves, each stone representing a special prayer. While visiting this world, Chakotay once accidentally desecrated a grave by removing one of the stones.
Ktarian cuisine is also well known throughout the galaxy. Noted Ktarian desserts include the Ktarian chocolate puff and spice cake; Ktarian eggs are highly sought after as a breakfast dish. (Star Trek Generations)
The name of the Ktarian homeworld is Ktaris. Naomi Wildman once built a model of the planet for a school project while on Voyager. (episode "Child's Play")
Lurians are a large humanoid race known for their voracious appetites, perhaps due to the fact they have two stomachs.
Although little is revealed about the Lurian homeworld on the show, it was implied Lurians are usually found near the Hyundite Nebula.
The Lurian government is a monarchy.
Morn also appeared in the pilot epiosode of Voyager and in the Birthright crossover episode of TNG, so Lurians actually appeared in 3 series.
The Malon are a technologically advanced humanoid species in the Delta Quadrant.
Their homeworld is Malon Prime. It is supposedly a very beautiful planet, but kept that way only because the Malon dump all their industrial "contaminated antimatter" into space. This dumping comes at a high cost: the regions of space contaminated by Malon waste become uninhabitable. While it is thus official Malon policy to dump waste only in uninhabited space, some "waste export" captains have been known to cut corners by deliberately dumping close to inhabited space. The Malon also regard adverse, unintended consequences of their dumping, such as accidental discharges of radioactive material, as simply the cost of doing business.
In addition, the salary for waste export vessel crew members, especially "core laborers" who work directly with the waste storage tanks, is extremely high to match the attrition rate due to death by radiation exposure. Crew members who sign on for just one export mission, even if they do not die, may still suffer severe, progressive, and incurable sickness from the "theta radiation". (Under Malon law, if any crewmember dies from sickness incurred in the line of duty, his or her family is compensated for the loss.) The Malon tell legends of "Vihaar," monstrous life-forms created by the radiation that haunt, and attack, Malon ships. In reality, Vihaar are export vessel crew members so sickened and deformed by the radiation that they have been driven insane ("Juggernaut").
The starship USS Voyager had several encounters with the Malon, and at one time even offered to give them Federation treatment technology to make the waste harmless, or even beneficial. However, this offer was initially refused, as such an advance would essentially make the waste export industry, a key sector of the Malon economy, obsolete. It is unknown whether the Malon ultimately adopted clean technology. There has been no formal contact with the Malon government as such, merely a series of accidental encounters with their ships. Since these encounters have occurred over thirty thousand light years apart, it is possible that Malon territory extends across these kinds of distances - making their space far larger than the Federation. However, the Malon are known to have access to at least one stable "spatial vortex" - apparently a form of wormhole. It is possible that they have access to others which allow them to cross large distances, or even that they are able to build such phenomena themselves.
The Mari are a telepathic species indicative to the Delta Quadrant. When last seen, they had a near-utopian society. They found that violent thoughts lead to violent actions, so they made having such thoughts illegal. This created an underground black market of violent thoughts. The current situation on the Mari homeworld is unknown.
The Mazarites are a humanoid species native to the Alpha Quadrant planet Mazar. They are distinguished by two folded skin flaps on the sides of their faces that run from their eyebrows and surround their ears and under their temples. Mazarites also have dark hair with streaks of white hair swept back from the temples, along the sides. And at least in males, it is usually worn pulled back into a ponytail. In 2152, Mazarites were slightly more technologically advanced than humans, with starships that could reach approximately warp 5.2, with deflector shields and communications jamming technology, but apparently no transporter technology. Mazarites appeared in two Star Trek: Enterprise episodes: "Fallen Hero" and "Affliction".
The Medusans are a highly intelligent, incorporeal species and member of the United Federation of Planets. Their first appearance was in the Star Trek: The Original Series episode "Is There in Truth No Beauty?".
The Medusans are some of the few (if not the only) incorporeal beings that are active members of the Federation. Because of their different structure and correspondingly different sensory systems, they are much better suited for space travel than most members of the Federation. However, it is very difficult for the Medusans to interact in a meaningful way with the mostly-humanoid Federation. This is due to the fact that the Medusans have not completely shed their physical form and must always have it with them. This physical form is said to be so hideous that a humanoid viewing it without protection will be driven hopelessly insane. An interesting side note is that while the Medusans' body is grotesque in the extreme, their advanced minds - when viewed by those with telepathic abilities - appears to be quite beautiful.
