Characters / Ben 10: Omnitrix Aliens (Original Series)

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Arctiguana

Arctiguana/Ultimate Arctiguana (OS-27)

^{Click here to see Ultimate Arcticguana as used by Albedo}

Voiced by: Tom Kane (Original Series), Eric Bauza (Omniverse)

Arctiguana's DNA was sampled from a Polar Manzardills, an alien species that is somewhere between a lizard and a fish. They have the ability to breathe frozen vapor which can be used as a weapon, provided they aren't out of breath.

Ben 23's version is named Freezelizard.

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• Ascended Extra: He was only seen as one of Ben 10,000's aliens in future episodes of the Original Series while the alternate version of Ben 10,000 had also used him Ultimate Alien. Present Ben uses him for the first time in Omniverse, but the episode Ben Again also reveals that he had been using Arctiguana since he was 11.
• Backpack Cannon: Ultimate Arctiguana has two ice cannons on his back.
• Breath Weapon: Ice breath to be accurate.
• Evolution Power-Up: Though the full extent of Ultimate Arctiguana's powers is unknown, his evolved state gains two large cannons that are attached to his back, and he can shoot fully formed icebergs instead of just freeze rays.
• Facial Markings: Black stripes across his face.
• An Ice Person: His main power is ice breath. It's powerful enough to freeze an entire lake in seconds, as well as instantly cool down a massive flow of lava.
• Just a Stupid Accent: Omniverse has him speak in a Jamaican accent.
• Overshadowed by Awesome: Big Chill has the same power along with flight, intangibility, and immunity to both heat and cold. Arctiguana seems to be a bit stronger physically, but that's a very small niche compared to the extensive advantages that Big Chill has. As a result, he rarely appears in Omniverse.
• Shout-Out: The cannons on his Ultimate form give him a resemblance to Blastoise.
• Super Not-Drowning Skills: Arctiguana can breathe underwater.

Blitzwolfer (Benwolf)

Blitzwolfer (Benwolf) (OS-31)

Voiced by: Tara Strong (Original Series), Kevin Michael Richardson (Omniverse)

Blitzwolfer's DNA was sampled from a Loboan, a werewolf-like species from the moon Luna Lobo which orbits the planet Anur Transyl. A wooded moon, Luna Lobo's landscape is prowled with a race of cunning wolf-beasts with a thirst for blood. While these feral creatures mostly hunt in packs, it is a lone wolf beast that often proves to be the most savage of all. Loboans have natural strength, speed, agility, and heightened senses that make them the top predator on Luna Lobo. They also have the ability to split their mouth into four parts and perform a sonic howl.

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• Dark Is Not Evil: Despite all the red flags in his debut episode (getting "infected" by an evil werewolf causing Ben to mutate into a werewolf himself), Ben's personality doesn't change at all in this form.
• Flanderization: In Omniverse, Blitzwolfer develops several dog-like qualities, presumably to make him more appealing to Kai and emphasize his pet-like relationship with her. He chases Nyancy Chan and her cats, enjoys being petted, and even wags his tail when being praised by Kai.
• Flower Mouth: His mouth opens up this way when performing his sonic howl.
• Lightning Bruiser: He possesses a decent amount of superhuman strength, plus a quite impressive natural speed.
• Line-of-Sight Name: When Kai refers to the alien as Benwolf in Omniverse, Ben immediately claims to have changed the name, but can't think of a replacement name until he spots Wolf Blitzer on TV.
• Metamorphosis: Due to (according to Man of Action) the Omnitrix being stuck between "transforming" and "sampling DNA" functions when the DNA was sampled, Ben's first transformation into this form was gradual, with his skin turning blue, fur growing on him and the instinct partially taking over him. invoked
• Noble Wolf: When Mr. "It's Hero Time" becomes a wolf, then yes.
• One-Shot Character: He only appeared in one episode of the original series and didn't appear again until Omniverse. Dialogue from his return episode strongly implies that Ben never used him in the interim.
• Our Werewolves Are Different: They're aliens from Luna Lobo, a moon orbiting around Anur Transyl. They obviously don't have a human form and don't infect people by biting (though it was initially believed by the characters they did in Benwolf-see Metamorphosis above). And they have the ability to generate a powerful Sonic Howl.
• Overshadowed by Awesome: While Blitzwolfer does have some decent fighting prowess, he doesn't exactly stand out compared to the other combat-orient aliens Ben has, much less any average werewolf-like beast. And his sonic screech, the one thing that makes him distinct, pales in comparison to Echo Echo's powers which, while Word of God says is weaker than Blitzwolfer's, lacks the versatility of the power when used in tandem with Echo Echo's Me's a Crowd and echolocation abilities.
• Retcon: Originally, it was stated that all Loboan cubs had green eyes like him and that all adult Loboans had red and pale orange eyes. Come Omniverse, Blitzwolfer still has green eyes just like the rest of Ben's transformations, and other adult Loboans have varying eye colors.
• Space Jews: In Omniverse, he is renamed after Jewish journalist and news anchor Wolf Blitzer and his accent sounds vaguely Jewish as well.
• Suddenly Voiced: Just like for Snare-oh, the alien his DNA was sampled from couldn't talk except through growls. Ben, on the other hand, can vocally express himself just fine.
• Super-Scream: His signature ability consist in open his mouth in four mandibles to generate a powerful Sonic Scream.

Buzzshock

Buzzshock (OS-27)

Voiced by: Tara Strong (Original Series, Reboot), Eric Bauza (Omniverse)

Buzzshock was sampled from a Nosedeenian, also known as Megawhatts, from the Nosedeen Quasar. He can manipulate electricity, zip around at high speeds, and control electric devices.

