List of antagonists in Ben 10

Below is a list of the antagonists in the Ben 10 franchise ranging from Ben 10, Ben 10: Alien Force, and Ben 10: Ultimate Alien.

Vilgax

 * Steven Blum - Ben 10
 * James Remar - Ben 10: Alien Force
 * John DiMaggio - Ben 10 Alien Force: Vilgax Attacks

Vilgax is a Chimera Sui Generis (named after the mythological monster Chimera), as well as an archenemy of Ben. He is vicious, arrogant, and dangerously relentless as he will stop at nothing to obtain the Omnitrix and use it to build an army capable of conquering every planet in the galaxy. He is one of the most feared aliens in the galaxy, having conquered 10 worlds, destroyed five others and created a black hole. In fact, he is so feared, that almost no biological life-form is willing to work for him, forcing him to use robotic Bioids and robot drones for his entire crew, though he is able to find mercenaries willing to work for him for the right price. He is also a self-proclaimed master of the Omnitrix, as he claimed that unlocking the Omnitrix's master control function was "child's play" for him, though how he gained this knowledge is unknown.

In the beginning of the original series, Vilgax had no real powers, though after an accident while trying to get the Omnitrix he was cybernetically enhanced, giving him colossal size, strength and durability that made him a match for every alien Ben could access at that time. He also had the ability to temporarily increase his own muscle mass and strength.

Vilgax returns in "Ben 10: Alien Force", where he gained various new abilities and equipment by draining powers from the champions of ten worlds he conquered. His new abilities include even greater strength and invulnerability, laser vision, wind breath, flight at light-speed, super-hearing, a large sword he can cover with flame or Taedenite, a red laser projector, and a gauntlet he can use to generate force fields and electric shocks.

In Vengeance of Vilgax, Vilgax had defeated Ultimos and claimed his powers. He then arrived on Earth to challenge Ben Tennyson only to end up fighting Grandpa Max and the Helpers. Upon defeating them, Vilgax has Grandpa Max deliver the message to Ben. When Ben fights Vilgax, he ends up shattered as Chromastone but reforms into Diamondhead and defeats Vilgax. Due to his defeat, by intergalactic law, Vilgax had to leave Earth and never return. This did not stop him from returning to Earth a few more times.

In the series finale The Final Battle, he teams up with Albedo in order to obtain the Omnitrix. When Albedo gets Ben to surrender the Omnitrix, Vilgax goes back on his deal and claims the Omnitrix to power the robots present. Albedo tries to fight him and ended up his prisoner. When Ben, Gwen, Kevin, and Grandpa Max ended up, infiltrating his ship. Ben managed to have the Omnitrix set itself to self-destruct which Vilgax thought it was a bluff. When it exploded, Vilgax's robots were useless to him and Kevin was finally reverted back to his human state. Doing the same trick to Albedo, Ben manages to obtain the Ultimatrix and fight Vilgax becoming Swampfire and transforming this form into Ultimate Swampfire. When his ship ended up submerged in the ocean, he is shown to transform into a giant squid-like creature (which he refers to as his true form) when exposed to saltwater. He then attempted to swallow Ben, but as Jetray, was able to escape the ship when it sinks further into the abyss before exploding. Though Vilgax was not shown escaping before the explosion, Ben stated that Vilgax might've escaped as he has survived worse than that.

In the original series, Vilgax knew the secrets of the Omnitrix but 5 years after the original series, he cannot even use the alien selector.

Vilgax appears as the main antagonist for two games based on the series: "Ben 10: Protector of Earth" and "Ben 10 Alien Force: Vilgax Attacks".

Psyphon

 * Dee Bradley Baker - Ben 10: Alien Force and Ben 10: Ultimate Alien

Psyphon is a Calbreus from the Planet Yrtus IV with one large horn protruding from his head and has a slight skeletal appearance. He serves as Vilgax's lackey and adviser, helping his master with draining the powers from the defeated heroes and to drain all the powers of the heroes of the 10 worlds he had conquered. Nothing much is known about him and his personality, but he appears as devoted to Vilgax, and shows sign of arrogance toward Earth people including Ben.

Psyphon returns in "Ben 10: Ultimate Alien". In Reflected Glory, Psyphon seeks to avenge his master's defeat by destroying Ben's "puppet masters" (JT and Cash), bringing with him three R.E.D.s (Robotic Extermination Devices). In that episode, he displayed the power to fly, create red energy beams and barriers, and had enough physical strength to pummel Ultimate Spidermonkey into submission. He was weakened when JT and Cash used a power decoupler to drain out his energies, and then knocked out by a single tap from Ultimate Spidermonkey.

Psyphon appears as a boss character in "Ben 10 Alien Force: Vilgax Attacks" and Ben 10 Ultimate Alien: Cosmic Destruction". He was shown working with the evil To'kustar (actually Albedo in disguise) in a plot to invade Earth. On the DS Version, Ben encounters him in Tokyo.

Doctor Animo

 * Dwight Schultz - Ben 10, Ben 10: Alien Force, and Ben 10: Ultimate Alien

Dr. Aloysius James Animo was once a promising researcher in veterinary science who had a special way with animals. His career was cut short when it was discovered that he was performing twisted genetic experiments on animals. He had hoped that his research would win him the Verties Award, which is an award in veterinary science. Because of the nature of his research, he lost the award to another doctor named Kelly. This drove him insane, and he dropped off the map for five years until he could perfect his research.

In his first appearance, Dr. Animo created his new invention, the Transmodulator, a device that can turn animals into giant monsters, and later bring back dead creatures such as mammoths and tyrannosaurs. He attempted to use his new monsters to take his revenge against Kelly and take his prize, but he was stopped by Ben. After this, he became the third most recurrent villain in the show (the first two being Vilgax and Kevin 11), usually trying to create armies of mutant monsters, and was even able to use DNA information from the Omnitrix to enhance his creatures twice. He has the ability to telepathically control any kind of animal (including his monsters and even non-sentient aliens), which, according to the enhanced version of Ben 10: The Secret of the Omnitrix, he learned from Clancy, who could control insects in the same way, during his time in the Negative 10.