The name came from the ancient Greek mythology where Medusa was originally a beautiful woman until she had intercourse with Poseidon in Athena's temple. She was changed into a hideous Gorgon as punishment; subsequently, her gaze would turn men to stone.
The Mekhar are a species of the Delta Quadrant. They are thrill seekers, often venturing into space alone (although sometimes as a pilot-navigator team) for extended periods.
Pronounced 'Maynk', they are one of two humanoid species from the planet Valakias. The Menk are less evolved than Valakians, they are similar in appearance much like how humans were similar in appearance to Neanderthals. The Menk were up on land were nothing could be grown by the Valakians. While the Valakians have ships that have already left their solar system, the Menk were still living in huts. The Valakians may have put the Menk in barren ground, they give them clothes, food, water and everything they need. While the Valakians began to die of a genetic disease, the Menk began to evolve. Dr. Phlox said that in two centuries the Valakians would be extinct, but he also noticed that the Menk were evolving and soon would become the masters of Valakias. The Menk appeared in the Enterpise episode, Dear Doctor
The Metrons are a highly-advanced species appearing in Star Trek: The Original Series in the episode "Arena". They forced Kirk and the Gorn captain of the ship the Enterprise was pursuing to fight each other, in punishment for violation of their space.
A race ruled by a paranoid dictatorship. Appears in the Voyager episode Resistance.
Seen only briefly at the beginning of The Next Generation episode "Eye of the Beholder", Lieutenant Daniel Kwan was half-Napean with a human father. Napeans are partially empathic and can be distinguished by cartilage that extends from the top of the nose up between the eyes and widens slightly as it extends to the top of the forehead. Though only seen in one episode of the television franchise, Napeans have appeared in several Star Trek novels and in the game Star Trek: Elite Force II.
Nausicaans are a strong and typically violent race. The name appears to be an allusion to Nausicaa from Homer's Odyssey, a woman whose name means "burner of ships." This may also be a continuation of a tradition (which began with ST:TNG) of incorporating subtle tributes to Japanese manga and animation; Nausicaa of the Valley of the Wind was a manga and later an animated feature by acclaimed director Hayao Miyazaki.
In the 22nd century, before the founding of the Federation, Nausicaan pirates were a significant threat to human freighters, and the early Starfleet spent much of its time on watch for Nausicaan pirates. This included a raid on the ECS Fortunate, a civilian cargo freighter, in 2151. This was detailed in the Enterprise episode "Fortunate Son".
In 2327, a young ensign Jean-Luc Picard was stabbed in the back by a gang of three Nausicaans in a bar fight at the Bonestell Recreation Facility at Starbase Earhart, requiring the replacement of his heart with an artificial one. This event was depicted in the Star Trek: The Next Generation episode, "Tapestry," in Season 6.
Nausicaan culture includes a concept of warrior-spirit referred to as "garumba", which one Nausicaan accused Tom Paris of lacking. Contact between Nausicaans and other species such as humans in bars or similar environments is likely to lead to brawls or duels, so prudent humans avoid them.
The Neyel are first mentioned in The Sundered by Michael A. Martin and Andy Mangels (August 2003), set in 2298 aboard the USS Excelsior. They are again mentioned in Taking Wing in which they are mentioned as being offshoots of Earth-bound Humanity who inhabit the Small Magellanic Cloud The Neyel are also featured in the Star Trek: Titan novel The Red King.
Originally surface dwellers and the dominant species of their homeworld, the Ocampa exhibited phenomenal mental powers far in excess of any similar race in Star Trek canon. Their amazing mental abilities were offset, however, by their extremely short nine-year lifespan, less than that of dogs. This is in marked contrast to the usual practice of making alien races longer-lived than humans.
The development of the Ocampa race was interrupted when an exploratory vessel from another galaxy chose to visit the Ocampa homeworld. The propulsion system of the intergalactic vessel caused an irreparable chain reaction in the atmosphere of the planet, destroying the ability of the atmosphere to carry on a rain-cycle: according to Captain Kathryn Janeway, the planet's atmosphere was "completely devoid of nucleogenics". The intergalactic explorers, upon realizing their mistake, took upon themselves the responsibility of taking care of the Ocampa. The Caretakers built a massive underground cavern with access to the only remaining natural water source on the planet, and supplied it with energy via transmissions from a gigantic orbiting station. From this station, the "Caretaker" dutifully watched over the Ocampa, supplying every need and protecting them from every danger. As a result of this life of absolute ease, the Ocampa eventually stopped using their mental powers and, due largely to their short lifespans, eventually forgot about them completely. Over time, the Ocampa became completely dependent upon the Caretakers for all necessities of life.