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• Ascended Extra: Like Arctiguana, he originally only appeared in the Ben 10,000-centered episodes in the original series (discounting when his species was a Monster of the Week early in the show).
• Early-Bird Cameo: Buzzshock's species first appeared as an antagonistic force in the original series episode "Tourist Trap". Buzzshock would only appear twice more in Ben 10,000's timeline before Ben himself finally starts using the form in Omniverse.
• Overshadowed by Awesome: When Ben 10,000 used him in the original series, he seemed like a perfectly viable alien with a unique power. When Ben actually unlocks him in Omniverse, he has already unlocked several electric aliens who can do what Buzzshock does and are either better at it or more versatile. ^Note Frankenstrike and Brainstorm can create electromagnetic fields. Brainstorm can also analyze the environment and his opponents' moves to formulate strategies to defeat them, and create electrical constructs. AmpFibian is described as a "master of the electromagnetic spectrum", displays many of the same powers as Buzzshock while also having intangibility and the ability to breathe/use his powers underwater. Feedback can generate more powerful electrical blasts as well as having Energy Absorption beyond electricity The only technique Buzzshock possesses that is unique to him among the electric-based aliens is Self-Duplication but Ben has two other aliens who can use it without needing to absorb electricity or being cut in half.
• Shock and Awe: Holds the distinction of being the first electrokinetic alien introduced, though not the first one Ben gained the ability to turn into.
• Self-Duplication: Can duplicate if he has enough energy, or if he's cut in half.
• Suddenly Voiced: Has understandable speech, unlike the other Nosedeenians.
• The Trickster: Not Buzzshock himself, but Megawhatts as a species are well-known for constantly wreaking havoc due to their love of pranks and mischievous nature.

Cannonbolt

Cannonbolt/Ultimate Cannonbolt (OS-15, UA-06, RE-01)

^{Click here to see Ultimate Cannonbolt}

Voiced by: Fred Tatasciore (Original Series), Dee Bradley Baker (Alien Force, Ultimate Alien), David Kaye (Omniverse), Travis Willingham (Reboot)

Cannonbolt's DNA was sampled from an Arburian Pelarota, a shelled species widely believed to be extinct after the destruction of their homeworld by a being called the Great One. He can curl up into a ball and roll around at high speed. He was the first alien unlocked in the Omnitrix outside of the initial set of ten.

Ben 23's version is named Rollaway.

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• All There in the Manual: Ultimate Cannonbolt can supposedly fire his spikes, but this is never shown.
• Attack Reflector: On a few occasions Ben has used Cannonbolt's armored body to reflect attacks back at their senders.
• Boring, but Practical: On paper, Cannonbolt's abilities seem pretty unimpressive, only amounting to curling up into a ball to roll and/or bounce around the area he's in. In practice however, this actually makes Cannonbolt one of Ben's toughest aliens, as his incredible speed allows him to chase after enemies with ease, and his tough exterior lets him smack around opponents and even survive re-entering Earth's atmosphere from space.
• Back for the Finale: He made his Alien Force debut in "War of the Worlds".
• Breakout Character: Cannonbolt replaced Ghostfreak as a 'original 10' alien in the last two seasons of the original series and went from an additional alien to one of three that has appeared in every iteration of the franchise. In several media set during the Alien Force era he would be used as a substitute for Alien X in a lineup (such as in Vilgax Attacks) and is a starting alien in the reboot who stayed on the active playlist all the way to the end of the reboot alongside fellow popular mainstays Four Arms, Heatblast, Diamondhead, and XLR8. He's also one of the few original series aliens to gain an ultimate form in Ultimate Alien, alongside Wildmutt and Way Big.
• Cephalothorax: His face is on what would be his torso and his shoulders are seemingly above his eyes. This odd physiology is likely what enables him to curl up into a ball.
• Depending on the Artist: How Cannonbolt rolls up and out of his ball form shifts depending on the episode and season.
• Evolution Power-Up: Downplayed compared to most of Ben's ultimate aliens. Cannonbolt's current evolutionary stage already excels in combat efficiency so much that his perfect evolved form becomes only slightly more durable and bouncier in addition to just adding spikes.
• Heart Is an Awesome Power: His sole power is to curl up into a ball and throw himself at the enemy in Rolling Attacks. Sounds pretty lame, right? Well, not so much when your body possesses a shell that can resist atmospheric re-entry. He actually is one of Ben's most used aliens.
• Hyper-Destructive Bouncing Ball: In the original series, he bounced around wildly like a pinball. This is averted in Alien Force and Ultimate Alien, where Cannonbolt is slower and in Omniverse, where he has more control.
• Informed Ability: His evolved form supposedly has the ability to shoot spikes out of his shell to incapacitate his enemies, but this is never shown.
• Last of His Kind: Possibly, seeing how his planet was destroyed by the Great One.
• Lightning Bruiser: Once Ben masters Cannonbolt, the result is a Hyper-Destructive Bouncing Ball that pinballs at top speed and happens to be just as durable as Ben's other big aliens.
• Promotion to Opening Titles: In the original series, replacing Ghostfreak.
• Rolling Attack: His main thing is rolling around.
• Spectacular Spinning: Though it's a forward thrust thing, not just in place like a top.
• Stink Snub: Both Gwen and Rex have commented that Cannonbolt's musk is nasty, especially if one happens to be wrapped up in his ball form.
• Super-Toughness: His shell has been shown, on at least one occasion, to withstand being stabbed by Petrosapien crystal. He survived falling back to the Earth from re-entry!
• What Kind of Lame Power Is Heart, Anyway?:
  • Ben wrote Cannonbolt off as useless when he first got him, though once he got the hang of his abilities, he becomes one of Ben's most prominent aliens.
  • Notably, his Ultimate form is about the only thing Ben ever threw at Ultimate Aggregor to actually put Aggregor on the ropes.

