List of ben10 aliens
Ben 10 forms
Original ten At the start of the series, Ben only has access to ten aliens. More are gained in the following seasons.
Diamondhead (voiced by Jim Ward in the TV series and by Daran Norris in the live-action movie) is a Petrosapien ("Petro-" referring to rocks, "sapien" referring to an intelligent being; Petrosapien would mean "intelligent rock") from the crystal planet Petropia (a combination of the Greek "Petro-" and "topos", forming a word similar to "rock place"). The planet was destroyed by Vilgax with assistance from Tetrax, who unknowingly helped him create the weapon that destroyed his home. Ben first transforms into Diamondhead in "And Then There Were 10" when he needed to destroy Vilgax's giant robot. In the planning stages, Diamondhead was set up to be one of the aliens Ben would have discovered later on, while Cannonbolt would have been one of the original ten.
Diamondhead's body is composed of an extremely durable organic crystal, making him nearly invulnerable. Diamondhead can control his crystal physiology at will, allowing him to create crude crystal weapons from any part his body on demand or fire crystal shards from his hands. This same ability also allows him to regenerate to an extent, such as regrowing lost limbs. In addition to growing crystal from himself, Diamondhead can grow crystal over other objects. Lasers and other similar weapons are useless against Diamondhead, as his crystal body acts as a prism, refracting the beams. The one drawback to Diamondhead's crystal form is the crystal itself, which can shatter if exposed to sufficiently strong sonic vibrations. While Petrosapiens can regenerate limbs, there is a limit to how much damage they can recover from.
Ben's preferred offensive form is Fourarms (voiced by Richard McGonagle), a Tetramand (tetra meaning "four" in Greek, mand being "arms" in Latin) from the desert planet Khoros. Khoros epitomizes a dystopia, resulting in the strength-oriented Tetramands. Fourarms is the most used alien in the original series, since it is the form that most suits 10-year-old Ben's fighting style: blindly rushing at the enemy with little forethought. Ben first transformed into Fourarms in "Washington B.C." when he needed to fight the giant mammoth that Dr. Animo had reanimated.
Fourarms is a ten-foot tall, four-armed, four-eyed powerhouse with armored skin and extremely dense musculature, making him unmatched in pure physical strength. His strength is such that he can create shockwaves simply by pounding the ground or clapping all four of his hands together, dubbed the "Big Smack", and his leg strength allows him to cross entire city blocks in a single jump. However, all the extra mass of his muscles and heavy skin makes Fourarms relatively slow, and his size likewise makes using things designed for smaller species difficult, especially when enlarging them is a bad idea. When under the effects of an illness, Fourarms' strength and stamina are somewhat lessened and he develops pungent hives in his armpits.
Ghostfreak (voiced by Steven Blum) is an Ectonurite (ecto playing on ectoplasm) from the perpetually dark planet Anur Phaetos (phaetos playing on phantom). Ectonurites are part of a hive mind, which is contained within the vast genetic memory of every Ectonurite. Ben first transformed into Ghostfreak in "Permanent Retirement" when he wanted to get away from his Aunt Vera for a while. Ben's version of Ghostfreak outwardly resembles a one-eyed ghost, the result of a second skin, while Ghostfreak's true form is that of a wraith-like genie with blue claws, decaying skin, and an exposed, upside-down skull with a single eye for a head.
Under Ben's control, Ghostfreak is composed of a variable-density protoplasm which allows him to become invisible and/or intangible at will. Ghostfreak can levitate freely, and he doesn't require oxygen, allowing him to survive in a vacuum. For the short time Ben has access to the form, it has no real weaknesses to speak of, aside from Ben's limited access to its true powers. The second skin protects him from Ghostfreak's otherwise fatal aversion to sunlight, and also allows Ben to frighten his opponents by pulling back the skin to reveal his true form beneath.
