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Alien Poster

A selection of alien species in the Animorphs series, as illustrated by Romas Kukalis. Click picture for more info.

This is a list of fictional alien species from the science fiction series Animorphs, in alphabetical order. Major species are in bold.

It is notable that some of these species are sentient life forms, while others are alien "animals;" many (particularly those of Visser Three's morphs) are never definitively classified in the books.



  • Anati: Little is known of the Anati or their homeworld; apparently a fleet of Yeerk ships disappeared around this planet, and Visser One was charged with overseeing the infestation of whatever race(s) lived there, with the punishment of death if she failed. Later on Taylor implies that the Anati situation has been badly handled, and indeed, Visser One's execution seems to indicate she failed.
  • Andalites are an alien race of grazers
  • Antarean Bogg: the first creature Visser Three was seen morphing into in The Invasion, and the one with which he kills and eats Elfangor. It is a hulking, two-legged creature with an impossibly bloated head, arm-length teeth, merged features, and thick tentacles for arms.


The Arn's physiology somewhat resembles that of birds (In old Norse, Arn means eagle). It is possible that the Arn were the galaxy's masters of biological innovation. This race created an entire ecosystem after an asteroid destroyed much of the life of their planet. The Arn then decided to shield themselves from any more such catastrophes by moving their settlements into the deep chasms caused by the disaster.

They created the Hork-Bajir in order to support the vast jungles of high-rise trees. The Arn also created the creatures of The Deep to ensure no intrepid Hork-Bajir enters the Arn settlements deep in the planet's chasms, known to the Hork-Bajir as 'The Deep'. The Arn controlled the murderous creatures with chips implanted in their heads, that allowed them to give the creatures simple commands. As mentioned by Aldrea, the Arn seem to be distantly related to the chadoo.

When the Yeerks invaded the Arn/Hork-Bajir world, the Arn denied the Yeerks any possibility of being made into Controllers, or any Yeerk acquisition of the Arn's advanced technology. The Arn achieved this by altering their body by making an already weak blood vein in their brain even weaker, so that when a Yeerk enters the brain, the vein will pop, thus killing the would-be host and controller. Upon realizing this, the Yeerks used the Arn for slave-labour and target practice and eventually exterminated them through mass murder, exhaustion, and starvation.

However, one Arn who played a major role in the battle for the Hork-Bajir, Quafijinivon, traveled to Earth on a stolen Yeerk light freight ship and studied and absorbed every human language. He found the Hork-Bajir colony and the Animorphs. There, Quafijinivon used a technique known as ixcila, whereby a dead individual's 'soul' or 'essence' would find a host and become alive again. In this case, that person was the Hork-Bajir nothlit Aldrea, Seerow's daughter. Quafijinivon solicited the Hork-Bajir and the Animorph's help, and they traveled to the Hork-Bajir world to help the dying Arn create Hork-Bajir in his lab.

Cassie, one of the Animorphs, has to share her mind with Aldrea's memory so they could find something. This also allowed them to read each other's thoughts and memories. Cassie learns all about Aldrea and her lover Dak Hamee, a seer in the Hork-Bajir race, who died when the Yeerks enslaved the Hork-Bajir. Aldrea had landed in the Hork-Bajir planet with her family and later became a Hork-Bajir nothlit.


  • B'Heeon: Appears only in Alternamorphs #1: The First Journey. Ax sees and identifies it in the jungle during the false-timeline Sario Rip. The B'heeon has a three-foot-wide sticky pink tongue. It turns out that this is a morph that Visser Three has. Due to this book being non-canon and written by a ghostwriter, it is doubtful that a "B'heeon" actually exists in the Animorphs universe, even though it may be the hidden creatures that lived in holes on the Yeerk home-world.
  • Bievilerd: A creature from the planet Ondar. It is described as almost being a living stealth bomber, completely jet black, with several large wings and a huge mouth.


  • Chadoo : small, tree-dwelling creatures of the Hork-Bajir home-world. They are featured in the book The Hork-Bajir Chronicles. They have two elongated arms, four stubby legs, skin flaps, are covered in feathers and are very quick and agile. It is Aldrea's second morph. Tree sap attracts them. The Arn are possibly related to them (when Dak Hamee decided that the Arn were large, colourful chadoos, Aldrea contradicted that they were just distant relatives).
  • Chan Wath : minor species mentioned only in The Ellimist Chronicles.


The Capasins are only seen in The Ellimist Chronicles. They resemble squids, with giant, bulbous heads dominated by glittering blue eyes, a beak-like mouth, and a number of thin, multi-jointed arms. They came across images of the Ketran Games and thought the games were real. Believing that Ketrans actually played with the evolution of species as if they were toys, the Capasins launched a crusade and wiped out the Ketrans in a display of military force the Ketrans were unable to match.

Capasin ships are described as having raked cylinders, an arched neck, and dagger points, with the dagger points presumably being the source of the Capasin beam weapons. They also carry a smaller "boat" which can be released from their belly.

Capasin armaments include a pale red beam weapon, similar to a heat ray, as well as a flechette weapon that launches clouds of sharp-edged metal hooks with a "sound like a volcano blowing."


The Chee are a fictional race of androids created by the extinct Pemalites, a race of pacifists. The word Chee means "Friend" in the Pemalite language.


The Pemalites created the Chee in their own image, using their highly advanced technology to create friends that they could play with. In their natural state, the Chee androids have a humanoid structure bearing the dog-like qualities of their creators. The Chee are completely incapable of violence or assisting with any activity that would lead to someone's harm, even in their own self-defense. Due to having been designed for operation on a planet with higher gravity than Earth, the Chee possesses immense strength, speed and durability, capable of withstanding low-energy Dracon beam attacks and operating in the deep ocean. They have extremely long life spans; Erek King, the first Chee the Animorphs met in The Android, was over 50 millennia old, remarking that he has been alive since Moses wandered the Egyptian desert. Because of their holographic ability, they are masters of espionage and often spy on the Yeerks to alert the Animorphs to their next plans.