Diamondhead

Diamondhead (OS-01, RE-04)

Voiced by Jim Ward (Original Series), Daran Norris (Race Against Time), Dee Bradley Baker (Alien Force, Ultimate Alien), Eric Bauza (Omniverse), Roger Craig Smith (Reboot)

Diamondhead's DNA was sampled from a Petrosapien, a race of green aliens comprised entirely of a diamond-like organic structure from planet Petropia. Petropia is a craggy, geode-like planet where silicon-based beings evolved to build a complex society of separate underground kingdoms. While there are several different gem-based races, from ruby to emerald to sapphire, each with its own distinct abilities and culture, most Petrosapiens now coexist peacefully. The planet is well-known for having been destroyed by Vilgax and later rebuilt by their guardian Sugilite.

Petrosapiens are crystalline beings whose bodies are formed entirely out of opaque gemstones and whose rock-hard physiologies make them all virtually invulnerable to physical attack. While jewel-like in appearance, Petrosapiens are no pretty boys. Their diamond-hard bodies make these fearsome warriors incredibly tough. Shards of the razor-sharp crystals jut out at numerous odd angles from their heads and bodies, discouraging physical contact, and also act as powerful weapons that can turn a car into confetti in a matter of seconds. Combined with their increased strength, Petrosapiens' shredding appendages can be especially devastating. Living prisms, Petrosapiens can refract light and beam-based weaponry, channeling them through their bodies and projecting them back at their source. Petrosapiens are particularly vulnerable to sonic vibrations. While a stereo blast might cause them to splinter, certain ultra-high-pitched sound waves can cause them to shatter — and no glue in this galaxy or the next can put a Petrosapien back together again.

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• Achilles' Heel: Sound waves is the best thing to damage Petrosapiens meaningfully.
• Appropriated Appelation: Trying not to give away Ben's identity nor trying to give away his own knowledge of aliens, Max called him a "diamond head guy" when congratulating him. This would stick with Ben, dubbing his Petrosapiens form Diamondhead.
• Attack Reflector: Thanks to his crystalline body, Diamondhead can reflect energy attacks away like a prism.
• Batman Can Breathe in Space: In Malgax Attacks, Diamondhead gets punched from Galvan Prime to Galvan B (its moon), showing that he can survive in the vacuum of space.
• The Big Guy: In the original series, he shares this role with Four Arms as one of Ben’s main physical aliens. Even by the end of Omniverse, he's remained one of Ben's toughest aliens in combat — he's defeated both Vilgax and Malware in a one-on-one fight, the only alien other than Way Big and Feedback respectively to accomplish this.
• Blade Below the Shoulder: Not naturally, but he can shape his hands into ones.
• Crystalline Creature: Petrosapiens are aliens made out of an organic green crystalline material. As Diamondhead, Ben can manipulate the atomic structure of his physiology at will, allowing him to form his limbs into diamond weapons such as blades and bludgeons, fire crystal shards from his body and create constructs out of crystals.
• Crystal Prison: He can encase people and objects in crystal, effectively freezing them. He uses this ability to defeat Malware in their first encounter.
• Gemstone Assault: Shooting crystal shards is his signature ability.
• Energy Absorption: In Alien Force, he inherited Chromastone's ability to absorb and channel energy attacks.
• Healing Factor: His ability to shape himself gives him a limited self-healing ability. If too much of his body is shattered, however, it won't work.
• Lantern Jaw of Justice: He has one in Omniverse. It's not as prominent as Alien X's, but it's still present.
• Mighty Glacier: Though not as strong or fast as Four Arms, Diamondhead compensates with projectiles, immensely higher durability and pseudo-Healing Factor.
• Nigh-Invulnerability: He is made of diamond-hard crystal, and even if you succeed in damaging him, he can regenerate. The only thing that has been shown to damage him permanently is sonic attacks.
• Perpetual Frowner: A trait of the Petrosapiens is that their heads' shape doesn't allow them to show much emotion.
• Shapeshifter Weapon: He has entire control over his physiology, allowing him to shapeshift his arms into blades, project crystal shards, and many other uses.
• Suspiciously Similar Substitute: To Chromastone in the season three premiere of Alien Force, even gaining his powers as well. The fact that was reformed from Chromastone's remains is just icing on the cake.
• Took a Level in Badass: While he was already one of Ben's favorites in the original series when he returned in Alien Force, he gained telekinetic control over his crystals and the ability to make them explode. He ended up trouncing Vilgax despite the fact that he had previously been unable to scratch him. He is not shown using these abilities in Omniverse, though he was strong enough in "And Then There Was Ben" to harm Vilgax even in a straight fistfight.

Ditto

Ditto (OS-41)

Voiced by Rob Paulsen

Ditto's DNA was sampled from a Splixson, a race of small humanoids able to create unlimited duplicates of themselves. The clones are all linked telepathically meaning they share thoughts and feelings, including pain.