Dr. Animo returns in "Ben 10: Alien Force". In Voided, he had conquered the Null Void by using his power to take control of the Null Guardians and took on the alias D'Void. He then forced the residents of the Null Void to build a machine which would open a portal to Earth so he could conquer it, but he was stopped by the combined forces of Ben and the resistance founded by Max and the Plumber's helpers. In this episode, Animo used his machine to give himself strength and durability which made him a match even for Humungousaur, something Ben stopped by freezing the machine by jumping into it, turning into Big Chill as he did.

Dr. Animo returns in "Ben 10: Ultimate Alien". In Escape From Aggregor, Dr. Animo returned to his old motif and was using a mind-control headband to force a Yeti to fight Ben Tennyson as part of a diversion for his bomb that would turn anyone within the vicinity of the Himalayas into Yetis. Ben as Brainstorm managed to turn the tables on Dr. Animo as Gwen and Kevin disabled the bomb. After freeing the Yeti, Ben, Gwen, and Kevin handed Dr. Animo over to the Plumbers. He appears again in "It's Not Easy Bbeing Gwen" where he attacks the city with an army of giant frogs.

Dr. Animo appears as a boss character in "Ben 10: Protector of Earth." In "Ben 10 Alien Force: Vilgax Attacks," Dr. Animo's D'Void alias is a boss of the Null Void level.

Sixsix
Sixsix, named after the caliber of the two pistols that he wields, is a bounty hunter and mercenary from the Sotoragg system. Unlike the villains Ben has faced, he only speaks in his own language, though other aliens can still understand him and vice versa. It is said he has quite a reputation, as he wears a disguise when in Incarcecon as a means to avoid be attacked by those trying to prove their prowess by beating him.

Sixsix has purple armor and strange, clamp-like feet; the armor he wears was taken from an assassin droid he gutted. He is equipped with a jetpack, and his armor is covered with pouches that hold various weapons and projectiles, such as twin blasters, laser discs, an energized buzz saw, laser blade and whip, a sonic weapon, throwing pikes, grenades, bolas, rockets, and several tentacle-mounted lasers coming out of his back pack. He also has several very strange small claws and hands that extend from his shoulders that are usually used to throw the small pikes coming out of his jet pack, or bombs when he is using his blasters.

In the video games based on the series, Sixsix only appears in "Ben 10: Protector of Earth".

The Circus Freaks
This trio of are recurring minor villains. They worked together in the guise of being freak showperformers in Zombozo's circus before his disappearance. Whenever Ben runs into them, they end up working for the villain of the week. They appear to all three be mutants - at least in the case of Acid Breath, who claims to have gotten his power from his mother. In Last Laugh, they work for Zombozo. Since Zombozo's supposed demise, they have worked for different employers, such as Zs'Skayr ("Gostfreaked Out"), and Sublimino ("Ben 10 vs. the Negative 10") under the orders of Driscoll.

Acid Breath

 * Dee Bradley Baker - Ben 10

Acid Breath is one of Zombozo's three minions, and without a higher rank to command them, he acts as the trio's leader (with somewhat inconclusive results). He has the ability to project corrosive acid from his mouth in the form of either a vapor or a liquid; he claims that he learned this trick from his mother. This acid can easily dissolve whatever he wants it to, even metal and stone. Despite the potency of his breath, however, he is one of Ben's least dangerous foes. If his mouth is jammed by an object (such as a baseball) or if something causes him to cough and gag (such as when Gwen blew a fire extinguisher's contents into his mouth), Acid Breath will be briefly unable to use his powers and vulnerable to attack.

Frightwig

 * Cree Summer - Ben 10

Frightwig has pale skin, a tight-fitting body suit, and five orange prehensile tentacles for hair. They are also tipped with metal orbs, allowing for greater concussive damage. She's also extremely nimble and skilled in acrobatics. Despite her strength, she is always easily subdued by Ben, normally by being tied up with her own hair.

The Ben 10,000 episode revealed that Frightwig, now middle aged, is the leader of the Nuevo Circus Freaks from 20 years in the future according to the Enhanced Edition of that episode.

Thumbskull

 * Jeff Doucette - Ben 10

Thumbskull has a head shaped like a thumb. Instead of hair Thumbskull had a horn that was broken previous to his on screen appearance. He also has incredible strength (though inferior to that of Fourarms), but limited intelligence, normally serving as the 'brawn' of the group. He is also easily beaten by Ben, normally even worse than the others.

The Circus Freaks will return in Ultimate Alien, but it's unknown when.

Hex

 * Khary Payton - Ben 10 and Ben 10: Alien Force
 * Tara Strong - Ben 10 (as a child in "Don't Drink the Water")

Hex, also known as Hexlord, is a self-proclaimed "Master Magician" from Legerdomain who desires to rule the world with his unmatched magical mystical powers. He possesses five magical mystic charms called the Charms of Bezel that give him the incredible powers and abilities of levitation, Pyrokinesis, reincarnation, electrokinesis, and luck/probability manipulation, in addition to his own spell-casting abilities. It is unknown how he possesses powers even without the charms, but since it's implied in In Charm's Way that Charmcaster, daughter of his brother Spellbinder, was trained in controlling and manipulating mana, it was probably the same for him. He first fights the Tennysons while he tries to steal the final Charm of Bezel. During the fight with Ben, Grandpa Max, and Gwen, he locked in a stone casket until the police arrived. Later, he was busted out by his niece Charmcaster and attacked Las Vegas for an artifact that can recreate the Charms of Bazel. In Don't Drink the Water, Hex was aging and sought out a man named Hector in order to learn the location of the Fountain of Youth. A younger Ben as Heat Blast managed to evaporate the water towards Hex sending him flying. His baby form was founded by Charmcaster.

In Time Heals, Gwen snuck into Hex's mansion to steal a specific spell book in one of her attempts to cure Kevin of his current rock/metal state. Despite the warning of Paradox, Gwen does so but ended up causing a timeline where Hex has taken over the world. Upon evading Charmcaster, Gwen infiltrates Hex's mansion again and runs into Hex who had become aware of the timeline change. While a weakened Ben tries to stop Hex and Charmcaster, Gwen successfully makes off with the spell book and prevents herself from causing this timeline.