In his true form, revealed once Ghostfreak's personality becomes dominant, Ghostfreak demonstrates a number of powers Ben himself cannot use. In addition to the standard invisibility and intangibility, Ghostfreak can render others intangible through physical contact. His intangibility also enables him to possess humans, controlling them from within. Ghostfreak also has psychic abilities such as telepathy and telekinesis, but the extent of these abilities remains unclear. His true form also has a flock of tentacles protruding from his chest, which can be used as extra appendages. In total darkness, these features become even more pronounced, and he can fire energy blasts from his chest. However, having torn off the protective skin Ben made use of, Ghostfreak is extremely photosensitive, combusting when exposed to direct sunlight over a prolonged period. He is also unable to possess Ben while in alien form, as the Omnitrix repels negative forces aimed at it, but can possess other true aliens. At the end of "Be Afraid of the Dark", Ben regains use of Ghostfreak's form, but as a natural Ectonurite, not the sunlight-shielded version.
Grey Matter (voiced by Richard Steven Horvitz in the TV series and by Carlos Alazraqui in the live-action movie) is a Galvan (the former a play on actual grey matter and Greys, the latter a play on galvanization) from the tiny planet Galvan Prime. Ben first transformed into Grey Matter in "Washington B.C." when he saw that a gold Sumo Slammer card could be found in a box of cereal. Gwen found him looking for the card in the cereal boxes at the supermarket. Although Ben rarely intentionally selects Grey Matter, he often finds himself in that form as a result of accidental transformations, such as in "A Small Problem".
Grey Matter is a gray-skinned, frog-like, bipedal alien only five inches tall, however his size belies his intellect, which is second to none. He can create almost anything from spare parts and deduce the function of any device at a glance. This ability extends to organic organisms also, determining the position of nerve clusters under the skin of an alien creature he'd never seen before, as seen in "Truth". His size allows him to squeeze into small spaces, and he can climb walls thanks to tiny suction cups on his skin. He also has sharp teeth, and his slimy skin makes him difficult to grab. However, Grey Matter's size makes him unsuited for battle, and hence Ben must outsmart his enemies while using the form. Showing a more light-hearted side of the Omnitrix, Ben, despite being able to understand any device, does not consciously comprehend what he is doing, leading him to remark as such.
Heatblast (voiced by Steven Blum in the TV series and by David Franklin in the live-action movie) is a Pyronite (pyro meaning fire) from the star Pyros. Heatblast is Ben's first transformation, which was activated in "And Then There Were 10" when Ben was tampering with the Omnitrix upon it first attaching to him.
Heatblast is a magma-based lifeform that can control fire at will, either projecting it in a wide range of forms or absorbing it into himself. He can fire streams of flame, create fireballs, manifest tornadoes of flame, utilize said tornadoes to teleport short distances, and radiate heat in all directions for a localized explosion. He can also achieve flight by firing at the ground to propel himself like a rocket. Apart from this, Heatblast is also a highly durable alien, able to endure being thrown through buildings without being slowed.While under the influence of an illness, Heatblast's powers are reversed, giving him cryokinetic powers instead of the normal pyrokinesis. Heatblast's dependency on heat is also his weakness, as his powers can be negated by sufficient amounts of water or similar fire-extinguishing materials. His natural body heat also prevents him from handling things without burning them, people included.
The aquatic alien Ripjaws (voiced by Fred Tatasciore) is a Piscciss Volann (from piscēs, the Latin word for fish) of the water planet Piscciss. Ben first transformed into Ripjaws in "The Krakken" in order to take the Krakken's eggs back from Jonah Melville. Because of the extremely specific conditions required to maintain Ripjaws, he is the least used Omnitrix alien, and is not seen for the entirety of the third season.
Ripjaws shares a number of traits of Earth aquatic lifeforms—namely alligators, eels, anglerfish, and sharks—combined into a single being. Naturally, his main ability is being able to breathe underwater. Ripjaws can also withstand a remarkable amount of pressure, and his luminescent dangler allows him to see in the darkest of depths (or otherwise dark areas). He can swim at great speeds, and his sharp teeth and claws can pierce through almost anything. His lower jaw can unhinge to allow him to bite much larger objects. Though his tail hides a pair of legs for travel on land, Ripjaws is limited by his need to remain hydrated, dehydrating rapidly if left out of the water for even a few minutes.
Another of Ben's more commonly used forms, Stinkfly (voiced by Dee Bradley Baker) is a Lepidopterran from the swamp planet Lepidopterra (a play on lepidoptera, the scientific name for butterflies and moths). Ben first transformed into Stinkfly in "Washington B.C." when he had to save Gwen after she fell from the Washington Monument.