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• Awesome, but Impractical: In spite of the fact he can outnumber his enemies, the clones all share the same pain, getting separated long distances results in a much longer Omnitrix time-outs, their cloning process is rather slow and inefficient, and they don't have much offensive power otherwise. Omniverse removes the pain restriction, lets them duplicate faster, and gives them Tunnel King-like digging abilities, but they're still fairly weak.
• Badass Adorable: He's an adorable alien that's around the height of a kid who likes praying pranks. However, he managed to destroy an army of mutant bugs in his debut episode, and also was able to rescue a woman and take down a gangster in a later episode.
• Can't Live Without You: If any of the clones were to die, they'd all die as well as the original.
• Crippling Overspecialization: He has the potential to create unlimited clones, and that's it. Other than that, he has subpar strength, speed, and power, and is considered one of Ben's physically weakest aliens.
• Doppelgänger Attack: He's only effective in combat when he takes advantage of his ability to surround his opponents.
• Ensemble Dark Horse: In-universe example as Ben mentions in Omniverse that according to websites, this alien form is a fan-favorite amongst girls, who consider him cute.
• Expy: Of the Warner Brothers, particularly Yakko Warner. Both Yakko and Ditto are voiced by Rob Paulsen, have vaguely similar appearances and names, and take part in a lot of silly, fast-paced dialogue.
• Flanderization: The Expy side was fairly subtle in the Original Series; in Omniverse, he is redesigned with more animal-like features and acts much more like them, down to having a chase scene based on their gags.
• Joke Character: Not only is his voice and behavior rather silly in general, his Weaksauce Weakness in the original series made him largely useless in a real fight. His debut has him win purely because his opponent had the exact same weakness, and his only other victory was against a normal human. In Omniverse, this is downplayed, as his weakness is no longer present, though things still tend to get a lot sillier whenever he shows up.
• Lethal Joke Character: While physically one of Ben's weakest aliens, he can be effective when used creatively.
• Overshadowed by Awesome: Echo Echo (an alien form introduced in Alien Force) possesses the same power as Ditto without the Weaksauce Weakness and adds a sonic scream to it, making him much more useful than Ditto.
• Retcon: In the Original Series, his duplication power had a very specific way of working: he split himself in half to duplicate, each clone was independent, they all felt each other's pain, and the death of even one of them would cause all the others to die. They wouldn't transform back into Ben until all of them were close enough to fuse back together, and would be pulled toward each other when they get close enough. In Omniverse, his duplication power works similarly to that of Echo Echo, with his clones appearing in a flash of green light, being able to vanish, and apparently all vanishing automatically when the original turns back to normal. Also, his Weaksauce Weakness of sharing pain with his clones is nowhere to be seen; numerous action scenes in the series show Ditto's clones being hurt with no effect on the others.
• Self-Duplication: His main power. Ditto can duplicate himself without limit.
• Tunnel King: In Omniverse, he quickly digs into the ground like a mole to escape Khyber's Panuncian.
• Weak, but Skilled: Compared to other aliens, Ditto is rather weak and lacks any strong power, but this can be balanced by using his ability to be in various places at the same time if using a good sense of tactics.
• Weaksauce Weakness: The clones all feel each others' pain. If even a single one of them dies, they all die. This weakness was seemingly retconned in Omniverse, possibly to limit his Overshadowed by Awesome status to Echo Echo.

Eon

Eon (Race Against Time)

• See Villains section

Eye Guy

Eye Guy (OS-48)

Voiced by Dee Bradley Baker (Original Series), Paul Eiding (Omniverse)

Eye Guy's DNA was sampled from an Opticoid, a reptilian race with 17 eyes across their body that can all fire a variety of lasers. Though none are on their face.

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• Butt-Monkey: Omniverse frequently puts him in places where his multiple eyes do more harm than good (such as getting drenched in an eye irritant alien's saliva).
• Chest Blaster: His strongest beam comes from a giant eye in his torso. He usually has to close the others to fire it.
• Combo Platter Powers: Eye Guy can fly, shoot lasers, shoot elemental lasers, see all around him, and otherwise do a lot more than you might expect a multi-eyed alien to do at a glance.
• Creepy Good: Half-bat, half-reptile, and eyes all over its body. He actually looks so much creepy that he was almost rejected by production because of it.
• Early-Bird Cameo: He appeared for the first time in an alternate scene of Secret of the Omnitrix's opening scene but chronologically appeared first in "Ben 10 vs. The Negative 10, Part 2".
• Energy Weapon: Most of his eyes shoot simple energy blasts.
• Exactly What It Says on the Tin: Amusingly, he's the only alien for which Ben and Ben 23 share the same name, which leads to Ben admitting that the name is lame.
• Extra Eyes: Has eyes everywhere, except where they should be.
• Eyeless Face: His face is the only place on his body without eyes.
• Eyes Do Not Belong There: He has eyes on his chest, on his limbs, on his torso...everywhere except his actual face.
• Eye Beams: Every eye can fire a laser beam. Some eyes have a different type of laser.
• Flanderization: In his first Omniverse appearance, he only made one eye-based pun as a passing remark about his name. In his later appearances, he's a Pungeon Master.
• An Ice Person: He can fire ice lasers from some of his eyes.
• Playing with Fire: One of his eyes can shoot beams of fire.
• Pungeon Master: In Omniverse, he has a tendency to make puns involving sight and the word "eye".
  Freezeghost (Ben 23): Cool. Get it?
  Eye Guy (Ben): Dude, watch the puns! Pretty soon, you use up all the eyeconic ones, and they just get cornea and cornea!
• Remember the New Guy?: Eye Guy was never given a proper introduction because he was created for an alternate opening of Secret Of The Omnitrix.
• Wall Crawling: He can cling to walls.

Four Arms

Four Arms (OS-02, RE-02)

Voiced by Richard McGonagle (Original Series, Galactic Racing), Dee Bradley Baker (Ultimate Alien), John DiMaggio (Omniverse and Reboot)

Four Arms' DNA was sampled from a Tetramand, powerful 12-foot tall aliens with four arms and armor-plated skin from planet Khoros. Khoros is a dusty and barbaric world where might makes right and survival is a constant struggle. Due to constant conflict, the planet's culture has long devolved, turning from a confederation of thriving city-states into a scorched and boundless wasteland. Nomadic tribes ruled by bloodthirsty warlords ceaselessly roam the landscape, seeking out relics of Khoros' past glory, all in hopes of rediscovering the secrets that will give them an advantage over their enemies.

Ben 23's version is named Handy Man.