In the video game "Ben 10: Protector of Earth", Ghostfreak possesses Hex's body and uses it to fight Ben.

The Forever Knights
The Forever Knights are a secret society/paramilitary first formed during the Middle Ages that is dedicated to collecting alien technology. Any aliens they capture along the way are dissected and studied, and any humans caught with them are immediately deemed worthless and disposed of. Their entire organization dresses as if they were knights or mutants. They use a coat of arms over a pair of crossbones as their symbols. Their leader is called the Forever King, though Alien Force reveal there are several pretending to the throne, causing the organization to be divided in splintered groups. At one point in history they called themselves the CIA and were made of royal bloodlines.

It is revealed in "Ben 10 Alien Force" that the reason for their actions is to destroy an 'Immortal Dragon' that is a threat to all mankind it is later revealed that the 'Dragon' is actually an Alien Stellar Cartographer whose translator was destroyed when he was attacked by the first forever knights. The Forever Knights also arm themselves with a large variety of medieval weapons and alien technology, with swords, lances, "laser lances", laser guns and electro shock rods being their most common ones.

In "Ben 10: Ultimate Alien", the Forever Knights became more paramilitary as their arsenal now ranges to tanks as seen in Duped.

In all three TV series and one video game, different VAs have voiced the Forever Knight soldiers: Dee Bradley Baker, Jeff Bennett, Greg Cipes, Tim Curry, John DiMaggio, Greg Ellis, Robert David Hall, Yuri Lowenthal, Peter MacNicol, Richard McGonagle, Scott Menville, Rob Paulsen, Khary Payton, Kevin Michael Richardson, and Fred Tatasciore.

Enoch

 * Richard Doyle - Ben 10 and Ben 10: Ultimate Alien

Enoch has significant influence in the organization, appearing as their paramilitary leader in their first three appearances. He was eventually revealed to be one of Discroll's lieutenants.

In Perfect Day, he and his men captured Ben and trapping him in a dream machine in a plot to remove the Omnitrix from his wrist. Ben turned the tides against him and trapped him in his own dream machine until the police arrive. When the Forever Ninja arrived and found Enoch like this, Driscoll arrived telling him to leave Enoch as he has failed him for the last time. In the "Enhanced Edition" of the episode, it was stated that took Enoch years to recover from the effects of the dream machine.

Enoch reappeared in "Ben 10 Ultimate Alien: Cosmic Destruction" as a boss. Ben encounters him in the ruins in Italy and has been enhanced by a strange artifact. When Ben defeats Enoch, he ends up turning to stone.

Forever King Driscoll

 * Richard Doyle - Ben 10

The first Forever King met by Ben was Driscoll ,a former Plumber who was thrown out in disgrace for stealing alien technology for his own benefit. He later joined the Forever Knights and worked his way up the ranks, eventually becoming a powerful leader. He wears a large armored suit that grants him enhanced strength, energy blasts, and protects him from harm. Driscoll is the closest thing to a main antagonist in the fourth season of the original series.

Forever King Patrick

 * Michael York - Ben 10: Alien Force

Patrick is the Forever King seen in Alien Force. He's dedicated to slay the Dragon, and later to protect Earth against a potential attack from the Dragon's home world after hearing from Connor that the Alien Dragon escaped. In Pet Project, Patrick had Dr. Joseph Chadwick work on the ships that would be needed to attack the Alien Dragon's homeworld which also involved the capture of Ship.

Forever King Urian

 * Jim Piddock - Ben 10: Ultimate Alien

Urian is the leader of another splintered terrorist group of the organization introduced in Ben 10: Ultimate Alien. He wears slightly bulkier Forever Knight armor, minus the helmet. His suit also can give off an electric shock out of his gloves. He and the Forever Knights with him plotted to steal the Toltec Battle Armor from the local museum. He was defeated by Lodestar.

Vulkanus

 * John DiMaggio - Ben 10, Ben 10: Alien Force and Ben 10: Ultimate Alien

Vulkanus is a diminutive Detrovite. He wears mechanical armor to compensate for his small size. His armor makes him powerful enough to match Fourarms.

In the first series, Vulkanus was a freelance agent who teamed up with the bounty hunter Sixsix to create a weapon able to destroy a solar system. He was defeated by the combined forces of Ben and the Galactic Enforcers.

Vulkanus returns in "Ben 10: Alien Force". In Kevin's Big Score, he is shown to have a history with Kevin. According to him, he made a deal with Kevin at some point between the two series, but the he double-crossed him when the Plumbers arrived, causing him to be stuck on Earth. He attempted to take revenge on Kevin, but was stopped by Ben and Gwen. However, he was before this able to shortly force Kevin to absorb Taedanite, the rarest gem in the Galaxy, and by this way gain a fortune and Kevin choose to let him have it as a payment for his past actions. Vulkanus then used his new fortune to buy a permission to change Earth climate so it would be more like his home world. His plan was foiled by Ben, Gwen and Kevin once again. Later in Con of Rath, Kevin, Gwen and Ben (stuck in the form of Rath) met him again on a planet, where they tried to get Taedanite from him to repair their ship. After a failed attempt to negotiate, Rath beats him up and took the Taedanite by force.

Vulkanus returns in "Ben 10: Ultimate Alien". In Hit 'Em Where They Live, he teamed up with Zombozo and Charmcaster to attack Ben's loved ones. He is defeated by Ben in the form of Ultimate Big Chill. In "Absolute Power" Pt. 1, Ben as Humongousaur attacked Vulkanus in order to find out where Kevin is.

Vulkanus appears as a boss in the "Ben 10: Alien Force The Video Game". He also appears as a mini-boss in "Ben 10 Ultimate Alien: Cosmic Destruction". Ben encounters him in the catacombs while Gwen and Kevin were fighting the Forever Knights. In the DS version, Ben encounters him at Wyoming.