The Ocampa remained in this state until the only Caretaker remaining on the station began to die. This Caretaker reasoned that only his own offspring would be able to carry on his work of protecting the Ocampa, and so began a galaxy-wide search to find a genetically compatible race through which it might produce offspring. This search consisted of a long series of trans-galactic ship-jackings, which is how the Federation Starship Voyager came to be in the Delta Quadrant.
 Pah Wraith
Pakleds are short, stocky humanoids with large bushy eyebrows. They are fairly simple-minded, but they keep pace with the capabilities of other spacefaring races by stealing technology (such as shields of Romulan design) from ships they encounter.
Pakleds tend to over-emphasize their simple-mindedness to their benefit: their simple and childlike speech ("We look for things. Things that make us go. Can you make us go?" "We are smart, we are strong!!") leads their victims into thinking the Pakleds are harmless and helpless; the Pakleds request help from the target ship, wait until their benefactors' guard is down, then use a show of force to take what they need.
The Pakleds were first seen in the TNG episode "Samaritan Snare". In the episode "Brothers", Lore comments that after being reassembled he drifted in space until picked up by Pakleds. Several Pakleds appeared as background characters on Star Trek: Deep Space Nine. In a deleted scene from Star Trek Nemesis, the android B-4 commented that some Pakleds had rescued him from Omicron Theta and made him work for them for a few months before they dumped him, finding that he was useless even by their low standards.
In the fictional universe of Star Trek, the Preservers are an ancient race of aliens who visited Earth thousands of years ago and removed some human specimens from the planet. The aliens then "seeded" these humans on other planets within the galaxy that had similar Earth-like environments.
No one is sure why the aliens did this, and most speculate that it was part of a great experiment to test the adaptability of humans, whom the aliens believed would one day serve as their replacements. It appears that the Preservers themselves were a dying race and no longer exist. The only evidence of their culture are ancient artifacts and ruins that litter various humanoid worlds. Many races that have been encountered have a sketchy pre-history, some unable to explain their sudden appearance on their worlds, while other cultures have clearly documented evidence that they are not native to their home planets.
The Preservers are discussed explicitly in the Star Trek: The Original Series episode "The Paradise Syndrome", in which Preserver technology inadvertently (and temporarily) erases Captain Kirk's memory, and the amnesiac Kirk settles down in a Preserver-seeded society of Native Americans. Although popular in fan fiction, the Preservers are never again featured in explicit canon.
In William Shatner's novel Preserver, the Preservers are said to be responsible for other duplicate Earths (such as Miri's homeworld) and transplanted human civilizations (Magna Roma of "Bread and Circuses", Omega IV from "The Omega Glory") seen in the original series.
The idea that the Preservers are the "Ancient Humanoid" aliens, first mentioned in "Return to Tomorrow" and featured in the Star Trek: The Next Generation episode "The Chase" is uncertain and debated amongst Star Trek fans. Although their "seeding" actions seem to parallel that of the Preservers, the Ancient Humanoids may in fact be a different culture entirely, as they were active billions of years before the actions of the Preservers. Screenwriter of "The Chase" Ronald D. Moore has stated they "could be them and be internally consistent."
The Selay are a snake like species, who have had numerous conflicts with the Anticans.
The Sheliak are a non-humanoid species - classification R-3. The Treaty of Armens, 500,000 words in length, maintains peace between the Sheliak and the Federation. The Sheliak apparently regard humans as a lower species, and refuse to have any contact with the Federation beyond what is necessary to enforce the Treaty of Armens. They have a stubborn insistence on protocol which Jean-Luc Picard has used against them. Sheliak colonists being transported to a new planet are referred to as a "membership".
The Sheliak inhabit types of planets that humans normally do not, e.g. H-Class worlds with levels of radiation that would be fatal to most humanoids. Sheliak appear vaguely humanoid, but with a dark, very rough skin and few identifiable features.