When the Pemalites were attacked by the Howlers, and the quantum virus which destroyed their creators was released, the Chee fled to Earth, which had been previously visited by the doglike pacifists. With only a few Pemalites barely clinging to life when they landed, the Chee managed to bind those Pemalites' "essences" with those of several wolves; from this combination, the modern dog was born. The Chee went into hiding on Earth, passing as human beings, watching humans evolve alongside them. The Chee can be considered benevolent Doppelgängers, as they can alter their appearance to match that of anything they wish, living or not. They accomplish this by means of a hologram generator. Erek and the other Chee often aid the Animorphs by standing in for them whenever they must undertake long missions, where they will be gone from home for longer than a few hours.

There has been only one time when a Chee has ever killed a living being; in book #10, The Android, the Animorphs manage to capture a device that allows a Chee to alter its programming — the Pemalite Crystal, which is in fact a computer of such advanced design that it would theoretically be able to control every computer on Earth, presumably utilizing the existing world wide web, yet is only about the size of a marble or a pearl. When the Animorphs retrieved the device from the Yeerk-run Matcom facility, Erek was able to use it on himself and managed to save his friends from certain death at the hands of more than 25 human-controllers armed with machine guns and 25 elite Hork-Bajir warriors; he effectively slaughtered them in less than 10 seconds. The eternally vivid memory of this action - his android memory meaning that the horror and brutality of what he did to the Hork-Bajir would remain as fresh in his mind as it had been when he first committed it - so disturbed and disgusted Erek, that he restored the failsafes against violence in his programming after having saved the Animorphs' lives, vowing to never harm anything ever again. Marco, who was the one holding the crystal, eventually passed the crystal to Jake's dog, Homer, who cast the Pemalite crystal into the ocean, and no news of it has been heard since.


The Chee are described in Book 10 by Marco as "made of steel and something white," with "mouths almost like muzzles, clumsy-looking legs, and stubby fingers." When Erek hits the side of a passing bus, Marco sees "something that seem[s] to be made of patches of steel and milk-white plastic ( he is amazed that his friend was hit by a bus and walked away like it was nothing causing Marco to investigate further.) ." As a spider, Marco is able to see through Erek's hologram, and he describes the foot as "interlocking plates of steel and ivory," and the foot looks like a dog's paw. On the whole, Chee look like upright digitigrade robotic dogs, possibly resembling Greyhounds.


  • Dayang: They are a fairly unknown race of people. At least some of them are traders, and one of them found a Pemalite Crystal, though he did not know what it really was, and traded it to the Yeerks.
  • Desbadeen: Only a couple minor mentions of this race are given in The Illusion, where Tobias has a flashback of Elfangor's memories of a space battle, when Elfangor remembers seeing "a Desbadeen tanker in the distinctive figure eight design" on the view screen, and in Visser, when Visser One compares Visser Three's host body to "that of an Earth deer or horse, or a Desbadeen limner".
  • Djabala: small, six-legged creatures of the Andalite home-world. They have a rather simple physiology, and similar enough to Andalites' so that the djabala is the first creature that arisths (lowest rank) morph during basic training.
  • Dule Fansa: Visser Three morphs it in The Discovery. Marco describes it as looking like a skinnier, more muscular version of Barney the Dinosaur, with a face located where most species' chests are. It has the ability to fire orange cones from its four arms, which can cause mass damage. He is first seen morphing it in David's room.


  • Ellimist: The Ellimist is a creature that Ax says is all-powerful. He say he can make entire worlds disappear. The Animorphs first meet him in book 7 The Stranger just as they are about to be swallowed by a Taxxon. He then appears again in 13 The Change where he gives Tobias his morphing power back. He appears other time through the series as well, including 26 The Attack and uses them to fight The Howlers.


  • The Five: hunted the Venber to extinction, using the Venbers' melted forms as computer superconductors. After an encounter with the Andalites, the Five themselves disappeared completely.
  • Folk: mentioned briefly in The Ellimist Chronicles as a eugenic species that kills up to ninety percent of its own children. During a challenge set up by Crayak, the Ellimist fails to save their planet from an asteroid, which destabilized the planet's orbit until it fell into their sun's gravity well.


  • Galilash: A species native to the Hork-Bajir Homeworld, created by the Arn to prevent Hork-Bajir from crossing the zone of separation. The Galilash are fourteen feet tall, with green and red reptilian flesh and razored tentacles.
  • Garatron: similar in appearance to the (presumably) unrelated Andalites, with a few differences, such as lacking stalk eyes or a tail blade. They are also capable of instantaneously fast movement that far surpasses the speed of just about any Earth animal. They use a form of thought speech that is very fast and condensed compared to the standard form of thought speak, lacking any pauses between words or punctuation. They are capable of running on water as seen in The Weakness when a Garatron-Controller ran across the surface of a Yeerk Pool. The Garatron-Controller was killed by Marco in cobra morph, when he bit and poisoned the Garatron. The poisoned Garatron was surprised by the speed of the cobra. It is possible that the Garatron has an advanced metabolism that allowed the poison to spread more quickly than it would in a human.
  • Generational: mentioned only in The Ellimist Chronicles as being a "corporate life form" the Ketrans were familiar with. Each generation of theirs is numbered. (e.g. Generation 9561)
  • Gofinickiliast: a species mentioned in The Ellimist Chronicles.
  • Gorks: A species native to the Hork-Bajir homeworld, created by the Arn to prevent Hork-Bajir from crossing the zone of separation. The Gork are described as being three feet tall, but twenty feet across, they shuffle on twelve legs with snapping, extending mouths on all sides.
  • Graffen's Children: They resemble Gumby, and are very peaceful. They were wiped out by the Howlers.
  • Grasper: a species mentioned in The Ellimist Chronicles.


Gedds evolved on the same planet as the Yeerks. The Gedds are a primate-like species, with terrible vision and bad motor skills. They served as the first hosts for the parasitic Yeerks.

Gedds are described as being like Template:Convert yellow-eyed monkeys. For no coherent biological reason, the Gedds evolved with webbed toes and two legs, one leg significantly shorter than the other, restricting them to an inefficient limp. Compared to humans, they are slow, weak, and nearly blind, but they are capable of accepting a Yeerk, they are numerous enough to be infested (relatively) easily, and offer a young Yeerk the magic of vision.