Pickaxe Aliens

 * Dee Bradley Baker - Ben 10: Alien Force and Ben 10: Ultimate Alien (vocal effects)

The Pickaxe Aliens are Vulkanus's loyal henchmen. Their name comes from the large pickaxes they use to dig for their master or as weapons. Also, they are referred as Pickaxe Aliens in the credits and video games.

Charmcaster

 * Kari Wahlgren - Ben 10, Ben 10: Alien Force and Ben 10: Ultimate Alien

Charmcaster is Hex's teenage niece. Like Hex, she uses magic, but instead of using a staff, she wields a bag from which she can draw all manner of items, such as magical explosives, throwing blades, or even various clay animals to enlarge and animate. Although small, the bag seems to have something of a pocket dimension inside (basically a magic satchel), allowing Charmcaster to store things within it that logically should not fit (at one point, she produces Hex's magic staff, an item that is at least four feet tall). The bag also found its way back to Charmcaster under its own power, as she was able to get it back after it fell in the sea. She is also skilled in various magical spells, although it's clear that because of her inexperience, she is not as powerful as her uncle. Although she (like many other villains) dislikes Ben, Charmcaster especially despises Gwen on account of their shared natural affinity for magic, similar to Ben and Kevin's rivalry.

Charmcaster helped her uncle to get free from jail and took the key of Bezel from Gwen for him. However, she betrayed him at the last minutes in order to get the Charm of Bezel for herself. Gwen was able to use Hex's staff to stop her, the first hint of her magic abilities. Charmcaster once tried to Switch Bodies with Ben, but when Gwen accidentally interferes, causing Charmcaster to accidentally switch with Gwen instead, Gwen was in Charmcaster's body while Charmcaster was in Gwen's body. Charmcaster stayed with Ben and Grandpa Max while Gwen was in a female's Juvie, but Gwen manages to escape using Charmcaster's magic. Charmcaster tried once again to switch places with Ben, but this time, Charmcaster was back in her true body while both Ben and Gwen ended up in each other's body (Ben was in Gwen's body while Gwen was in Ben's body). When Charmcaster tried to switch places with Gwen when she became Cannonbolt, Ben kicked her out of the bubble and both are back in their true bodies. Gwen then angrily punches Charmcaster as revenge for the mishap. When Charmcaster ended up in juvie, two Criminal women named Pinky and Missy give Charmcaster a beating (after Gwen scared Pinky and Missy using two of Charmcaster's clay animals). Charmcaster was part of the Negative 10's plot to defeat Ben. But even then she was more concerned in defeating Gwen rather than Ben. She also had a rivalry with her partner Rojo.

Charmcaster returns in "Ben 10: Alien Force". She wears a drastically different outfit, and, instead of her bag, she now relies mainly on mana manipulation like Gwen, though she is still seen using various spells such as shape shifting, water manipulation, flight, telekinesis, mind control, teleportation, and bringing inanimate objects to life. She is also far more vicious, sadistic, and arrogant than before. In In Charm's Way, she tricks Kevin into attacking Ben by promising to restore him to normal. In Time Heals, she is shown living with her uncle. In the alternate timeline caused by Gwen in her attempt to cure Kevin of his rock/metal state, Charmcaster had killed Gwen and turned Kevin into her rock-based slave.

Charmcaster returns in "Ben 10: Ultimate Alien". In Hit 'Em Where They Live, she teams up with Zombozo and Vulkanus in a plot to kidnap Ben's parents. She was defeated by Kevin while Ben fought Vulkanus and Gwen faced Zombozo. She appears next in Where the Magic Happens where Ben, Gwen, and Kevin are trapped in her home dimension, Legerdomain, and who will have to depend upon her for survival, which explains her origins and true motives: to free her home world, and people from the rule of an evil mystic magical tyrant named Addwaitya who had killed her father Spellbinder when she was very young. In this episode, she reforms due to a growing friendship with Gwen and became later somewhat of a heroine, risking her own life to save Gwen, Ben, and Kevin, while willingly sealing herself in Legerdomain with no way out. Ben promises Gwen that after Aggregor is dealt with, they will find a way to help Charmcaster free her people and her home world Legerdomain from Addwaitya.

Charmcaster appears as a boss in "Ben 10 Alien Force: Vilgax Attacks." Ben encounters her on Terradino.

Zs'Skayr/Ghostfreak

 * Steven Blum - Ben 10
 * Jeff Bennett - Ben 10: Alien Force

Ghostfreak is the secondary antagonist and he was originally one of Ben's aliens whose DNA was taken from Zs'Skayr, the High Ecto-Lord of the Ectonurite home world of Anur Phaetos, who existed in the Omnitrix due to Ectonurites having the ability for their mind to exist in even in the smallest strand of their DNA. Ghostfreak's original appearance was similar to that of a ghost with a black track along his skin but after freeing himself, he tore off the protective second skin to reveal Zs'Skayr's true horrifying form. He has the power to phase through matter and possess humans by going into them and controlling them. He also has telekinesis over beings he possesses and becomes far stronger if he's in complete darkness, which allows him to become even scarier in appearance and fire a powerful energy beam from his chest. However, without the second skin protecting him, sunlight can cause him to combust and die as seen in "Ghostfreaked Out." In "The Return," Zs'Skayr was resurrected by Viktor and begins his plans to plunge the Earth into darkness. He is once again defeated by Ben who once again destroys Zs'Skayr with the light of the sun. However, Zs'Skayr got some of his DNA into Ben's Omnitrix.

Zs'Skayr turns up alive in the "Ben 10: Alien Force". In Ghost Town. Vilgax busts him out of his special cell in order to learn the location of Primus. Later in the episode, it turned out that Zs'Skayr double-cross Vilgax and took over Vilgaxia causing Vilgax to ask Ben for help. Ben managed to trick Zs'Skayr into him where Zs'Skayr took over Ben. With help from Vilgax shining a light on him, Ben manages to deactivate the Omnitrix trapping Zs'skayr.

Zs'Skayr appears as a boss in both "Ben 10: Protector of Earth" and "Ben 10 Alien Force: Vilgax Attacks" (Not for DS version).