Stinkfly is meant to be a combination of various Earth insects (dragonflies, crickets, and praying mantises specifically). His primary ability is flight facilitated by the four thin wings on his back, which grant Stinkfly high mobility and speed. Stinkfly also possesses disproportionate strength, enough to carry people and objects heavier than himself. In "Don't Drink the Water", the child form of Stinkfly (Stinkyfly) was able to unleash a powerful herbicide gas by farting. Stinkfly's four eye stalks give him a wide range of vision from the sky, including the ability to look directly behind himself. Pollen ducts in his eyes and mouth allow Stinkfly to excrete high-pressure streams of liquids. The type of liquid can range from a flammable toxin to an immobilizing jelly. His razor-sharp tail and pincer-like legs can also be used in melee combat. Stinkfly's primary weakness is water, which can negate his flight if it gets on his wings. In addition, while his body is fairly strong, his wings are not. A more minor inconvenience is Stinkfly's intense body odor (hence the name), which is a result of the oils he secretes to keep his joints moving.
Upgrade (voiced by Tara Strong) is a Galvanic Mechomorph (mecho- meaning machine and -morph meaning shape) of the moon Galvan B, which orbits Galvan Prime. Though originally uninhabited, Galvan B was accidentally brought to life when Galvan scientists introduced self-replicating nanotechnology to the moon, which bonded with the moon's minerals and created sentient life. Ben first transformed into Upgrade in "Permanent Retirement" to stop some criminals who were robbing an ATM. Upgrade is the only alien form in which Ben's voice does not change, aside from the more computerized tone behind it. The reason for this is revealed in the enhanced version of "Game Over"; Galvanic Mechomorphs can't bond with organic things, so Ben's transformation into Upgrade isn't complete.
Upgrade is composed of nanotechnology, allowing him to reshape his body at will. This makes restraining or harming him difficult, as he can "melt" to avoid either and will quickly regenerate from any damage taken. Upgrade can also merge with other technology, earning his name by upgrading it far beyond its original design as long as he is merged with it. The size of the device is inconsequential. While merged with a device, Upgrade controls it as he would his own body. Even without a machine at hand, Upgrade can reconfigure his form around his eye in order to fire a plasma beam from it. Upgrade is also capable of forming simple constructs from plasma, such as spikes. Upgrade's weakness is his specialization: being technology-oriented, Upgrade cannot possess biological creatures, and sentient or more powerful robots are harder for him to control. Upgrade's liquid-metal composition can also work against him, namely where electrical attacks are concerned. Furthermore, any sort of metal corrosive can upset Upgrade's delicate internal workings and wreak havoc on his systems.
Wildmutt (voiced by Dee Bradley Baker) is a Vulpimancer from the garbage planet Vulpin (a play on vulpine, which means fox). Ben first transformed into Wildmutt in "And Then There Were 10" after his second experiment with the Omnitrix. This was Ben's first intentional transformation.
Wildmutt is a vaguely dog-like alien whose physical features are a cross between a lion and a gorilla. Ben 10,000's Wildmutt has much more pronounced feline traits, including stripes and a tail. Wildmutt's powerful arms allows him to run, jump, and climb objects at high speeds, in addition to making him fairly strong. Wildmutt has no eyes, but has gills on his neck which allow him to hear and see many times better than humans, giving him radar-like sight which is depicted as functioning somewhat like a thermograph sensor. According to various profiles on Wildmutt, the porcupine-like quills on his back supplement his radar sight and can also serve as weapons, either protecting Wildmutt while he's rolling or as projectiles which can be fired off at will. This ability is unique to adult Vulpimancers, and since Ben's version is only ten years old, these quills haven't developed. Wildmutt's weakness, though it is rarely an issue, is his lack of sight, which can be impeded through various means, and he is rendered effectively useless if is nostrils are clogged. Wildmutt is also the only Omnitrix alien who cannot speak in any understandable fashion, communicating through snarls and growls, which can be a problem when attempting to relay messages or avoid conflict.
XLR8 (voiced by Jim Ward) is a Kineceleran (a portmanteau of the words 'kinetic' and 'accelerate') from the hyper-accelerated planet Kinet (the first part of kinetic, which is movement energy). Ben first transformed into XLR8 in "And Then There Were 10" when he decided to play around a bit with his newfound power, using the form to get revenge on some bullies that he fought with earlier in the episode.