Gedds and Yeerks evolved together naturally, and at some point, Gedds became the species Yeerks first learned to control as hosts. When the first Andalites arrived on the planet they were aware of the Yeerks' use of Gedds, but Prince Seerow, leader of the mission, felt this symbiotic relationship was understandable considering the Yeerks' weak natural forms. The books are not quite clear on the exact intelligence level of the Gedds, i.e., whether or not they can be considered sentient, although The Capture describes a Gedd as having feeling both fear and bewilderment, as well as having a name. As described in the Andalite Chronicles, Gedds are easily intelligent enough to speak Galard, although they find this physically difficult, and often lengthen (or even add in) Rs to their speech.

Gedd-Controllers were used in the founding days of the Empire, when, armed with knives, clubs, and a single Andalite handheld Shredder they slaughtered two dozen Andalite warriors and seized the Andalite ships stationed on the Yeerk homeworld to fly into the night. In these early days, any Yeerk considered important enough to have a Gedd host was considered very fortunate, but by the time the main events of the series took place, Gedd-Controllers were very low-level, as better hosts, such as Hork-Bajir and humans, were available.


  • Hawjabran: Members of this species also have the unusual characteristic of having a brain that is not centralized in one place, as the human brain is centered in the head; theirs is spread in bits throughout their bodies, which makes them useless as hosts to the Yeerks. Early on, the Yeerks who escaped from their homeworld attacked a Hawjabran ship and, finding them useless, allowed all six thousand inhabitants to die from a lack of life-support systems. Their freighters resemble the star-ship Enterprise from Star Trek, according to Aximili-Esgarrouth-Isthill (Ax).
  • Hayati: a species mentioned in The Ellimist Chronicles.
  • Hoober: Small ground creatures from the Andalite Homeworld that jump on tendrils and have bulging eyes.
  • Hork-Bajir



The Helmacrons are caught by Cassie's anteater tongue. Art by David B. Mattingly for the inside illustration of book 24.

The Helmacrons are about a sixteenth of an inch tall with humanoid bodies with another set of legs. Their heads are perfectly flat on top, with large green eyes sitting on them. Their faces come down from the top in an inverted pyramid to a hooked, barbed chin. Their mouthparts are insectlike, with gnashing sideways teeth. They dress in silver colored one-piece suits with turquoise or magenta collars depending on their ship. They are mentioned and/or present in book 24 The Suspicion, book 39 The Hidden, and book 42 The Journey.

Helmacron society[]

Helmacrons are tiny creatures. Female Helmacrons are dominant to male Helmacrons, holding the important military positions on a spaceship, while male Helmacrons have janitorial or guard jobs (prompting Marco to comment that they were "an entire species of Rachels"). The Helmacrons kill their leaders before promoting them to make sure the captain will never make an error in judgment and thus have to be executed for making mistakes (a philosophy that Marco found particularly disturbing because it actually made "a sick kind of sense").

Helmacrons have the unusual mental ability to transfer their minds to another when their bodies are destroyed. Therefore, one can never really "kill" a Helmacron mind, since it dwells within other Helmacrons. Despite this, the Helmacrons seem to be no wiser than if they had only one, or even no mind at all; despite their tiny size and relative weakness, they have inflated personalities and further inflated egos, constantly proclaiming that they will crush all other races even when their ships can be threatened by large bricks- on one occasion they even vowed to take control of "this vast expanse of huge blue fur" and then use it as a base when their ship was lost, apparently unaware that they were on Ax's fur, and of all the alien species in the Animorphs universe, seem to be the least mentally stable. It is possible that the fluidity of their minds is the cause of thisTemplate:Citation needed.

After the first Helmacron encounter, Marco and Cassie had given the male Helmacrons a pep talk, inspiring them to revolt from their slave-like existence. The subsequent revolt of male Helmacrons throughout their empire has ultimately destabilized their already shaky social order. When last they appear, the Helmacrons are well on their way to engaging a massive civil war between the sexes.

Helmacrons, or at least the males, do not have names; a male, whom Marco dubs "Wuss", did not even know the meaning of the word "name".

They have never apparently had any contact with the Andalites, as Ax was unaware of their existence, but they are aware of the Yeerks, with Visser Three regarding the destruction of a Helmacron ship as no great challenge, even mockingly referring to the damaged ship as 'cute' after he had destroyed it with a hand-held Dracon beam. They are also somewhat of a joke among the Yeerks, as Visser One mocks Visser Three's pride by saying he had been hanging around with the Helmacrons.


The Helmacron spaceship Galaxy Blaster is shaped like a baton, with three clusters of three long tubes at the far end and a fierce death's-head bridge at the front. It resembles a Romulan D'deridex starship from the television series, Star Trek, albeit a tiny one; when Cassie initially finds it, she believes it to be an old toy. Their second craft, Planet Crusher is similar in appearance.

They also possess a shrinking and anti-shrinking beam. In the books these are powered using the morphing energy of the Escafil device, but they can presumably be powered by other energy sources. When used against the Animorphs, it reduced Marco, Cassie, and Tobias (and later many others) to the same height as the Helmacrons, with Tobias being the same height as Marco and Cassie despite having started out smaller than they due to the Helmacrons shrinking everything to a specific baseline, simultaneously causing all morphing to be restricted to that baseline; when Marco and Cassie morphed flies, they were reduced to a size where they could see individual cells. However, new morphs acquired during this time frame would not be shrunk; when the Animorphs and Visser Three acquired and morphed an anteater to effectively battle the Helmacrons, the resulting anteaters were all normal sized (Although whether this would remain the case if it was morphed again remains unknown, as the anteater morph was never used afterwards).


The Attack Illustration

The first page illustration of The Attack, with David Mattingly's depiction of a Howler in the lower right corner. See also Romas Kukalis's art of a Howler here.

Howlers, or Crayak's Children, are the alien shock troops of the nearly omnipotent Crayak.


Howlers possess cracked black skin that resembles hardened lava; beneath the black, in the cracks and creases of the flesh, are bright, red lines. Humanoid in appearance, their bodies are split in two at the waist, and the two halves tethered together by elastic skin; this bearing allows them to turn their upper body all the way around and keep themselves in the fight permanently, even when thrown away. They have large, expressionless, robin's-egg-blue eyes that have the ability to make out major organs within their prey. The Howlers are fast learners and can easily adapt; when the Animorphs escape them using insect morphs, they counter by releasing insect poison into the room during a subsequent attack.