Yenaldooshi
Yenaldooshi is a werewolf-like creature named by Navajo Indians under the impression that it was the actual creature of their folklore. In reality, the "Yenaldooshi" is actually a Loboan from Anur Transyl's moon, Luna Lobo, sent by Doctor Viktor to steal communication equipment from the Navajo Indian reservation that Ben, Gwen, and Grandpa Max were visiting in "Benwolf." Ben first fights against the Loboan as Wildvine, only to change back with the Loboan slashing the Omnitrix's faceplate causing the device to download his DNA, gradually change Ben into the form as the item was trapped between modes. In their second battle, the Loboan appears to be killed by a cave-in, but actually survived as it completes its mission. In Be Afraid of the Dark, it was revealed that the machine was part of Viktor's plan to cover the Earth in Corrodium radiation. When the Corrodium projector on the space station was destroyed, the device blew up in the Loboan's face. It is unknown if it survived or not.

The Mummy
The Mummy, a Thep Khufan from the planet Anur Khufos, was sent by Doctor Viktor to find a dangerous element called Corrodium that crashed on Earth millions of years ago. Grandpa Max explains that the crystals are a potent but unstable power source, and the radiation emitted by the crystals causes’ almost instant mutation in humans and other Terrestrial creatures. Todd Maplewood, a boy Ben and Gwen met, said it arrived in purple lightning, which is the same way the Yenaldooshi arrived inBenwolf. Max states there may be a connection between the werewolf and the mummy, which is proven in The Return. During Ben's battle with the creature, its DNA is absorbed by the Omnitrix, giving Ben access to the form. The mummy is frozen solid by Upgrade, who merges with a container holding liquid nitrogen, and buried, along with its Corrodium, under a thick bed of concrete. In The Return, the Mummy is freed by the Loboan, and the Corrodium it collected is used to power Viktor's machine. The Mummy ends up being pulled through an unstable portal created by Viktor, along with Viktor himself. It is unknown what happened to it.

Viktor

 * Michael Dorn - Ben 10
 * Peter Stormare - Ben 10: Ultimate Alien (with King Xarion's mind)

Doctor Viktor is a Transylian from Anur Transyl, an alien resembling Frankenstein's monster and able to generate electricity from his very body to use in his attacks. His name is derived from the name of Victor Frankenstein from the Mary Shelley novel. Despite his size, he possesses excellent reflexes, able to quickly spin around and backhand super-speeding XLR8 when the latter attempted a sneak attack on him.

As Zs'Skayr's second in command, using his powers on a teleportation machine to send his comrades to their positions, Viktor posed as a human to get a job at NASA to obtain the means to hijack a space shuttle while reviving his master to achieve their ultimate plan was to prevent the sun's light from reaching the earth using various satellites. During the resulting battle, Ben accidentally had the Omitrix scan Viktor's DNA before Viktor essentially defeats himself when an attempt to teleport Ben to an unspecified location, ended up with him and the Mummy getting tossed into the portal he created.

Dr. Viktor returns in Ben 10: Ultimate Alien redesigned to look similar to Benviktor with two red eyes and a metal plate on his head, with lightning that is no longer purple but blue. Viktor was among Kevin's victims during the events of Absolute Power. After his energy was taken, Viktor was tossed into the Null Void. Between then and his return in Viktor: The Spoils, Viktor ended up encased in ice and brain dead by the time he somehow ended up in the war-torn country of Zarkovia. However, originally intended as a weapon by his son Prince Gyula in order to dispose him, King Xarion transferred his mind into Viktor using a special contraption and Ben when he was passed out as AmpFibian. With Xarion's mind inside his body, the alien renamed himself King Viktor and nearly decimates the rebels before Ben's group encase him in a molten tank, vowing revenge on them for taking his birth right from him.

Eon

 * Christien Anholt - Ben 10: Race Against Time
 * Sean Donnellan and Yuri Lowenthal - Ben 10: Ultimate Alien

Eon is a Chronian from the planet Chronia (both played with the Greek word "Chronos", that means time). He first appeared in "Race Against Time" within an alternate timeline. He wanted to activate the Hands of Armageddon. He sent his servants to turn Ben into a younger version of himself, because the Hands of Armageddon need the energy of a young Chronian to activate. Ben turned into a clone Eon before Gwen manages to snap him out of it. Ben became Wildmutt and as he sent Eon crashing onto the Hands, the artifact was destroyed, with Eon trapped within cross-time as he proceeds to travel to different timelines to absorb every Ben and turn them into his minions by the time he returns in Ultimate Alien episode "Ben 10,000 returns". During the battle with that dimension's Ben 10,000 (the actual future self of Ben), Eon is sent back into cross-time and used Ben and Ben 10,000's powers to infuse their timeline's Hands of Armageddon with energy the complete his arrival into the current time. Once his minions' identities were revealed, Eon unmasks himself to reveal an identical face to Ben 10,000 and reveals his goal to absorb every Ben to become the sole existing Ben. However, when the Hands of Armageddon are destroyed, along with other cross-time counterparts, Eon is removed from the timeline and his actions reversed.

Highbreed
The Highbreed are xenophobic alien races from the planet Augstaka that serve as the primary antagonists of the first half of "Ben 10: Alien Force". They considered themselves as the highest life-form in the universe, believing that they were the first race to exist, and that all other races are mongrels and vermin. However, their "purity" was their undoing as generations of inbreeding left them near extinction and thus become determined to conquer the universe and cleanse it of all other races before dying out. To that end, they created DNAliens to normally do their menial work (likely due to their preference to avoid as much contact with other life-forms as possible), though they occasionally hire non-Highbreed mercenaries to do work for them. Following the events of War of the Worlds, the Highbreed no longer have this view of other races due to all being infused with random DNA from the Omnitrix, which also saved their species, and the actions of Reinrassic III who had rehabilitated in his exile and is now the "Highbreed Supreme" and Ben's ally.

Different VAs has voiced the Highbreed: Dee Bradley Baker, Paul Eiding, Robert David Hall, Richard McGonagle, and Kevin Michael Richardson.

The Highbreed appear as the main antagonists in "Ben 10 Alien Force: The Game".