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• The Big Guy: The biggest of Ben's aliens for most of the original series, and the one used primarily for tasks requiring strength.
• Destructive Savior: He's got super strength, but he's a bit clumsy from time to time.
• Dishing Out Dirt: Video games give him the ability to control the earth to a limited extent, most commonly pulling a boulder out of the ground and throwing it.
• In a Single Bound: His Super-Strength allows him to jump several stories high with little effort.
• Humanoid Aliens: Aside from having four arms and eyes, Tetramands are anatomically very similar to humans.
• Leeroy Jenkins: Most notable in the original series; whenever Ben would act incredibly impulsive during a fight, chances are he'd turn into Four Arms. Granted, an alien of this case makes that sort of strategy rather effective.
• Light Is Not Good: Kevin 11 as Four Arms had paler skin compared to Ben, but was significantly more villainous and dangerous than Ben ever was.
• Lightning Bruiser: While not the fastest of aliens, he's still speedy, super-strong, and has the ability to jump over skyscrapers. When compared to Humungousaur, Ben's other oft used heavy-hitter, Four Arms is significantly faster and more nimble.
• Manly Facial Hair: He's the muscular bruiser of Ben's team. He ditches the long hair for a carnival strongman-esque mustache in Omniverse.
• Monster Modesty: Being one of Ben's most humanoid aliens, he's the only one to wear clothes even in Ultimate Alien.
• Multi-Armed and Dangerous: As his name implies, he's got four arms, and he's one of Ben's strongest aliens in terms of sheer brute force.
• Punny Name: Forearms = Four Arms = 4 arms
• Red Is Heroic: He has red skin, and is one of Ben's most used and iconic aliens.
• Unstoppable Rage: During the original series, Ben's anger was especially prevalent in this form. His opponents who usually have him by the ropes get brutally beaten back the second he gets motivated (i.e when his family is threatened).
• Shockwave Clap: By slapping all four hands together he can generate a sonic shockwave.
• Super-Strength: His main power, and it's occasionally implied that he is stronger than Ben's other super-strong aliens (though obviously still outclassed by someone like Way Big or Alien X). For instance, he was able to overpower and defeat Looma in a one-on-one fight, something that Shocksquatch, Armodrillo, and Humungousaur all failed at.
• Spotlight-Stealing Squad: He was Ben's favorite alien and had the tendency of appearing for a significant amount of times in the original series; he appears in 27 episodes overall, the most of any Omnitrix alien. Toned down in the sequels, as Ben couldn't access him again until Ultimate Alien. Played straight again in Omniverse, where he is tied with XLR8 and Feedback as the most used transformation.
• Vocal Evolution: Richard McGonagle uses a deep growling voice early on in season 1 of the original series. By season 2, he uses the higher gargling tone Four Arms is known for.

Frankenstrike (Benvicktor)

Frankenstrike (Benvicktor) (OS-38)

Voiced by Michael Dorn (Original Series), David Kaye (Omniverse)

Frankenstrike's DNA was sampled from a Transylian, a race of large humanoids who augment themselves with powerful technology from Anur Transyl, a planet in the Anur System. They have the appearance of Frankenstein's monster.

Anur Transyl used to be home to two different races, the Transylians and the Vladats. Transylians — specifically their blood — were the Vladat's main source of food. The Transylians eventually rebelled against the Vladats, and, using superior technology that they had developed in secret, they hunted all Vladats on Anur Transyl into extinction and became the dominant species on their world.

Ben 23's version is named Lightning Volt.

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• '80s Hair: Sports a mullet in the original series and Ultimate Alien.
• Ascended Extra: He only made one appearance in the original series, but returned and is featured in more than one episode in Omniverse.
• Batman Can Breathe in Space: Frankenstrike can survive in the vacuum of space, which allows him to battle Zs'Skayr in his debut.
• Creepy Good: He looks like a stitched-together corpse, especially in Omniverse. Having no effect on Ben's personality, Frankenstrike is just as heroic as he is.
• Cyborg: Somehow, his mechanical parts are natural, since the Omnitrix reproduces them.
• Dark Is Not Evil: He looks like Frankenstein's monster, has a creepy looking appearance, and was sampled by an villainous alien, but Ben doesn't become any less heroic while using this guy.
• Flesh Golem: His Omniverse design looks like his body is stitched together, with the body parts being different colors.
• Frankenstein's Monster: He is based on one, though outside of appearance they don't have much in common.
• Genius Bruiser: It was vaguely implied in his debut (and confirmed by pop-up trivia) that Transylians possess some amount of Super-Intelligence (though not as high as Grey Matter). This gets retconned in Omniverse.
• In a Single Bound: He's a surprisingly good jumper. In this form, Ben 23 was able to jump out of the way of Way Big's massive cosmic ray.
• Mighty Glacier: Dr. Viktor displayed enough Super-Reflexes to react to and backhand XLR8, but his species is otherwise this. As Ben claims, "Frankenstrike isn't a running guy. He's a pounding guy!"
• No Name Given: He was never named on-screen, only being given the name Benvicktor in the credits of "Be Afraid of the Dark". He, along with Benwolf (Blitzwolfer) and Benmummy (Snare-oh) have been renamed in Omniverse.
• Progressively Prettier: Inverted. His design◊ in Omniverse is much uglier than the one he had back in the original series.
• Retcon: Transylians were originally stated to be the second smartest species in the galaxy behind Galvans, and Frankenstrike was said to be one of the aliens Ben 10,000 used to create a second Omnitrix for Kenny. This was later retconned, with Cerebrocrustaceans instead taking this position, and Transylians not having enhanced intelligence at all.
• Rubber-Forehead Aliens: Because he's heavily based on Frankenstein's Monster, a reanimated human corpse, he's the second most human-like alien Ben has transformed into (behind Eon). In his original design (but less so in Omniverse), he resembles a large and muscular human, just with glowing eyes and machinery sticking out of him.
• Shock and Awe: Ben's very first electrokinetic alien. He distinguishes himself from the others through being a Mighty Glacier.
• Shout-Out: To Mary Shelley's Frankenstein. His electrical powers are a reference to the lightning strike that brought the monster to life.
• Steampunk: Anur Transyl is like this, as is Frankenstrike himself.
• Super-Reflexes: Dr. Vicktor was able to backhand a speeding XLR8 (and he wasn't even aware of Ben's presence before that).
• Super-Strength: Dr. Vicktor could go toe to toe with Four Arms.
• Technopath: Frankenstrike wasn't seen doing any of this, but his genetic donor operated several machines (and even a rocket engine) by plugging them into the towers on his back.
• The Dog Bites Back: According to the species' backstory, the Transylians started out as the Vladats' slaves and power supply, resulting in them eventually rebelling and exterminating the Vladats.