XLR8 resembles a semi-armored velociraptor, the base creature for the form's design. XLR8 has wheel-shaped feet and wears a helmet with a windshield, which is part of his alien biology, leaving the features of his head unknown. Ben 10,000's XLR8 also has a scanner built into the helmet, the product of nanotechnology Ben 10,000 uses to enhance his aliens. The bandai profile for XLR8 describes the actual species much differently. The profile states that Kinecelerans are vaguely elfin in appearance, with long hair, blue skin, pointed ears, large tails, and oversized feet,. The Bandai profiles also create another contrast: actual Kinecelerans are said to be incapable of running on slippery surfaces. Furthermore, because of their constant motion, Kinecelerans build up large stores of static electricity, which reacts badly with water. XLR8 has never had either of these problems. Also, the Ben 10: Alien Force episode "Plumber's Helpers" directly contradicts the Bandai profile, as the female Kineceleran named Helen perfectly resembles XLR8.
XLR8 can manipulate friction to reach speeds of 500 mph in an instant, and the same power allows him to climb up walls and run on water with relative ease. Using his speed, XLR8 can perform a number of unique feats. He can create tornadoes through centrifugal force, either through running in a small circle or spinning, and can deliver speed-enhanced attacks in rapid succession. Amazing reflexes accompany this speed, allowing XLR8 to quickly dodge attacks with relative ease. His scissor-like claws can also cut through objects. XLR8's weakness is his lack of physical strength, which is about on par with a normal human, although his speed tends to make up for it. Magnets and charged pulses are said to be a problem, apparently disorienting Kinecelerans to the point that they cannot balance properly, but the series has never addressed this weakness.
Starting with the second season, Ben begins unlocking new forms, either through DNA sampling or pure chance.
Benmummy (voiced by Richard Green) is a Thep Khufan (playing with the word Khufu, an Egyptian pharaoh) from the desert planet Anur Khufos. Ben gains this form in "Under Wraps" when another Thep Khufan inadvertently adds its DNA to the Omnitrix, but accidentally transforms into Upgrade instead when trying to use him. Ben first uses the form in "The Return" to fight off the Yenaldooshi. The credits give the name "Benmummy," though Ben never named it on-screen. Ben's version looks slightly different, with his eyes and the gaps between his bandages glowing green instead of purple. Benmummy also has black bracers and greaves, as well as a smaller mask and the Omnitrix symbol on his left shoulder. Benmummy can speak, even though the original seems to be mute.
Benmummy is composed of a bandage-like material that can be reshaped at will, allowing Benmummy to stretch his limbs, split apart to dodge attacks, and instantly regenerate damage, even impalement and dismemberment. He is also deceptively strong, able to throw a creature as heavy as a Omnitrix Petrosapien with little effort. The material that makes up his body, however, is fairly weak on its own, and can be torn with relative ease. Benmummy's body is also fairly light because of it, making him susceptible to strong winds or other pulling forces.
Benvicktor (voiced by Michael Dorn) is a Transylian (a play on the region of Transylvania, the setting for many monster movies) from the planet Anur Transyl. Ben first gains this form while battling with Doctor Vicktor in "Be Afraid of the Dark", during which time Doctor Vicktor accidentally grabs the Omnitrix. Ben uses the form later in the same episode to fight Ghostfreak. The credits give the form's name as Benvicktor, even though Ben himself has yet to name it. Benvicktor looks slightly different than Doctor Vicktor, the source alien. Benvicktor sports longer hair, a smaller left eye (Vicktor's appears to be mechanical), and generates green lightning rather than purple.
Benvicktor's overall appearance is reminiscent of Frankenstein's monster. Benvictor's main power is the ability to manipulate electricity, which is generated by the structures on his back. With this power, he can channel electricity through metal surfaces or fire it as powerful bolts from his fists. Benvictor's body is made of an organic metal which conducts this electricity, as well as making him quite strong and durable. The metal can also be magnetized to allow him to stand firmly on metal surfaces.
Benwolf (voiced by Tara Strong) is a Loboan (as in Lobo, Spanish for wolf) from the Anur Transyl moon, Luna Lobo (literally translating from Spanish as "Wolf Moon"). Ben obtains this form after an alien of the same species scratched the Omnitrix, causing its DNA to be added into Ben's selection of aliens. Because this is the first alien added in such a manner, he transforms over the course of several hours instead of instantly as he normally does.