Their most fearsome weapon is the howl that gives them their name. The howl is modulated to affect the complex, intelligent brains of sentient beings, and will almost instantly disorient and cripple those who hear it. Howlers are very fast, extremely resilient and highly talented at combat. In The Attack, a single Howler was capable of fighting all six of the Animorphs in their primary battle morphs to a stalemate. Their super-fast regenerative abilities allow them to quickly overcome even the worst physical damage. The Howlers operate as a hive-mind; the experiences of any one Howler are shared amongst all of them, so that every single one may become the best possible combatant.

Behavior and Evolution[]

Being the tools of Crayak, this race's sole purpose is to travel through the universe and destroy peaceful civilizations. But while Howlers may seem brutal in their killings, the Animorphs discover that they are not a race of purely evil beings (a philosophical point of K. A. Applegate's), for they are in fact unaware of the severity of their actions; they seem to be unaware that the people they are killing are actually real, sentient beings capable of feeling emotions or pain. The Howler mind is, in fact, similar to the dolphin mind in its playfulness. The Howler collective memory means that any experiences of victorious combat are shared throughout the race, but it will also share any experience of defeat among them, something Crayak cannot allow, which is why no Howler has memory of ever having lost a battle; Crayak does not allow those memories to poison the collective pool. The species is manufactured, and a Howler lives for only three years of its childhood before dying.

Howlers in Animorphs[]

The Howlers are mentioned in the tenth book in the Animorphs series, The Android, when the Chee Erek King explains that it was the Howlers who destroyed the Chee's creators, the ancient, dog-like Pemalite race. The creatures are first featured in book twenty-six, The Attack, when Crayak and the Ellimist have a contest between seven of the species and the Animorphs, along with Erek when the Ellimist sought to protect a race called the Iskoort, who would play a vital role in the future. In the fight, Jake manages to defeat one Howler by tricking it into falling off a cliff – subsequently acquiring it during the fall – and the Animorphs subsequently manage to download their own memories into a Howler using Iskoort technology, causing the Howler to realize that humans and other species are, in fact, sentient beings with feelings and emotions. Crayak quickly destroyed the infected Howlers, to keep this information from reaching the collective memory. However, a single memory ended up getting through; a memory of Cassie and Jake kissing. The Ellimist informs the Animorphs that this, in effect, destroys the Howlers as a threat, as a memory of love makes them useless to Crayak. For Jake's role in this, Crayak has great hatred of him, and has worked harder to destroy him than the other Animorphs.

The Howlers are known to have wiped out several species, including the Nostnavay, Graffen's Children and most notably, the Pemalites. They can, in effect, be seen as the opposite of the Pemalites---who were created by the Ellimist to spread life---though both species, interestingly, are noted for wanting nothing more than to have fun.


  • Illaman: mentioned in The Ellimist Chronicles as a species known to the Ketrans.
  • Inner Worlders: a species of winged, multiple-eyed aliens that are in a long-standing conflict with the Jallians.
  • The Iskoort are a strange capitalistic race that live on a distant planet in the far side of the galaxy. They are a race divided into castes that live in guilds and spend their lives doing only what their caste specifies. For example, salesman Iskoort sell anything they can-even memories, skin, and hair. There are even Iskoort whose sole purpose is to buy goods in order to keep the economy going. They have torsos like an wheezing, veiny pink accordion, vulture heads, and legs that make them look like they're walking backwards. They are actually a combination of two races: the Isk and the Yoort. The Isk were artificially created, and engineered so that they cannot live without the Yoort. The Yoort, likewise, modified so that they can't live without the Isk, ensuring that neither of them rebels or abuses the other. The Yoorts were a parasite race much like the Yeerks and who also feed on Kandrona Rays. They, too, took over creatures as hosts and tried to conquer the galaxy, however, after a long while of being forced to enslave others to be free, they came up with a solution. They engineered special hosts that would be most suited to them and could not live without them. So that they would be true symbiotes, they altered themselves also, so that they and their host bodies, called the Isk, formed a single race, the Iskoort, who then built an orderly society on their new home planet. Their society is a strange mix of chaos and order, but they are very important in the fate of the galaxy. The Ellimist and Crayak wage their battle over them because in about three centuries, the Iskoort and the Yeerk will meet, and the Yeerks will realize that there is an alternative to their current lifestyle.


  • Jallian: a species of slug-like, multi-armed aliens in a long-standing conflict with the Inner Worlders. Their entire species is eventually destroyed by the Inner Worlders.
  • Jubba-Jubba: A species native to the Hork-Bajir homeworld, created by the Arn to prevent Hork-Bajir from crossing the zone of separation. Large and terrifyingly strong, three fingered creatures, the jubba-jubba are capable of pulling limbs from bodies with complete ease.


  • Kaa: Humanoid creature exclusive to Animorphs: Shattered Reality. They are armed with staff-like weapon for combat.
  • Kafit Bird: Andalite homeworld. There are only three species of bird, and the kafit is considered the best, with six powerful wings and a razor bill for a beak. In the early days of the Andalite-Yeerk War, training arisths acquired the kafit and flew around for amusement.
  • Kaftid: A creature from the Hork-Bajir world, with eight legs, a seahorse-like head, slimy skin, and the ability to shoot acid.
  • Kelbrid: aggressive yet trustworthy enemies of the Andalites mentioned only in The Beginning. Their powerful empire borders Andalite space, but neither side is allowed to interact with the territory of the other; as a result Andalites do not even know what the Kelbrid look like.
  • Korla: mentioned in Megamorphs #2: In the Time of Dinosaurs by Ax, who implies that they are rather odd-looking, as the Taxxons and Skrit are.


For the town in Armenia, see Getamej.

The Ketrans once lived in giant crystals hovering above a lava-covered planet. The Ellimist was once a member of this race, apparently one of the first technologically advanced sentient life-forms of the galaxy. The Ketrans were later wiped out by the Capasins.The Ketrans kept the floating crystals aloft by having many of them flapping their wings while attached to the crystal.

Ketrans are winged creatures who have 'quills' rather than hair. They have 2 arms, 4 eyes (ranging in colors like pink, magenta, aqua, black, etc. - similar to the colors described in their home crystals), 4 feathery wings, 2 'pods' of some sorts (possibly the Ketran equivalent of feet), docking talons, and are highly intelligent. The description provided by the author indicated they may appear as angels, which would fit in with their God-like powers over their games.