DNAliens
The DNAliens are highly durable, asexual hybrid drones who serve the Highbreed, despite their racist and bigoted purposes, and are the main antagonists of Ben 10: Alien Force Season 1. They are created by attaching aHeadcrab-like parasite called a Xenocite to a host, altering the host's genetic structure, mutating them into a DNAlien within hours. While only human based DNAliens appeared in the series, there are other types with traits from the alien victim. The process is reversible through the Omnitrix separating a victim from a Xenocite. Following the events of "War of the Worlds", all DNAliens were restored to their original forms.

Different VAs have voiced the DNAliens: Dee Bradley Baker, Jeff Bennett, Greg Cipes, Diane Delano, Paul Eiding, Will Friedle, Wallace Langham and Richard McGonagle.

Darkstar

 * Will Wheaton - Ben 10: Alien Force and Ben 10: Ultimate Alien

Michael Murphy "Mike" Morningstar is a false protagonist and he is the son of a plumber who first appears in the episode "All That Glitters." His name appears to be an allusion to Lucifer, who was also known as the morning star. He is vampire-like in that he has the power to drain the life force from people and turn them into zombies, but he seems to prefer school girls as they easily fall for his good looks. Mike can use the energy he drains for flight, superhuman strength and durability, and to fire destructive energy blasts. His victims can be identified by circular, star-like marks on their arms that bear resemblance to parasite bites; a result of the mouths on his palms, which facilitate his powers. Mike believes that, since he was born with superpowers, he should only use them to get whatever he wants instead of helping others.

After a failed attempt to absorb Gwen's life force in his first appearance, his face was permanently zombified, forcing him to wear a metal mask, and now calls himself Darkstar, claiming that Morningstar no longer exists. Over the weeks, his hunger and powers grew stronger than ever. While he seems to have lost his ability to fly and can no longer transform people into zombies, he can now manipulate dark energy and can use it to absorb the life force from living beings and shoot powerful blasts. If Darkstar absorbs enough life energy, his face is restored but this process nearly kills who ever he is absorbing the life energy from. In Trade-Off, Darkstar offers to help Kevin return to normal by getting him to help him get the Dominus Librium, transferring Kevin's energy to restore his appearance and boost his powers. However, Kevin destroys the item and reverses the process.

Darkstar returns in "Ben 10: Ultimate Alien". In the two-part episode Absolute Power, he is now sporting a hooded cape. He tried to drain energy from a dog only for Gwen to intervene. Upon restraining him with her mana attacks, Gwen uses a spell that restores Michael Darkstar to normal in exchange that he helps to track down Kevin with a chance to restore him to normal. Darkstar had a fragment of the Dominus Librium with him which was used as part of a device that restored Kevin to normal. Though Michael Darkstar intended to betray the heroes and absorb the extacted energy, gaining a golden appearance, Ben expected it and activated a fail-safe that returned Darkstar back to his normal self before he is knocked out by Kevin.

Darkstar appears as a boss in "Ben 10 Alien Force: Vilgax Attacks". Ben encounters him on Encephalonus IV.

Argit

 * Alexander Polinsky - Ben 10: Alien Force and Ben 10: Ultimate Alien

Argit is a rodent-like alien who was one of Kevin's former associates and a minor criminal. He's a known con-man who seems to always owe someone money, thus he's normally seen trying to make money either for his own gain, or to pay off his debts. He has the ability to fire quills from his back that paralyzes and put others to sleep. Argit also has the ability to "play possum." He and Kevin share a business partnership with one another, though Argit would not hesitate to trick Kevin if it's in his interest. Kevin is well aware of Argit's greedy nature, even commenting that he sold his mother for "top dollar". Despite this, he still teams up with Argit in his schemes. In fact, Argit greedy and coward personality lets him to being highly sadistic and sociopath, visible in "Andreas Fault" where he shamelessly take advantage over Andreas' innocence, tricking him in to destroying Forever Knights castles, and when Andreas apparently dies, Argit shows no sorrow for him, and even displays ignorance over the term "sympathy," since, right after Kevin scolded him for going too far, Argit coldly remarked "I don't understand you, Kevin!"

In Kevin's Big Score, Kevin ended up selling the Rustbucket to Argit. When Kevin arrived with Ben and Gwen about where the Rustbucket is, Argit was unwilling to tell and attacked them only to be defeated by Ben as Echo Echo (who managed to glue the quills on his back). Argit told them that Vulkanus has the Rust Bucket. In Simple, Argit was found on a planet by Kevin selling recolored Red Army weapons to the Blue Army. Kevin ended up helping him on that until he had to take his leave with Ben and Gwen. In Con of Rath, Ben, Gwen, and Kevin encounter Argit on a dining space station where Kevin unknowingly revealed their mission to bring the Tiffin to Jarret. Argit ended up tipping off the Vreedle Brothers about this. Argit was among the patrons there who were defeated by Rath.

Argit returns in "Ben 10: Ultimate Alien". In Andreas' Fault, Argit has his encounter with Andreas. Argit goes to each of the Forever Knights' bases offering them insurance with Andreas leveling the bases. Argit and Andreas managed to claim one of the Forever Knight bases when Ben, Gwen, and Kevin arrived. Things went horribly awry when Sir Dagonet arrived to dispose of Argit. Argit, Ben, Gwen, and Kevin ended up imprisoned while Andreas is scheduled to be executed. Argit managed to escape with Ben, Gwen, and Kevin and free Andreas. After Andreas seemingly perished trying to stop the self-destructing weapon, Argit seemed to have ended up having to feel remorse for the presumed loss of Andreas, but all he actually cared about was that the castle was destroyed. Kevin claimed that Argit had gone too far this time and their alliance is broken up.

In The Enemy of My Enemy, Argit is hired by the Vreedle Brothers' father Pops Vreedle to infiltrate the Plumber's Academy to fix their test scores. Argit is attacked by the mutated and vengeful Kevin. Barely managing to escape, he finds Ben and Gwen, asking that he be taken in for his own protection. Ben and Gwen take him to the Plumber's Academy, which actually fits in with Argit's plans, as he had been assigned by the Vreedle Brother's father to infiltrate the Academy and change their failing grades. Kevin finds Argit and attacks him again. However, Argit tricks him into thinking that he is dead by stopping his pulse. After Kevin leaves, Argit is arrested by the Plumbers for his various crimes which included knocking out two of Magister Coronach's men.