Benwolf more or less resembles a werewolf, with the exception of a quadri-hinged mandibled mouth. In keeping with this, Benwolf has enhanced strength, speed, agility, and senses. By opening his mouth, Benwolf can emit a high-pitched howl capable of shattering rock. The only weakness of the form is that it appears to be colorblind.
Cannonbolt (voiced by Fred Tatasciore) is an Arburian Pelarota (based on pelota, Spanish for "ball" and rota, a play on "rotation") from the planet Arburia. The information from the Bandai Alien Collection toy for Cannonbolt refers to his species as a Vulpinic Tortugan (tortuga is Spanish for "turtle") from the planet Vulpin, which Wildmutt also originates from. The Pelarotan home planet was destroyed by the Great One shortly before Ben discovers the form in "The Big Tick". Cannonbolt is the first new alien to appear on the Omnitrix, and eventually replaces Ghostfreak in the opening theme. Cannonbolt was originally meant to be one of the original ten aliens, but was replaced by Diamondhead in production.
Cannonbolt is a hulking, broad-shouldered alien covered in natural armor plating. This armor can resist almost any attack, ranging from acids to lasers to extreme heat. By curling up into a ball, much like an armadillo or pillbug, Cannonbolt can encase himself in his armor, becoming an invulnerable ball. He can then spin himself like a wheel, rolling into enemies at high speeds to attack. The drawback is that Cannonbolt has trouble slowing down once he gets going, which can make hitting more maneuverable targets difficult. In addition, Cannonbolt's speed and maneuverability is limited outside of his ball form, owing to his bulk and high center of gravity.
Ditto (voiced by Rob Paulsen) is a Splixson (based on the word "split") from the Earth-like planet Hathor (the first syllable of this name being similar to the word "half"). Ditto first appears in "Divided We Stand". In his third appearance, Ditto is one of Ken Tennyson's starter aliens.
Ditto is a small, humanoid alien with the ability to clone himself without limit. Every clone operates independently, regardless of whether or not Ben wants them to, and each clone is indistinguishable from the others. Though the clones are autonomous, they share each other's pain, and the death of one clone will cause the death of the rest (as seen with Dr. Animo's Ditto-enhanced Stinkfly mutants) which negates the usefulness of making large numbers of clones. The child-size Ditto is also no stronger nor faster than his size and build suggests.
When the Omnitrix times out, the Ditto clones are forcibly recombined into one before the transformation reverts. If one or more clones are isolated from each other when the Omnitrix times out, the timer will reset periodically until they are reunited. This only seems to apply when a clone is physically unable to reunite with the others; in open air, the clones will float to each other over great distances in order to facilitate the transformation. It is implied that the reset "glitch" forces the Omnitrix into a state where the next transformation is timed out much faster than usual, due to the strain of being active through multiple timeouts.
In the film Ben 10: Race Against Time, the alien Eon (played by Christien Anholt), a Chronian from Chronia, uses the Omnitrix to turn Ben into a younger version of himself, due to the fact that the Hands of Armageddon needed the energy of a young Chronian to activate. He also deactivated the failsafe so his DNA would completely overtake Ben's personality, essentially changing Ben into a clone of himself. As Eon, Ben activates the Hands of Armageddon, but returns to normal after Gwen manages to reach Ben inside Eon. Like the original Eon, the Omnitrix clone has vast time manipulation powers, though Ben himself exhibits little of them besides energy projection.
Eye Guy (voiced by Dee Bradley Baker) is a part bat, part reptile alien introduced in the first alternate opening of Ben 10: Secret of the Omnitrix, replacing Heatblast during the fight with Doctor Animo. How Eye Guy was obtained is never addressed.
Eye Guy's upper-body is covered in eyes, hence the name. Ironically, he has no eyes on his head, which consists of a mouth and a very large pair of ears. From these eyes, Eye Guy can fire numerous energy beams. The eyes can be merged to create different effects, such as three on his shoulder which can form a freezing beam. By merging every eye into the large eye in his chest, he can fire his strongest energy blast. He can also scale walls. Presumably, his multiple eyes also allow for full 360 degree vision. The form does not appear to have any overt weaknesses.