Ghostfreak

Ghostfreak (OS-04)

Voiced by Steve Blum (Original Series, Omniverse), Jeff Bennett (Alien Force, Ultimate Alien)

Ghostfreak's DNA was sampled from an Ectonurite, a race of incorporeal ghost-like aliens who can possess other creatures hailing from Anur Phaetos, a planet in the dark Anur System. Though many legends have long spoken of it as the center from where galactic chaos springs forth, not much is known about the shadowy world of Anur Phaetos. Some say it is more a dimensional realm than a planet. Since no voyager has ever returned to tell tales of a visit and there is scant evidence as to the true nature of its existence, Anur Phaetos remains the galaxy’s most dangerous mystery.

It's later revealed the Ectonurite DNA for Ghostfreak was sampled from Zs'Skayr, the Ecto-Lord of Anur Phaetos.

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• Adapted Out: He is not present among Ben's original 10 aliens in the reboot, having been replaced with Cannonbolt.
• And I Must Scream: Unlike other species sampled for the Omnitrix, even the smallest sample of DNA contains an Ectonurite's consciousness. A copy of Zs'Skayr's consciousness was subsequently trapped inside the Omnitrix and fully aware the entire time. His fight with Zombozo showed signs of Zs'Skayr taking over.
• Awesome, but Impractical: When using Ghostfreak, Ben can do things such as turn invisible, phase through objects and people via intangibility, and even possess people and manipulate their bodies to do what he wants. The downside? The everlasting threat of Ben suffering a Split-Personality Takeover.
• Badass Boast: To Zombozo in "Last Laugh":
  Ben/Ghostfeak: I just figured out there's something I'm even more afraid of than you: (punches Zombozo and turns invisible) losing my family to some goofball emotional vampire. In other words... (punches Zombozo by the nose and turns invisible again) ...you're going down, clown.
• Chained by Fashion: He has these as part of his design in ''Omniverse''◊.
• Combat Tentacles: Omniverse shows that that the tentacles under his second skin are strong enough to lift a bus full of people.
• Confusion Fu: It's hard to figure out where he going to come at you from if he makes effective use of his invisibility.
• Creepy Good: Ben can get very creepy when he turns into Ghostfreak, but he remains a good guy... as long as Zs'Skayr doesn't take over.
• Cyclops: he has a single eye, which can move on every part of his body.
• Dangerous Forbidden Technique: Even after regaining the form, Ben was afraid to use it due to the fear of Zs'Skayr taking over. Now that Zs'Skayr is no longer in the Omnitrix, Ghostfreak exists independently from him, so this no longer an issue.
• Dark Is Not Evil: Double subverted. Despite being one of Ben's original 10 aliens, Ghostfreak was hinted in "Last Laugh" to have something darker to him. It was later revealed that he was sampled from the evil overlord Zs'Skayr and trapped inside the Omnitrix, eventually escaping and becoming one of Ben's most fearsome enemies. When Ben regains access to him, he (understandably) puts off using him for years, afraid of what had happened with him before. However, in Omniverse, he states that he still feels like himself when using him, which allows him to return Ghostfreak to his active playlist.
• A Day in the Limelight: "Ghostfreaked Out" revolves around him breaking free from the Omnitrix.
• The Dreaded: Once Ben and his allies become aware of just how much trouble Ghostfreak is, they're understandably put off from using him or otherwise getting involved with his species. Even Kevin notes in Alien Force's "Save the Last Dance" that he never liked using Ghostfreak's abilities when he had absorbed the Omnitrix, despite not knowing why he was so dangerous in the first place.
• Eldritch Abomination: Ghostfreak's true form is a horrific creature with an upside down Skull for a Head that only has one eye and has Absurdly Sharp Claws for hands with tentacles writhing from his chest. No wonder Ben was so frightened to change back into this guy for years.
• Eyes Do Not Belong There: Can move his eye around his body while in his second skin. Without it, his eye is stuck in place because his head is a skull.
• Grand Theft Me: Heroic example — Ben defeats Darkstar by possessing his body. Before that, however, Zs'Skayr existed as Ghostfreak, and his personality slowly overwhelmed Ben's over time the more he used the form.
• Horrifying the Horror: Ben managed to scare the crap out of Zombozo just by using this form.
• Intangible Man: He wouldn't be called Ghostfreak if he didn't have these powers. Though there are chemicals that can neutralize this ability.
• Informed Ability: The Bandai profile mentions Ectonurites possess some amount of psychic powers. Ben was never seen using those abilities as Ghostfreak. Zs'Skayr is eventually shown using those abilities, but only in his true form, which Ben never used.
• Mook Horror Show: Famous for delivering one of the greatest examples of this trope in the entire franchise to Zombozo.
• Our Ghosts Are Different:
  • They are a species of aliens from a mysterious sector called Anur Phaetos, are connected through a Hive Mind that can manifest through even the slightest sample of their DNA, and are Weakened by the Light. They can, however, wear a second skin to protect them from it, at the cost of weakening most of their powers. Said skin gives them their ghost-like appearance, but behind it, they look like creatures with black-and-white tentacles writhing everywhere, an upside-down cyclopean skull, and large claws.
  • Omniverse dips closer to the conventional ghost; Ben boasts that, in this form, he is not technically alive and thus immune to Darkstar's Life Drain abilities. Word of God has stated that Ectonurites are alive; though their concept of "life" is very different from other sapient life forms.
• Red Eyes, Take Warning: In the opening of the first two seasons of the original series, Ghostfreak's eye is red as opposed to purple, foreshadowing that he's much more dangerous than he initially seems...
• Story-Breaker Power: In a conflict against a single, powerful opponent, Ghostfreak can immediately end things by just turning invisible, flying up to them, and possessing them. The series occasionally downplays this by pitting him against enemies that can resist his possession, such as Ma Vreedle (through sheer willpower) or a zombie (due to not having a mind to control).
• Superpowered Evil Side: Zs'Skayr started out as this before his Enemy Without. Ben now has complete control over Ghostfreak, as Zs'skayr is no longer inside the Omnitrix, and when he uses the form in "Mystery, Incorporeal" he says that he still feels like himself.
• Took a Level in Badass: In the original series, Ghostfreak wasn't much good in a fight via the fact that he was too frail to do any serious damage and all Ben could do with him was turn invisible/intangible or try to scare people. In Omniverse, he can share his invisibility with others in addition to being immune to Life Drain and aware of how to use his possession abilities and his tentacles can launch out and are strong enough to hold a bus.
• Vocal Evolution: Steve Blum's performance in Omniverse is much less raspy and villainous-sounding. It fits because Ben is now in complete control of the form.
• Weakened by the Light: Though Ghostfreak wears a second skin that protects him from such a weakness. However, he is still vulnerable to fire.