Sevenseven

 * Dee Bradley Baker - Ben 10: Alien Force and Ben 10: Ultimate Alien

Sevenseven is an alien bounty hunter. He is of the same race as Sixsix, but far more dangerous. Much like Sixsix, he does not speak a word of English, even when talking to those who do, but other aliens have been shown to understand him. Unlike Sixsix, who uses weapons hidden in compartments of his armor, Sevenseven's hands can transform into various weapons and tools. It is mentioned that Sevenseven is Sixsix's older brother.

In X = Ben + 2, Sevenseven had captured Princess Attea near Earth causing Emperor Milleous to target Earth for destruction. Attea later paid him to help overthrow her father, but both of them were defeated by Ben.

Sevenseven returns in "Ben 10: Ultimate Alien".

Sevenseven appears in The Big Story. Ben defeats him with Rath. Rath called him "Karate man", because of his swords.

Sevenseven appears as a boss in Ben 10 Ultimate Alien: Cosmic Destruction. Ben encounters him at Wyoming. In the DS version, Ben encounters him in China.

Albedo

 * Yuri Lowenthal - Ben 10: Alien Force (in Ben form)

Albedo is the another antagonist and he is the brilliant, albeit arrogant and rude Galvan that shows sociopathic tendencies, his actual age is unknown. At one point, he was the assistant to Azmuth, whom he asked for an Omnitrix of his own. When Azmuth refused, he built one of inferior quality and synchronized it to work exactly like Ben's; unfortunately, as Ben's DNA is the default, Albedo was transformed into a clone of Ben. As a result, he also developed many of Ben's habits and traits, which he considers utterly repulsive. He tried to get Ben's Omnitrix in his first appearance, believing it would be able to turn him back to his original form. When Ben refused, he tried to kill him, causing them to fight twice. Albedo's human form was damaged during the second fight when their Omnitrixes fused to each other, causing him to have reversed colors (white/silver hair, red and black jacket, white shirt, and black pants). Azmuth then disabled Albedo's false Omnitrix and sent him into the Null Void, still stuck in his human form.

In the series finale The Final Battle, Albedo eventually escapes from the Null Void, teams up with Vilgax, steals the Ultimatrix from Azmuth, and completes it. After being further annoyed with the fact that it did not have a Galvan in the active list to set as the new default form, and that it only had Ben's aliens, he and Vilgax orchestrate Gwen and Kevin's capture so that they can obtain Ben's Omnitrix. However, after Vilgax eventually fight him, Albedo is forced to give Ben the Ultimatrix when Ben threatens to blow him up with the Ultimatrix's self destruct system. It's unknown what happened to him after Vilgax's ship had been destroyed, as he was not seen escaping.

Albedo appears as a boss in "Ben 10 Alien Force: Vilgax Attacks". Ben ends up encountering Albedo on Morotesi.

Albedo appears as the main antagonist in the "Ben 10 Ultimate Alien: Cosmic Destruction" video game. He has harvested the To'kustar DNA and used it to become one in order to attack Earth.

The Hive

 * Vicki Lewis - The Queen - Ben 10: Alien Swarm
 * Herbert Siguenza - Victor Validus - Ben 10: Alien Swarm
 * Brian George - Victor Validus clones - Ben 10: Ultimate Alien
 * Tia Texada - Elena Validus / The Queen - Ben 10: Ultimate Alien

The Hive is the main antagonist in Ben 10: Alien Swarm, biomechnical beings shaped like nano-chips. The Queen produces them from her body and later, after she takes up residence in Victor Validus's body she produces them from there. They have the ability to take over a person's mind. They are a hybrid which is part organic matter and part machine as pointed out by Kevin. However, the queen transferred herself into the body of Elena Validus after leaving a decoy queen that is destroyed by Nanomech.

Months later, by the events of Ben 10: Ultimate Alien episode "Revenge of the Swarm", the Hive resurfaces after completely integrating with Elena, acting on her unconscious desires for Ben to the point of harming anyone who gets in the way. Eventually, as a final act of resistance, Elena goes to the Nanochip-destroyer and sacrifices herself to stop the hive. However at the end of the episode, the nano-chips are shown to start to reform.

Vreedle Brothers

 * Octagon: John DiMaggio - Ben 10: Alien Force and Ben 10: Ultimate Alien
 * Rhomboid: Rob Paulsen - Ben 10: Alien Force and Ben 10: Ultimate Alien

Octagon and Rhomboid Vreedle are an army of clones of two alien brothers, all of which work as "Repo" men. The Octagons are slimy and the most intelligent of the duo (though this is relative), while the Rhomboids are fat and naive.

The Vreedle's are all clones created by their parents who created multiple clones of them using an expired "cloning kit." Rhomboid also said that the "Clones" created with that kit were considered to be "spoiled" meaning the Vreedle Bros are basically defective clones. This causes the Vreedle to have very low intelligence that often serves as a comical resort in the show : they cannot spell their own name right, tend to have a shoot-first-ask-questions-second approach and even once used a nuclear fusion grenade inside a space station, oblivious to the fact it would kill them too. Because of this weak intelligence, the Vreedle are considered as part of Ben's weakest enemies: Kevin even once hinted it was a shame to get defeated by them.

In Vreedle, Vreedle, the Vreedle Brothers are hired by Baz-El to repossess Ship for him. After Judge Domstol found the case in favor of Ben, Baz-L ordered the Vreedle Brothers to drop from their mission. They denied that request causing them to be fended off by Ben and Kevin. In Busy Box, the Vreedle Brothers arrived on Earth to claim the Naljian Destructor. They managed to take the Naljian Destructor and adapted to their way of causing destruction. When the Naljian Destructor starts acting on its own, the Vreedle Brothers returned it to Earth to cause destruction there before attempting to escape. However the Naljian Destructor shoots an energy beam at the fleeing Vreedle Brothers ship which destroys it. In Con of Rath, the Vreedle Brothers are tipped off by Argit about the Tiffin. When asked how they survived the explosion, Rhomboid mentioned that they are actually one of the many clones created by their parents from a "spoiled" cloning kit. The Vreedle Brothers rallied up the patrons to claim the Tiffin. The Vreedle Brothers ended up ejected into space by Ben (in the form of Rath).