Ketran society is composed of many occupations like biologists, technicians, analysts, physicists, astronomers, and theoreticians. The portion of Ketran society that involved the Ellimist was based around a game, akin somewhat to god sims of human video games. In this game, the player would choose a species and make small changes to the planet and to genetic structure, etc. of the species, then see what the outcome was. Two opponents could each make respective changes and see which species survived and which did not, and why.

It was this game (broadcast throughout space, much in the same way that humans broadcast messages about their society via radio waves) that caused the Capasins to come and wipe them out. The Capasins believed that the Ketrans played with the lives of real species, they didn't realise it was a game (they couldn't grasp the concept of games.)

The last of the Ketrans escaped with an experimental spacecraft, and spent the next several decades searching the galaxy for a planet to call their new home. The Ketrans eventually came to a moon covered almost entirely with water, which they believed could have been favourable save for some vital characteristics that needed to be discerned. As they came close to the surface of the water in an effort to probe the moon, their craft was seized by the tentacle of a creature whose tentacled body covered the entire surface of the moon. It pulled the ship into the water, and there were no survivors save for Toomin.

Toomin would go on to become the Ellimist.

Due to their lives of flight, Ketrans are instinctively claustrophobic, to the point where they are absolutely terrified of closed space, even when windows and such allow the illusion of open air. This is a fear that they must conquer after they become a nomadic, space-faring race.

Ketran terminology[]

  • The Crate: The name the Ketrans gave the Capasin ship they captured.
  • Dam: The Ketran word for "mother".
  • Dance By: An event which occurs whenever two crystals on Ket float near each other. Ketrans from each crystal fly out and meet Ketrans from the other crystal.
  • EmCee: A Ketran space exploration ship.
  • Memm: To "memm" someone is to send them a message via the planetary uninet; comparable to sending someone an e-mail or a private message, though the uninet is accessed through the minds of the Ketrans and not technologically. Essentially a slower form of thought-speak.
  • Deep worms: A general curse-like invocation.
  • Sire: The Ketran word for "father".
  • Face-Face: Ketran slang similar to "hitting on" or "flirting".
  • Mones: The Ketran term for the phenomenon that is described very similarly to pheromones emitted by females to attract a male. Ketran females appear to have an ability to pick and choose which male they want to 'mone' and subsequently drive him into state of delirious euphoria.
  • Juvie: The Ketran word for "child" or "offspring".

See also the List of Ketrans


  • Laga: a peaceful race mentioned only in The Ellimist Chronicles. The Ellimist fails to save their planet from an asteroid sent by Crayak.
  • Lebtin Javelin Fish: a large yellow-coloured aquatic creature, with brightly coloured natural harpoons stored within its body. The colour of these harpoons is probably a means of camouflage on its home planet. (Book 12)
  • Luminar: morphed by Visser Three in The Mutation, the Luminar is vaguely humanoid and capable of generating enough heat that it can burn its victims to ash from a few feet away. Unsurprisingly, it is incredibly vulnerable to water. Water does not seem to hurt it, though it does seem to lose its fire power while in water (temporarily).


Template:Infobox fictional race The Leerans are described as a yellow amphibian species with tentacles for arms that resembles a manta ray or frog. They live in the vast oceans on their homeworld, Leera, which has only one small continent of land (originally, Leerans needed to go on land to mate, but technology now makes that unnecessary). Leerans have advanced psychic powers, which makes them very desirable Yeerk hosts. However, their telepathy also makes it impossible for the Yeerks to invade the leera homeland secretly and silently as they have done on Earth. For this reason the Yeerks intended to create versions of Earth sharks with brains large enough to be infestable to serve as underwater shock troops on Leera, but their plan was foiled by the Animorphs. Due to their psychic powers, Leeran-Controllers are able to see past the Animorphs' forms and discover that they are human.

In addition to possessing remarkable psychic abilities, it also revealed in the series that the Leerans are able to regenerate lost body parts. At one point, a pair of Leeran-Controllers (in a moment where their Yeerks panic and lose some control) ask the Animorphs to bite off the brain lobe at the back of their heads (while the Animorphs were in shark morph) to free them from the Yeerks that currently controlled them. At first the Animorphs did not want to do this as they believed that it would kill the host Leerans, however the Leerans reassured them that it is safe and that they would not die.

The planet Leera is home to a vast and amazing variety of aquatic life. Cassie remarked that her mother's marine biologist friend would give her arm to go there. However, there doesn't appear to be any species as powerful as an Earthling hammerhead shark, as evidenced by the failure of Yeerk chemical weapons to even faze the Animorphs in shark form.

Leeran speech appears to be composed entirely of monosyllabic words, each consisting of two letters. However, as they speak, the listener can hear (or feel) the meaning that is being conveyed, as is usual with thought-speak; however, Leeran thought-speak goes even deeper than that, and Leerans are also able to sense emotions, as well as thoughts that other beings do not "say." The actual English translation of this semi-telepathic speech is notated in the books using underlined, italicized text.

Leerans first feature in The Escape, in which a Leeran-Controller attempts to reveal Marco's identity as a human (not an Andalite-bandit, as the Yeerks believed), using its psychic ability, but is not believed when it informs Visser One and is knocked out before it can elaborate on its meaning (Marco was in Gorilla morph, and Viser One thought he meant the Gorilla was a human). The Animorphs later travel to Leera in The Decision, where they help to end the war there in favor of the Andalites and Leerans. A few Leeran children would also be seen as part of the Evolutionist Front in book #41, The Familiar.

Leeran terminology[]

  • Bright Hole: Leera's volcanic past created large, underground bubbles in the rock that contain phosphorescent minerals and bio-organisms.
  • Cha-Ma-Mib: The only known god of the Leerans. (They are one of only two alien species shown in the series to have a religion, the other one being the Hork-Bajir). Mentioned in The Decision.
  • City of Worms: A large Leeran city. It resembles a giant, multi-colored shell full of holes for entrances. Its name is derived from the fact that hundreds of giant, electric-blue eels constantly swim around the city.
  • Leera: The Leeran homeworld. It is mostly covered with water, aside from a single continent and a few islands.