Upchuck (voiced by Dave Wittenberg) is a Gourmand (from the French word meaning one who enjoys fine food or glutton) from the planet Peptos XI (Peptos being the Greek word for 'cooked' or 'digested' and the XI being the roman numeral for eleven). Upchuck first appears in the episode "The Visitor", in which an alien named Xylene enters a code into the Omnitrix to activate the form.
Upchuck is a small alien with a very large appetite. He has four strong, adhesive tongues that can stretch to great lengths, allowing him to latch onto large objects and reel them in with relative ease. Upchuck's mouth and stomach stretch to facilitate the digestion of such objects. Upchuck possesses several acid-filled stomachs that can dissolve all forms of inorganic matter, ironically meaning they can't digest organic matter such as ordinary food. The items ingested are converted into explosive balls of liquids that can be expelled at will with great accuracy. Upchuck also seems to have impressive stamina for his size, as he is able to take on the impact of a moving car  as well as survive being thrown through a wall. His only impediment seems to be his size.
Way Big (voiced by Fred Tatasciore) is a To'kustar (from the Japanese word tokusatsu, a genre of costumed superhero TV shows like Ultraman, which Way Big resembles), an alien species created as an anomaly during cosmic storms . He is by far the biggest alien in Ben's arsenal. Way Big's size grants him extraordinary strength and invulnerability to most attacks; however, in proportion to his size, Way Big does not seem to be any more durable than normal, as Vilgax is able to cause him pain by digging into Way Big's hand with his sharp claws.
Way Big first appears in Ben 10: Secret of the Omnitrix, when Azmuth activates it on the Omnitrix so Ben can fight off Vilgax's army. His only appearance in the TV series itself was in "Ken 10" when Ben loses his temper and viciously beats Kevin into the ground after the latter pushes him too far by injuring Ken.
wildvine (voiced by Jim Ward) is a Florauna (a combination of flora and fauna) from the planet Flors Verdance (a combination of flora and verdens, Latin for green). Wildvine makes his first appearance in the episode "Camp Fear" as an accidental transformation.
Wildvine is a plant-based alien with five vine-like legs, four-fingered claws, and venus flytrap-shaped flaps covering his head. Wildvine can grow to stretch his limbs great lengths or grow thorns to cause additional damage. He can also merge with other plants, and can burrow underground to conduct surprise attacks or travel quickly. Eight regrowable seeds on his back can be used as various types of explosives, both lethal and non-lethal. When exposed to cold, kept from sunlight, or deprived of a water source, however, Wildvine quickly withers up. Ben has never encountered this problem, likely due to the limited periods in which the form is used.
BFiuebfiUBREIbgribfgIJRBFGkjng == Ben 10,000 forms ==
In the episode "Ben 10,000", set twenty years into a possible future, a thirty-year old version of Ben has access to 10,000 different aliens, of which he demonstrates three not yet accessible by the present Ben. Among them are:
Spitter (voiced by Dee Bradley Baker) is a Spheroid from the rainy planet Scalpasc. A large, blowfish-like alien, Spitter has the power to spit slime at high pressures.
Buzzshock (voiced by Tara Strong) is a green Megawhatt (the electric aliens from "Tourist Trap") from the Nosedeen Quasar.
Arcticguana (voiced by Tom Kane) is a Polar Manzardill, one of many types of Manzardill, from the polar ice caps of X'Nelli. He is a blue iguana-like alien that can breathe freezing vapor. 
A number of alien forms were mentioned in the episode "Ken 10", although none have made an onscreen appearance. Snakepit, Sandbox, and Shellhead were among Ken's starter aliens. Of the three, only Shellhead is described, being a turtle-like alien whose only power is to hide within its shell for defense. Another of Ken's initial aliens was Toepick, until he was replaced by Grey Matter (Ken described him as too gross even for him.). Ken also mentions one called Atomix, expressing disappointment that it was not among his choices. oaejfogiWEHigfuwVFIDHVIUhwdfiuhbvjifkdRNGi
Ben 10: Alien Force forms
In the sequel series, Ben 10: Alien Force an older Ben gains ten new alien forms from a recalibrated Omnitrix. The aliens were designed by mixing and matching the powers of the aliens from the original series. Every alien introduced thus far is voiced by Dee Bradley Baker.