The Vreedle Brothers return in "Ben 10: Ultimate Alien". In The Enemy of My Enemy, another pair of Vreedle clones are seen at the Plumber's Academy. They genuinely seem to want to turn over a new leaf (though they said they were forced to attend by their father who would have had them "Whacked, AGAIN"), although their grades are so abysmal that their father Pops Vreedle sends Argit in to improve them via hacking the systems. The Vreedles attempt to help fight Kevin by throwing a nuclear fusion grenade at him, unaware that it will destroy the entire academy and everyone in it. After Kevin leaves, the Vreedles help arrest Argit.

The Vreedle Brothers appears as bosses in "Ben 10 Alien Force: Vilgax Attacks", and "Ben 10 Ultimate Alien: Cosmic Destruction". In the first, Ben encounters their on Vulpin (on Enchephalonius IV, at DS version). In the second, Ben encounters Vreedle Clones at Paris as a mini level (who were killed by Ben) and later encounters their clones in the Amazon as the main boss(es) where they were killed again when the base self destructed. On the DS Version, Ben encounters them at Plumber's Academy in space.

Will Harangue

 * John DiMaggio - Ben 10: Ultimate Alien

Will Harangue is a loud-vocaled television newscaster who hosts "The Harangue Nation" on cable. Firmly convinced that Ben Tennyson is a threat to humanity, Will has launched a smear campaign against him and constantly tries to denounce him as as such (Although there is evidence to suggest he only does so in order to garner ratings).

In Video Games, he worked with Oliver Thompson in an attempt to destroy Ben Tennyson by creating a robot called "The Stalker" that had all of Ben's alien powers scanned into it, like as the robot of the movie "The Incredibles". The only alien that could defeat The Stalker was Nanomech. Ben as Way Big crushed its remains and dropped it on Harangue's car.

In "Hero Time", he is shown in a deal with Captain Nemesis' partner Simons in a plot to make Captain Nemesis popular again. Will even made an interview with Captain Nemesis giving him the credit for stopping Computron. The next day, he held a special with Jennifer Nocturne as his field correspondent. When Ben as Four Arms beats Captain Nemesis in a tug-of-war challenge, Will Harangue commented that "he can't say Ben cheated," but will leave that to the viewer. After Captain Nemesis was arrested, Will Harangue reported on this stating that a good man did bad things in order to stop "the menace that is Ben Tennyson". In "The Big Story," Jimmy Jones goes to Harangue's show to say that Ben has been taken over by the Alien Plant and Harangue twists his words proclaiming that Ben is the vanguard of an alien invasion.

Will Harangue appears in "Ben 10 Ultimate Alien: Cosmic Destruction" where he is featured on the news talking about Ben Tennyson's "attacks" on the other countries using footage leaked to him by Captain Nemesis. He even blames Ben for the To'kustar's attack on Earth.

Aggregor

 * John DiMaggio - Ben 10: Ultimate Alien

Aggregor is an Osmosian (same species that Kevin inherited his powers from) from the distant planet Osmos 5 who serves as the main antagonist in the first season of Ben 10: Ultimate Alien.

Like Kevin, he can absorb any type of matter and energy and use them by the force of his will, with his own natural abilities or with his staff. Like Vilgax, he uses robots as his army rather than living soldiers. In direct contrast to Vilgax and the Highbreed, Aggregor prefers to carry out his plans himself rather than let his henchmen do the work for him. Aggregor can also absorb the powers and abilities of aliens, but he can only use one tenth of that alien's power and ability.

To bypass this weakness, Aggregor kidnapped five aliens from the Andromeda Galaxy so he could permanently drain them all of their powers and abilities with a machine he built back on his home world. After which, he plans upon using their combined powers and abilities to obtain an "ultimate prize": absorbing a newly born Celestialsapien and become all powerful. His plans were delayed when the aliens managed to escape from his ship, and crash landed on Earth. During that time, he managed to kill Magister Gilhil during the inspection of Aggregor's ship. Determined to reach his goal, Aggregor hunted down each of the aliens one by one by using the Ultimatrix as a homing device. He ended up encountering Ben, Gwen, and Kevin when it came to Ra'ad.

Though forced to rely on other means, Aggregor manages to absorb the aliens' powers where they faded away in the process and becomes an unstoppable monster with a Ra'ad-based head and hair, his neck reminiscent of P'andor's armor, Andreas' arms, Galapagus' torso, and Bivalvan's hands and lower body. With his new form, Aggregor proceeds to obtain the broken pieces Map of Infinity that will help him reach the Forge of Creation. Although he beat Ben Tennyson and obtained all four pieces of the Map of Infinity, Aggregor was unable to achieve his prize when Kevin absorbs the Ultimatrix energy and turns Aggregor back to his original form upon defeat.

Aggregor's soldiers
They are red robots from Osmos V that help Aggregor and serve as his foot soldiers. They appear first time in "Escape from Aggregor".

Old George
Old George is an elderly man, apparently mute, with connection to the Lucubra and the Forever Knights and serves as the main antagonist of the season 2 of Ben 10: Ultimate Alien.

Old George first appeared in "The Creature From Beyond". He has a coin with the infinite symbol, the same symbol as the seal that held the Lucubra and the Forever Knights' armor. Also, he somehow knew when the seal was destroyed. At the end of the episode he was seen looking at the damaged seal, then quickly leaving the site.

In "Ben 10,000 Returns", Professor Paradox warns Ben of Old George and the "Creature from Beyond".

In "Prisoner Number 775 is Missing", Old George arrives at Area 51 where he attacks the guards and destroys the base leaving a crater that revealed the compartments that contained the alien prisoners. What his intentions were and where he was after at the moment are unknown. Despite his age, he is really strong, which means that he can be powerful.