The Lerdethak appears in Animorphs #11: The Forgotten and The Hork-Bajir Chronicles.[1][2]

The Lerdethak is a large creature from the Hork-Bajir homeworld, described as having a dark inner core, surrounded by a maze of snake like arms/tentacles. Through the arms/tentacles, a wide, drooping, blue-outlined mouth is visible.

Originally created by the Arn, the lerdethak is a genetically engineered creature, which lived in the zone of separation on the Hork-Bajir homeworld. Along with the lerdethak, the Arn created the Galilash, Gorks, and Jubba-Jubba, to deter curious Hork-Bajir from venturing into the lower valleys where the Arn lived. The lerdethak, and the other monsters, are controlled by mind-amplifier implants which are placed under the skin of the controllers scalp. Simple images as well as commands are sent to the monsters using this device.

The Lerdethak was one of the monsters used in the initial battle against the Yeerks on the Hork Bajir homeworld, led by Dak Hamee and Aldrea-Iskillion-Falan.

This is a morph possessed by Visser Three, though how he came to possess it is not revealed in the books, but is easy enough to guess, as the Hork-Bajir world was the first planet that the Yeerks took. It is reasonable to guess that after Visser Three first took his Andalite host body he traveled to the Hork-Bajir world and acquired morphs for all of the creatures that the Arn had created. Both the Lerdethak and the Antarean Bogg, that Visser Three used to kill Elfangor[3] were creatures that the Arn used to keep Hork-Bajir from going down into "Father Deep"


  • Mardrut: a whale-sized creature, dark red in color with tiny thrashing 'fish tails' all along its back, that lives on one of the moons orbiting the Andalite home world. It moves by shooting water out of three huge water sacs. Visser Three has this creature as a morph, used in The Message.
  • Mak: Temrash 114 claimed that the Yeerks had conquered this species.
  • Mamathisk: a species mentioned in The Ellimist Chronicles.
  • Mashtimee: a species mentioned in The Ellimist Chronicles. Also mentioned in Animorphs 26 The Attack as a species wiped out by the Howlers.
  • The Mercora are a fictional race of aliens in the Animorphs books by K.A. Applegate first seen in Megamorphs #2: In the Time of Dinosaurs. They resemble giant crabs with very asymmetrical bodies. On one side of the body is a large pincer and on the other are two human-like arms. They also had seven legs (three on one side, four on the other) and multiple spider-like eyes. They cut off their legs for an expression of grief, for they can regenerate their legs. The Mercora lived on Earth 65 million years ago, during the Cretaceous period after their own world had been destroyed by a black hole. They were at war with a species known as the Nesk and with the help of the Animorphs forced them to leave the Earth. However the Nesk diverted the path of a comet so that it would hit the Earth's surface, thus wiping out both the Mercora and the dinosaurs. The Mercora had planned to use a Nesk weapon captured by the Animorphs to prevent this but the Animorphs betrayed them, so that their own timeline could continue uninterrupted. They are now believed to be an extinct race, as none of their fossils were ever found. Marco observed that Broccoli originated from the Mercora home world. He was relieved, though, to find out that carrots were native to Earth.
  • Mortrons: Composed of two separate entities (a yellow and black bottom half with wheels, and a red elongated head with razor-sharp teeth and concealed wings), the Mortrons were a pet species of Esplin 9466. Mortrons are regenerative, meaning if one of them is cut in half, it will sprout into two full Mortrons. Elfangor-Sirinial-Shamtul and Loren fight them in The Andalite Chronicles.
  • Multitudinal: a species mentioned in The Ellimist Chronicles.



The Nartec are a fictional terrestrial species appearing in the Animorphs series, that first appeared in Animorphs 36: The Mutation, narrated by Jake. They were possibly inspired by the legend of Atlantis. They are humanoids that live in a giant cave under the ocean off the coast of the Animorphs' home town. According to Queen Soco, the ruler of the Nartec, the amphibian race once lived on 'the Surface', on an island in the 'Great Ocean.' Over decades, the sea began to swallow up the island. Over generations, the islanders built a towering wall around the island, which grew and grew. Eventually, they were completely submerged, but enclosed by the wall, whose perimeter bent over, touching each other to create a dome. However, according to Ax, this story is highly improbable. What is certain, however, is that the submerged humans adapted to their new environment. Queen Soco referred to this as a "supreme act of will". But soon it became apparent that the 'narna rocks', a highly radioactive material that serves as the Nartec's source of light, was the cause of the rapid mutation of the Nartec to their present form, in the space of a few centuries.

Despite being apparently hominids, the Nartec have huge orange eyes that consume much of their faces. Their skin is blue and slippery, and their hands and feet are webbed which improves hydrodynamic performance. Finally, the Nartec possess a dual respiratory system. While retaining their human lungs, which they use on land, they have gills on their necks in order to filter oxygen from the water. Jake and Cassie both draw disturbing parallels to the amphibian Hork-Bajir Visser Three's medical staff experimented on. The Nartec move fluidly in the water, but are weak and slow on land, with a few exceptions.

The Nartec culture appears deplorably degenerate to the visiting Animorphs. It seems backward and extremely inhumane to them. The Nartec have stolen human seagoing vessels which have sunk over the millennia. The Nartec 'Searchers' are deployed to retrieve wreckage, as well as any surviving humans, whom the amphibians refer to as 'Surface-Dwellers'. Ship parts, flotsam and jetsam are used to build furniture, houses, and other items. Sunken ships, some as large as aircraft carriers, that have remained intact are placed in giant galleries on the outskirts of the only Nartec city the Animorphs have seen. The Animorphs' views of the Nartec 'wonders' vary on two different extremes: the way the city was constructed from ship parts, and the gallery, is incredible; and yet, the Nartec technology was merely stolen from humans. The Nartec militia is equipped with a myriad of collected human arms, from bows and arrows to sub machine guns.

It appears as though no accolade can be awarded the Nartec for cultural or scientific achievement. The Nartec are a race of scavengers, using stolen human and Yeerk technologies. However, they have developed a technique of extracting human DNA for reproduction.

Nartec society is comparable to feudalism, which appears to have changed little over centuries. The royal class and aristocracy live in the centre of the town. The bourgeoisie live further out, while the traders, artisans and manufacturers live closer to the outskirts. Finally, criminals and the poor eke out an existence outside the town. Cassie makes a remark about the sheer backwardness of Nartec discrimination.