 Species 8472
 Silver Blood
Y-class planets, also known as Demon-class planets, are the most inhospitable to known humanoid races. On one such planet located in the Delta Quadrant, even though the surface temperature was ridiculously hot, an away team of Tom Paris and Harry Kim found a small pool of cool, viscous silver liquid. It was found that it created a perfect copy of any organic matter it came in contact with. Perfect, except for the fact that it still needed to breathe the indigienous gases of the planet. Before it had copied Tom and Harry, it had never known sentience, and now it wanted it badly. So badly that it was willing to destroy the USS Voyager and all the "originals" in order to copy them. Janeway convinced them to let her crew continue on its way if she let them copy the Voyager crew.
In a later episode, we see that the Silver Blood-copies forgot that they were just copies, created an entirely new Voyager out of silver blood, and were trying to make their way back to Earth just like their original counterparts. However, they made some adjustments to their warp core, causing their Silver Blood bodies to deteriorate, as did the ship. They tried to find a new Deamon-class planet to set down on, but the miners on it wouldn't let them near it, and they weren't in any shape to put up a fight about it. The last surviving crew member, Harry Kim (who was the first one to get copied, oddly enough), and the rest of the ship completely deteriorated mere moments before they were to meet up with the real Voyager.
 Tak Tak
The Tak Taks live in the Delta Quadrant and have a method of communicating not only involving spoken words but also ritual gestures. They are very set in their ways, and if someone makes rude gestures (such as putting their hand on the hips) they become very violent.
The Takarans are a humanoid species native to the planet Takara.
Takarans are characterized by a very unusual anatomy and physiology where their internal organs are not as distinct as those of most humanoids – their organ systems are much more evenly distributed around their bodies, resulting in Takarans having a very high resistance to injury. Takarans also have voluntary control over their own physiology down to a cellular level and can place themselves in a form of stasis resembling death.
To Starfleet medical equipment, only the rate of cellular decay could verify whether a Takaran was dead or alive – a slow rate of cellular decay was indicative of a Takaran in voluntary stasis; the rate of cellular decay would be much faster if the Takaran were truly dead – this was unknown to Doctor Beverly Crusher until 2369.
Takarans are also able to put only a part of their body in stasis at a time, enabling them to slow injury in specific areas and thereby reduce the overall effects of the injury. (TNG: "Suspicions", episode 248)
NOTE:Since Dr. Crusher knew little of Takaran physiology and also stated Jo'Bril was the first Takaran she'd ever met, it is unlikely that Takarans were Federation members as of 2369.
Talarians are a humanoid race with a homeworld in the Alpha Quadrant. Their society is patriarchal and competitive. They were only featured on screen in the Next Generation episode Suddenly Human, but referenced in a few others.
The Tamarians are a bald, orange, humanoid species of the Alpha Quadrant who speak primarily (if not entirely) by metaphor. Their metaphoric language is based on the Tamarian ancient history, making it virtually incomprehensible to anyone without background knowledge of the history. It is also inferred that they have limited, or no, concept of individuality. They are an advanced species capable of space travel, though to what degree is unknown.
The Tandarans are humanoid species native to Tandar Prime, occupying several worlds in the Tandar Sector. They are physically almost indistinguishable from humans, except for a circular wrinkle between their brows. In 2152, they had been at war with the Suliban Cabal for over 8 years, and had placed all Suliban civilians living in their territory into concentration camps. Tandarans appeared in the Star Trek: Enterprise episodes "Detained" and '"Two Days and Two Nights".
The Tarkan are a Delta Quadrant species which, according to the Mekhar, are so curious that, if they see an unfamiliar ship, they will detain the ship and put it up on display and capture and study (by dissecting, from the sound of it) the crew.
Thasians are an incorporeal race believed to be native to the planet Thasus. In 2266, the USS Enterprise (NCC-1701) encountered them after it retrieved a young man, Charles Evans, from a ship that had rescued him from Thasus. Evans soon displayed extraordinary abilities, and the Thasians were forced to retrieve him and return with him to their home world. Extrapolating from the abilities they granted Evans, Thasians are telepaths and can materialize, restructure and disintegrate matter at will. They can project themselves across short distances of space and they can travel through space in a glowing construct analogous to a space vessel. They can confer psionic ability on other beings (as they did with Evans) but either cannot or will not remove that power. The only individual seen so far appeared as a large floating head that rippled and wavered. It stated that it had taken that form centuries ago so that it might communicate with humans; this is unlikely to be the race's true form.