Alien X is an alien set to be introduced in "X = Ben + 2". He is Ben's most powerful alien, possessing vast reality warping powers. Alien X has a dark body covered with white stars, white hands and feet, green eyes, and three horns protruding from his head.
Big Chill Big Chill is a moth-like alien whose wings and antennae can "fold" up, giving him the appearance of a phantom; his appearance is reminiscent of the cryptid known as Mothman. He can become intangible and invisible, and can breathe freezing vapor. He can also freeze the objects he phases through at his discretion. He first appears in "Kevin's Big Score" to chase down Kevin after he stole the Rustbucket.
Brainstorm is a genius crustacean alien with the ability to control electrical energy and project force fields around himself and others through thought. He can also fire bolts of electricity. In this form, Ben speaks with much greater diction and with a British accent. He first appears in "Pier Pressure" to battle Ship. Brainstorm is Ben's first accidental transformation in the new series, and the first alien that Ben thinks up a name for (Ben simply shouts out the names of the other aliens upon using them).
Chromastone is a Crystalsapien from the planet Morotesi (which is the Turkish word for ultraviolet). Chromastone is a living crystal, able to absorb energy (like a conductor) and rechannel it into multi-colored laser blasts or simply allow it to pass harmlessly through his body. He also has superhuman strength and is nearly invulnerable to harm. He first appears in "All That Glitters" to stop a group of zombified schoolgirls.
Echo Echo is a Sonorosian from the planet Sonorosia (both a play on sonar). He is a small white alien whose body is a living amplifier. He can scream at ultrasonic frequencies capable of overloading machinery and stopping projectiles in mid-flight. He also has the ability to duplicate himself, not unlike Ditto, but different in that the clones aren't linked in any way, allowing entire groups to be knocked out without hampering the rest. By combining these two aspects, Ben can create the "Wall of Sound", where he and his clones can redirect projectiles back to their source by bouncing them off of strategically placed clones. He first appears in "Ben 10 Returns" when Ben fights a robotic dragon controlled by the Forever Knights. He has a mechanical voice.
Goop is a shape-shifting, self-regenerating green blob that weighs 200 pounds. Goop's slime is controlled by a UFO-like machine over his head, which is also where Ben's voice comes from. The UFO can cause the slime to take any shape, regenerate wounds, and even hover off the ground. However, if the UFO and the slime are separated by even a short distance, the slime will go inert until the UFO recollects it. Goop first appears in "The Gauntlet" when Ben battles an alien robot.
Humongousaur is a Vaxasaurian, a humanoid dinosaur alien from the planet Terradino. Standing at about twelve feet tall, Humongousaur has great strength and vast resistance to injury. He also has the power to increase his own body size and mass, growing up to sixty feet in height. His strength increases as he grows, and his dinosaur features become more pronounced. His first appearance is in "Ben 10 Returns" when Ben fights a swarm of DNAliens.
Jetray is a Aerophibian (a play on 'aero' for air and amphibian) from the planet Aeropela. Jetray is a manta ray-like alien capable of flying and swimming faster than the speed of sound. He can fire neuroshock blasts from his eyes and tail, and the stingers on his head carry a powerful poison. Jetray first appears in "Everybody Talks About the Weather" when Ben needed to chase after Alan Albright.
Spidermonkey is a Arachnichimp (a play on arachnid and chimpanzee) from the planet Aranhascimmia. As his name suggests, he is a six-limbed monkey-like alien. He has superhuman agility and, like a spider, can spin webs from his tail and stick to walls. When Ben transforms into Spidermonkey, he talks in an excited, childish tone and displays mischievous characteristics with occasional monkey-like screeching. He is first seen in "What Are Little Girls Made Of?" to fight his grandmother Verdona Tennyson.
Swampfire is a Methanosian from the planet Methanos (referring to methane). Swampfire is a plant-like alien with a flame-patterned head. He is a combination of the Florauna and Pyronite forms from the original series. He has superhuman strength, vast regenerative powers, the ability to control plantlife through a type of gas, and the ability to shoot fire from his palms thanks to methane naturally produced within his own body. His regenerative ability also allows him to alter his own body, such as tunneling underground in vine form or growing his feet to root himself into the ground. Swampfire is Ben's first transformation when the Omnitrix is recalibrated in "Ben 10 Returns".