Human prisoners retrieved from sunken vessels have appeared to have been treated well as guests, at first, but are then subjected to horrible torture. Nartec 'doctors' inject a solution of 'ablata' weed, which 'renders subjects peaceful and compliant'. This drug merely sedates the victims; it does not put them into sleep, or mask the pain. After dissecting their victims alive, the Nartec remove all organs and stuff them with an unidentified material, and are then put on displays on the human vessels as 'educational exhibits', which the Animorphs found shocking, disturbing, and disgusting.

The Nartec are a dying race. The radioactive rocks in their underwater world ensured their survival, but also sealed their demise. Most mutations are detrimental. The population and life span of the Nartec have dropped over an unspecified amount of time. Infant mortality has been rising as a result of birth defects. The dropping population has forced the amphibian race to inbreed, causing dangerously low fertility. The doomed Nartec have resorted to desperate measures to survive. The main purpose of dissecting the humans is to extract DNA to be somehow transplanted into Nartec females. It has proven a risky process, as a large number of newborns have not inherited the unique Nartec traits needed for survival. Queen Soco's final solution almost came to fruition by chance. By capturing Visser Three's ocean-venturing vessel, the Sea Blade, the Nartec planned to use a powerful, advanced piece of technology to conquer the 'Cultures of the Sun'. The Animorphs came to the conclusion that the Nartec would fail; however, they still possessed nuclear weapons from Soviet and American submarines, although the Animorphs weren't sure if the Nartec were able to breach the PAL arming codes.

After nearly being killed by the Nartec, the Animorphs manage to escape aboard the Sea-Blade by forming a temporary alliance with Visser Three, thus saving all of their lives and stopping Queen Soco's plan to conquer the world.

The only Animorph to acquire and morph a Nartec was Tobias, who morphed one in book 36 to save the rest of the Animorphs from mutation. It is possible that Visser Three may have also taken a Nartec morph while he passed among them unseen, but that is speculation.


The Nesk were a hivemind race of ant-like creatures that settled on Earth around 65,000,000 B.C. They could come together to form any size creature they'd like when times called for it, like for operating the countless alien machinery they've stolen throughout the galaxy over the years. The Nesk warred with the Mercora, a peaceful race who had also settled on Earth. Right before the asteroid that wiped out the dinosaurs hit the Earth, they believed the dinosaurs belonged to them, as well as Earth, too, and they couldn't stand other sentient creatures living on it-namely, the Mercora. It is unknown what exactly happened to them, but they may have eventually evolved into the simple modern-day ants of today.[4] They were featured in Megamorphs #2 In the Time of Dinosaurs.


  • Ongachic: Some of their race have been taken by the Yeerks, but they fled their homeworld long ago. Now they live all throughout the galaxy as a nomadic tribe, and as a result of their decentralization, only a few are known to be Controllers. While watching a Star Trek movie in book 8 (either First Contact or Insurrection), Ax once commented that a Klingon - presumably Worf - was "clearly an Ongachic female." In The Hork-Bajir Chronicles, Esplin 9466 comments that the Galard language was learned from Ongachic hosts, because the Yeerk language (clicks and ultrasonic squeaks) was impossible to speak with Gedd mouths. Galard became the common intergalactic language. Ongachic wave-particle technology was also combined with Andalite shredder technology to create the Dracon Beam.


The Orff are described as being vaguely humanoid, with three quick legs and a long flexible neck ending in a single large internally lit eye (and it is assumed from their spoken dialogue, a mouth of some sort as well.) The pupils of their eyes float freely about their eyes instead of being fixed in the middle. Their skin is almost completely translucent so that their vital organs can be seen by anyone looking at them. Jake guesses that the visible organs are decoys to draw attention away from the actual vital organs which are translucent. This invisibility allows them to go completely unseen in the dark by dimming the light that emits from their eyes.

In the hypothetical future Jake experiences in The Familiar, the Yeerks have won Earth and have gone on to conquer the Andalites as well as a few other unfortunate races. The Orff are assumed to be a more recently assimilated alien species – although, while the Orff are in league with the Yeerks, it is never explicitly stated that the Orff are actually Controllers (some evidence to support them being conquered by the Yeerks appears in the form of a handful of free children, among them a young Orff). On the street level of Earth's cities they act as a sort of police force, hunting down cripples and rebels. They are described as being physically stronger than a human, but not as much as a Hork-Bajir would be. A team of Orff are sent to spy on Jake when he tries to make contact with the Evolutionist Front, and for some time Jake doesn't know where they are because they can become invisible in the dark by dimming their eyes.



The Pemalites resemble dogs, though they walk on their hind legs.


The Pemalites were originally created by the Ellimist, along with many other species, as his way of spreading life and counteracting the destruction caused by Crayak. The Pemalites were the Ellimist's most fruitful creations, doing more good than even he was able to do, and seem to have followed his philosophy of kindness better than any other.

Extermination and rebirth[]

The Pemalites were destroyed several thousand years before the main events of the series. The race was targeted for extermination by the Howlers, almost surely because their master, Crayak, opposed their service to his enemy the Ellimist. Having no weapons, the species was almost completely wiped out. The Pemalites who survived the initial attacks abandoned their planet and, along with the Chee, went to Earth. However, the Howlers had unleashed a genetic virus along with their attacks, and as a result the few remaining members of the species began to die, and reached Earth barely clinging to life. The Chee managed to save their essence, however, and transferred this into wolves, resulting in the creation of the domesticated dog, which, in the words of Erek King, are "all that remains of the Pemalite soul."

Behavior and technology[]

The Exposed Illustration

The Pemalite ship, hidden in a crevice off the U.S. Pacific coast.

The Pemalites were a completely pacifistic species. After an unknown period after their creation by the Ellimist, they in turn created the Chee, intelligent androids who, following their philosophy, are physically incapable of violence. The word Chee means "friend" in the Pemalite language. Pemalite technology is incredibly advanced---a single Pemalite crystal, used to program their computers, would be capable of taking control of every computer on Earth.