Torothans are a humanoids species native to the Beta Quadrant planet Toroth, with a clan-based society. A member of the Torothan clan was identified by facial markings consisting of two pairs of line. The outer pair began at each end of the lips and curve inward towards on the chin. The inner pair begins separately near the center of the bottom lip and intersects about midway, becoming one line which intersects the two outer lines on the chin. In 2152, their society was rent by a civil war. Torothans appeared in the Star Trek: Enterprise episode: Desert Crossing.
Tosk are a reptilian humanoid species from an unknown planet in the Gamma Quadrant. Tosk are bald and covered in green scales, the only information Tosk give about themselves is saying 'I am Tosk'. Tosk are hunted by an unknown race, which is similar in them in appearance but have hair.
The Trabe were at one point a major power in the Delta Quadrant. They were brutal slave masters ruling over the Kazon race, until the Kazon revolted. All Trabe technology and spacecraft - even their homeworld - were all stolen by the Kazon. The Trabe have been reduced to wanderers, constantly pursued by Kazon fleets and unable to settle on any permanent planet for fear of being exterminated by the former slaves. The Trabe attempted, with Kathryn Janeway's assistance, to make an alliance with the Kazon in "Alliances", but were unsuccessful due to the Trabe's secret attempt to kill the Kazon majes.
Mentioned in dialogue in a couple of episodes of Deep Space Nine, the Tzenkethi are a spacefaring race in the Alpha Quadrant. Their government is formed of several member star systems and is known as the Tzenkethi Coalition. The planet is called "Tzenketh". Ruled by autarch caste system. The principal change of government is via the "coup d'état". A persistent rumor in fanon is that the Tzenkethi are the same race as Larry Niven's Kzinti but no evidence has been found to support this.
According to Geoffery Mandel's Star Trek Star Charts, The Tzenkethi homeworld orbits a red dwarf.
Vaadwaur appear in the Star Trek: Voyager episode "Dragon's Teeth" (Season 6, Episode 7). The Voyager crew takes refuge on a planet that appears to be experiencing a nuclear winter. The crew discovers that there are stasis pods and revives the inhabitants who claim that they are the Vodwar.
The Vodwar are reptilian in appearance and appear on the surface to be physically similar to the Cardassians; they have a pale, grey skin and pronounced neck ridges. They are an expansionist military culture that controlled areas of the Delta Quadrant. They are said to have used subspace corridors to travel great distances and surprise other species with sneak attacks. They also seem to be a duplicitous race in that they will agree to certain conditions with another species and then go back on their word. No wonder then, that the word "vodwar" in ancient Talaxian means "fool" - in the sense that it is foolish to trust such an enemy, despite common goals.
After an armed conflict, 53 ships of the Vodwar managed to have escaped the planet they were on and entered a subspace corridor. Even though Seven points out to Captain Janeway that their technology is effectively 900 years behind the times, Janeway sees this race as being extremely adaptable and aggressive; traits that could help them establish their hold on regions of the Delta quadrant.
Vorgons visit the planet Risa in the Star Trek: The Next Generation episode "Captain's Holiday", claiming to be security personnel from the 27th century on a mission to secure a dangerous artifact known as the Tox Uthat. In reality, they were thieves attempting to steal the massively destructive device.
Humanoids with vagely fishlike faces, Vorgons appear to have something like gill slits where most humanoids would have a nose. Embedded in the upper portion of their heads are touch-sensitive devices which permit them to teleport (and possibly to time travel).
Vorta appear in Star Trek: Deep Space Nine. The Vorta serve the Dominion's Founders, whom they worship as gods, in administrative roles. They typically serve as diplomats or as officers charged with managing Jem'Hadar units. This function is somewhat similar to political officers. The presence of a Vorta typically denotes Dominion interest in, or involvement with the given situation.
Vorta are humanoids with white skin, black hair and lilac-colored eyes. They have good hearing and poor eyesight in comparison to humans, and are immune to most forms of poison. The Vorta also have a very poorly developed aesthetic and sensory taste. About the only things they can taste are certain food items from their home world. According to Weyoun 6, the Vorta were once a simple arboreal species that the Founders genetically reengineered. The Vorta believe that the Founders are gods as a result of this genetic engineering.
The Vorta reproduce by cloning. Unlike the unisexual Jem'Hadar, there are both male and female Vorta, although it is not specified whether the Vorta are actually capable of sexual reproduction.