Grey Matter

Grey Matter/Ultimate Grey Matter (OS-02, RE-03)

^{Click here to see Ultimate Grey Matter as used by Albedo}

Voiced by Richard Steven Horvitz (Original Series), Carlos Alazraqui (Race Against Time), Eric Bauza (Omniverse), Todd Haberkorn (Reboot)

Triggering the correct sequence of synapses should allow me some rudimentary motor control. Sure wish I knew what I was talking about.

Grey Matter's DNA was sampled from a Galvan, a species consisting of small, incredibly intelligent frog-like beings from Galvan Prime. Despite its diminutive scale, Galvan Prime is one of the most scientifically advanced worlds in the galaxy. Miniature skyscrapers and ultra-fast causeways litter the landscape, leaving little room for nature. First kept as pets and then employed by other species as industrial technicians, spies, and saboteurs, Galvans were smart enough to keep the best secrets for themselves, eventually amassing enough knowledge to build a powerful empire of their own. In a chaotic world of intrigue and innovation, the coldly technocratic inhabitants of Galvan Prime work tirelessly and consume massive resources to keep an ever-tightening grip over their former masters.

Azmuth, the creator of the Omnitrix, is later revealed to be himself a Galvan.

Ben 23's version is named Brainfrog.

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• Adaptational Badass: In the reboot. He isn't any stronger physically, but he has Awesomeness by Analysis like Brainstorm.
  • And then there is the Omni-Enhanced form...
• Author Appeal: He is Derrick J. Wyatt's favorite alien. Not only is brought back in Omniverse as a result, but his species has a much bigger role than in any previous entry of the franchise.
• Cephalothorax: Ultimate Grey Matter is a M.O.D.O.K. Expy, so naturally this is in play.
• A Day in the Limelight: The Original Series episode "A Small Problem" features Ben stuck as Grey Matter for almost the entire episode, with no other Omnitrix aliens making an appearance.
• Dr. Brainpart: "Grey Matter" is the main component of several organs of the central nervous system, including the brain.
• Eye Beams: Ultimate Grey Matter can fire beams from his third eye which have the effect of negating Ben's transformations.
• Gadgeteer Genius: Even at 10 years old, Grey Matter possesses enough intelligence to work advanced machines and build highly advanced weapons.
• Heart Is an Awesome Power: Grey Matter's size makes him a fitting alien to escape bigger predators or hide, and his high intellect doesn't seem useless any more when you can use him to build a solar gun out of scraps. An even more extreme example in "Ken 10", where Ken uses him to unlock the Master Code of his Omnitrix.
• Improbably High I.Q.: "The Vengers" shows Brainstorm's IQ to be 10^30. If Galvans are truly smarter than Cerebrocrustaceans, then this trope must be in effect.
• Incredible Shrinking Man: Ben goes from whatever size he normally is, to about 6 inches tall. invoked
• Informed Ability: While the show's lore suggests that Galvans are smarter than Cerebrocrustaceans, in context the matter is up for debate. Brainstorm has generally done more with his Super-Intelligence than Grey Matter has, running physics simulations in his head and accurately predicting every move his opponents will make, for example, while Grey Matter's Super-Intelligence has so far mostly applied to creating new technology and nothing more. He has had a few Awesomeness by Analysis moments scattered here and there, though, such as defeating Tyrannopede by copying Khyber's Pressure Point technique.
• Leitmotif: A silly, fast-paced theme would often play for his scenes in the original series to reflect his mostly comical status.
• Lethal Joke Character: A Running Gag in the original series was Ben's tendency to mistransform into Grey Matter, usually in situations where his small size makes him very impractical, such as a fight. However, his intelligence, if well-used, can prove extremely useful and deadly.
• Mini-Mecha: His Omni-Enhanced form in the reboot puts him in one, adding (as he puts it) some brawns to his brains.
• My Brain Is Big: Ultimate Grey Matter, while being roughly the same size as the normal form, is mostly brain.
• Overshadowed by Awesome: While Grey Matter's high intelligence and small size were quite useful in the original series, Alien Force introduced Brainstorm, who also possesses high intelligence that can predict his opponent's moves amongst other things, and can combine it with Shock and Awe and Mind over Matter abilities. Then, Alien Swarm gave us Nanomech, who is even smaller than Grey Matter, can fly and shoot electrical blasts. In Omniverse, we got Ball Weevil who was small, highly mobile and had explosive firepower.
• Shorter Means Smarter: The smallest alien until the introduction of Nanomech, and the smartest alien Ben has.
• Shout-Out: Ultimate Grey Matter's form looks quite similar to M.O.D.O.K.
• The Smart Guy: His main (and only) power is intelligence. As he has little to no physical ability (save for sharp teeth) he relies on his intellect to outsmart his enemies. Downplayed with his evolved form, which, while still small, does have some offensive capabiilities.
• Super-Intelligence: Grey Matter is implied at a few points to be even smarter than Brainstorm, smart enough to operate complex technology on instinct, and build high-tech weapons from scraps. Notably, Ben is able to understand Pyxxyl, the Lovely Duck ship's AI as Grey Matter, but unable to in human form.
• Technobabble: Often speaks like this when he's analyzing alien tech. Even Ben admits he doesn't understand what it means.
• Ultimate Life Form: The Galvan species is considered the closest thing the Ben 10 Universe has to a dominant species in the Galaxy.
• Wall Crawl: The mucus his skin secretes allows him to adhere to surfaces to climb them.
• Weak, but Skilled: His tiny size makes him the weakest alien on the watch physically, but it also gives him far more maneuverability and lets him fully utilize the enhanced intelligence of a Galvan to overcome large enemies.
• What Kind of Lame Power Is Heart, Anyway?: When Ben was ten years old, Grey Matter was his least favorite alien because of the low physical ability.