The Pemalites in Animorphs[]

A Pemalite spacecraft---the one used by the Chee to arrive on Earth---remains hidden on the planet, under the ocean. Shaped like a canine Pemalite itself, it contains powerful technology only accessible to those who know the computer's security code---however, since the Pemalites were so naturally trusting, the code is only one digit long ("six"). The Yeerks attempted to reach this ship at least twice---once in The Exposed and again in The Mutation. They were aided in their first attempt by the Drode, who also intended to use the occasion to wipe out the Chee; the Animorphs and Erek the Chee managed to foil their plans and rehide the ship. The second attempt to find it was unsuccessful.

In The Android, Erek the Chee mentions that the Pemalites chose to flee to Earth because they had visited the planet some fifty thousand years before the Howler attack. The Pemalite visit to Earth is never again mentioned in the series, though, given the Pemalites' nature, it is possible that life on Earth was somehow affected by this early interaction.


  • Sharf Den: a species that the Howlers will greet by attempting to kiss them.
  • Sstram: Temrash 114 claimed that the Yeerks had conquered this species.

Skrit Na[]

The Skrit Na capture specimens from the many planets they visit and either perform strange medical procedures on them or put them in a zoo on their homeworld. The Time Matrix was first discovered on a Skrit Na ship.

They have a life cycle similar to caterpillars and butterflies: they start as Skrit, which are similar to giant insects. Almost as big as an Andalite, Skrit have fourteen legs and six sets of antennae. The Skrits seem to be relatively unintelligent, and are used to perform simple tasks on the ships. After some time they weave a cocoon. A Na emerges about a year later, which looks like the famous "Grey" aliens reported by alien abductees, and in fact, it is suggested that the Skrit Na are indeed the Greys, given that their appearance, activities and even their ship design is the same. Elfangor describes the Na emerging from a "dead" Skrit, which may indicate that the Skrit does not transform into a Na, but actually gives birth to it or something similar.

Due to their strange life cycle, Skrit Na are considered poor hosts for the Yeerks, so the race was never conquered; rather, the Yeerks seem to have developed a kind of trading partnership with the Skrit Na, not caring much that the Skrit Na usually steal or abduct their loot. This is seen in The Andalite Chronicles, where the Skrit Na acquired the Time Matrix and were willing to trade it to the Yeerks without knowing what it was. The Skrit Na have a less friendly relationship with other species, due to their illegal habits. Elfangor comments in The Andalite Chronicles that no other species can understand the Skrit Na's unusual actions, and hypothesizes that they do not understand themselves either.

The Skrit Na are mentioned briefly by the character Father in The Ellimist Chronicles, where Father claims to have assimilated some into his being, meaning they were already space-faring by this point in the Animorphs timeline. This is interesting, considered the main events of that book take place more than 65,000,000 years in the past, when dinosaurs roamed the Earth and the Andalites were unadvanced and not completely evolved. This would make the Skrit Na one of the oldest races in the Animorph universe, though it is never explained why their society and technology are not significantly more advanced than that of most other races in the series, but it is probably because of their strange behavior and hoarding habit. This only emphasises the point that Father made of the Skrit Na as a species, that "they are a useless race." The Skrit Na can not be infested.



  • Unemite: They are non-spacefaring. Their appearance varies drastically among members of the species; face and hair colors vary, and the number of arms ranges from three to nine. They have two eyes facing forward, and one backward. They enjoy the music of the adge, an instrument with a mouthpiece and seven strings. In The Ellimist Chronicles, Skrit Na captured a Unemite. They were eventually "merged" into "Father", who used music as a game to play against the Ellimist. The Unemite eventually became part of the Ellimist as he collected Father's minds.
  • Unnamed Creature with Eight Heads and Eight Legs: Visser Three's second morph, seen near the end of the first book. A creature of immense size, it has 8 legs, 8 arms, and 8 heads, each with a mouth that can launch fireballs. Its blood may be burning hot as well. This creature is so fearsome, even Taxxons withdraw from Visser Three when he becomes it. No actual name is given for this creature, but the Visser kindly states he got it from "the 4th moon of the 2nd planet of a dying star." He appears morphs it again in The Resistance.


  • Vanarx: Also known as the Yeerkbane, are large, transparent, and purple with a tubelike head. They eat Yeerks by sucking the controller's head until the Yeerk comes out.
  • Veleek: A large tornado like creature that Visser Three captured from Saturn and reprogrammed to track the energy given off by morphing.
  • Venber: Venbers are a race of hydrogen-based aliens, about human size but much taller. They are silver with streaks of blood-red or midnight-blue on their shoulders, waist, and hammerhead shark-like head. Venbers have 4 arms, the lower two of which hold pole-like appendages. Venber live in very low temperature conditions, and because of their hydrogen-based constitution, when they reach temperatures above freezing, they melt. At one time, they lived on a freezing moon and were among the first alien species that the Andalites came in contact with, but they were wiped out by a race known as The Five who melted their bodies for superconductors, and who in turn were wiped out by the Andalites in retaliation. The Yeerks made a crossbreed of Human and Venber for use as biological robots in a secret facility in the Arctic; using them as hosts would have been impractical because the Yeerks would freeze to death.Because of this, it cannot be decided which parts of the Venber are human.



  • Yamphut: A virus from the Andalite homeworld. It can be fatal in Andalites, causing the tria gland to burst. It is communicable to humans and causes flu-like symptoms in them. In Animorphs: The Sickness, a majority of the Animorphs contracted the illness, causing Cassie to venture to the Yeerk pool on her own.
  • Yeerk
  • Yoort: An early species similar to the Yeerks; revealed to have previously been parisitic. In Animorphs: The Attack, it is made known that they could be a catalyst for the Yeerks finding a way out of their parisitisim. As a result of this, Crayak attempted to extinguish the entire race.
Animorphs Jake | Rachel | Tobias | Cassie | Marco | Ax | David
Auxiliary Animorphs James | Collette | Timmy | Kelly | Craig | Erica | Julio | Liam | Tricia | Jessie | Judy | Ray



  1. Applegate, Katherine (1998). The Hork-Bajir Chronicles. Scholastic Publishing. ISBN 0-439-99652-X.
  2. Applegate, Katherine (1997). Animorphs Book 11 The Forgottem. Scholastic Publishing. ISBN 0-590-99732-7.
  3. Applegate, Katherine (1996). Animorphs Book 1 The Invasion. Scholastic Publishing. ISBN 0-590-62977-8.
  4. According to K.A. Retrieved on 1999-05. "What happened to the Nesk? Been to a picnic lately?" - K.A.