While only a single telekinetic Vorta is seen, Eris claims that limited telekinesis is a trait of her species. As she was otherwise being deceitful at the time, this assertion is questionable. (DS9: "The Jem'Hadar")
Vorta have a suicide device implanted at the base of their skulls. If a Vorta needs to take its own life, he or she can activate the device and be dead within seconds. Although Vorta are told it is a painless process, actual practice suggests otherwise. (DS9: "Treachery, Faith, and the Great River")
Vorta are purposefully engineered to be immune to poison, a fact demonstrated by Weyoun who gulps down a deliberately poisoned bottle of Kanar and then boasts about his immunity. "It helps when you are a diplomat." (DS9: "Ties of Blood and Water")
Little is known about the Vorta's history. According to Weyoun 6 in "Treachery, Faith, and the Great River", the Vorta have a legend that they were a primitive ape-like species until a Founder crashed on their planet. The Vorta helped the Founder, and in turn the Founder promised that they would one day be an important part of a great empire. The Founders then helped the Vorta through genetic manipulation.
The Voth are a reptilian humanoid species descended from Earth's dinosaurs, most likely a Hadrosaurid. The Voth escaped Earth when the environment was wrecked by an asteroid impact 65 million years ago. They travelled across the galaxy, eventually settling in the Delta Quadrant. The Voth are extremely advanced technically, possessing transwarp drive systems.
Voth territory seems to be in close proximity to Borg space. The Borg have been able to assimilate individual Voth (see the Voth page of Memory Alpha), but the technology of the Voth civilization seems at least as advanced as that of the Borg, and (given the relative ages of the two species) may be considerably more advanced. Whatever the case, they have obviously managed to avoid wide-scale assimilation. The Voth's contact with the Borg may have contributed to their strong antipathy towards mammalian humanoids.
As a society, the Voth are dogmatic recluses who have spun a fictional story ("The Doctrine") about their own past in order to create social cohesion. Although they have been away from Earth for 65 million years and have achieved much technologically, they have never been able to establish a permanent planetary home. The Voth have at least one enormous city ship for housing their government.
In the 24th century, the Voth leadership threatened to destroy the crew of Voyager and a rogue Voth scientist, if they refused to disavow evidence that the Voth originated on Earth. This was the so-called "Distant Origin" theory. At the close of contact between the Voth and Humans in the 24th Century, it was not considered hopeful that the two sister species would reunify anytime soon.
The Wadi are a race from the Gamma Quadrant who first appeared in Star Trek: Deep Space Nine. They are Human-like, with black markings on their chins and/or foreheads. The Wadi have a huge love for games. One game, consisting of 5 "shapps", or levels, somehow gets Cmdr. Sisko, Kira, Jadzia Dax, and Doctor Bashir actually playing the game by being the pawns. The Wadi appear in the episode Move Along Home.
Xaranite are a reptilian humanoid species, they are never fully seen, but have green scaled faces. Xaranites work for the Cardassians as smugglers. It is possible that Xaranites are a subjugate species of the Cardassian Union, which may explain why a Xaranite captain allowed Sisko to search his cargo when Gul Dukat ordered him to.
Xyrillians are a bald humanoid race, covered in dark orange scales, they have larger more pronounced scales on their cheek bones. Xyrillians appear in the Enterprise episode, Unexpected
The Yridians were a warp capable race from the Alpha or Beta Quadrant. They were regarded as information merchants and smugglers and were generally considered devious and untrustworthy.
Mentioned only once in the Star Trek: Voyager episode "Before and After"; the Yattho was described as a race that had precognitive visions with "uncanny accuracy". They are native to the Beta Quadrant.
The Zaldans are a species that appears almost totally Human except for webbing between their fingers. In the Zaldanian culture, courtesy is viewed as an insult and is not tolerated. It is viewed as a way to mask true emotions and feelings. The Zaldans made their first appearance in the Star Trek: The Next Generation episode Coming of Age.
 Zetaran Life Forms
Seen in the original series episode The Lights of Zetar, the Zetarans once lived on doomed planet, Zetar. They went out into space and would kill people who would resist them. The Zetarans need solid species to live in, if you resist you will be killed. The Zetarans wiped out everyone on the library planetoid, Memory Alpha.
Zeons are a race which is almost identical to humans, they from the ringed planet Zeon. The Zeons are at war with the other species from their star system, the Ekosians. All Zeons on Ekos are treated like the Jewish people during World War II. Zeons appear in the Original Series episode Patterns of Force. The Zeons are a peaceful race, violence and their "warlike period ended dozens of generations ago." The Ekosians would later blame the Zeons for all their political, economical and other problems, and began trying to exterminate them.