Heatblast

Heatblast (OS-01, RE-01)

Voiced by Steve Blum (Original Series), David Franklin (Race Against Time), Dee Bradley Baker (Ultimate Alien), David Kaye (Omniverse), Daryl Sabara (Reboot)

Heatblast's DNA was sampled from a Pyronite, a race of magma-based aliens from Pyros. Of all the homeworlds in the galaxy, Pyros is unique in that it is actually a fully functioning sun. Pyros is a wide-open landscape of endless natural wonders: Infernal plumes erupt miles into the atmosphere, and raging rivers of molten lava cut massive swaths across the fire-filled tundra. Magma based, all of its inhabitants are composed of flame-like energy. Drawing strength and nourishment from an almost limitless power source, this world's inhabitants are in need of little else.

Ben 23's version is named Charcoal Man.

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• The Cameo: Heatblast was apparently unlocked offscreen after season 2 of Alien Force, most likely through scanning Alan Albright. The hologram of Heatblast appeared a few times in the third season but Ben is never seen transforming into him during this time onscreen.
• Convection, Schmonvection: This alien is from, and is in essence, a walking talking sun. Nobody is harmed or complains about the heat from being in close proximity to him. He can even pick things up without burning them, and literally going supernova in one episode does nothing but evaporate the Fountain of Youth. This most likely doubles as Hollywood Fire. The true severity of Heatblast's powers might not be all that appropriate to show in a family-friendly franchise, so it had to be toned down a bit.
• Demoted to Extra: Heatblast was one of Ben's most used aliens in the first season but became much less frequently used in subsequent seasons ^note  He appears in 8 episodes in the first season, then 2 in the second, 4 in the third, and 3 in the fourth . He got a few appearances in later seasons of Ultimate Alien after only cameoing in Alien Force as a hologram but notably was absent from the middle part of Omniverse after getting roles in the early and later parts of the show.
• Dishing Out Dirt: A limited variant — Heatblast can lift off a piece of the ground to surf on, this being his primary method of transport in liue of using his fire powers to propel himself.
• Elemental Absorption: He can absorb fire.
• Elemental Powers: He has pyrokinesis when healthy, and cryokinesis when infected with a cold.
• Elemental Punch: As shown in his fight with Victor, he can wreath his hands in fire to increase the intensity of his punches.
• Flying Firepower: In later episodes, Ben learned to use his fire abilities to propel himself in the air and fly.
  • In the reboot, his Omni-Enhanced form has a jet pack.
• An Ice Person: In original series episode "Side Effects", Heatblast's powers are inverted to instead generate ice as a result of Ben's cold altering his powers. Tellingly, while all the other aliens' powers are roadblocked, Heatblast is the only one whose inverted powers end up being a benefit for one occasion.
• Jack of All Stats: Fast, strong and durable (though not in the levels of the other aliens). Add in pyrokinesis and you have one tough customer.
• Living Lava: His body is composed entirely of plasma and volcanic rocks.
• One-Man Army: Downplayed. In the original series episode "Secrets", he was easily able to one-shot an entire group of Vilgax's drones. In Ben 10: Ultimate Alien he was able to fight on par and defeat another One-Man Army in the form of King Victor.
• Playing with Fire: He can produce fire, absorb it and wreathe parts of his body in it.
• The Power of the Sun: What with Pyronites being born on stars and all.
• Recurring Element: The first alien Ben used was Heatblast. Following this, generally, the first alien anyone uses for the first time is Heatblast or someone with fire-based abilities comparable to him.
  • The first alien Kevin hybridized with after absorbing the Omnitrix was Heatblast. This was also the first power he demonstrated at the end of his episode. The first alien Gwen transforms into is Heatblast as well (natch given it was a retelling of Ben's origin with Gwen instead).
  • The first mutation Dr. Amino causes with the Omnitrix's faceplate creates a giant Heatblast/bat hybrid.
  • Both movies released during original series run used Heatblast as first alien.^note Although there are alternate versions of the former which have XLR8 or Eye Guy as the first alien used instead
  • The first alien he transforms into in Alien Force is Swampfire, an alien combining the general abilities of Heatblast and Wildvine. The first Half-Human Hybrid they find as the story arc builds is Half-Heatblast.
  • The first Ultimate Alien he tries out is Ultimate Swampfire. The first alien that younger Ben transforms into after being brought to the future is Heatblast.
  • The first alien form that Alpha absorbs from the Ultimatrix is Heatblast.
  • The first alien predator introduced in Omniverse is Crabdozer, Heatblast's predator. The first composite form Khyber uses after shacking up with Skurd was Crabdozer as well.
• Shout-Out: When his head goes out, his face looks like Iron Man.
• Super-Speed: In the reboot, his Omni-Enhanced form can fly faster than XLR8 can run, as shown in "High Stress Express".
• Super-Toughness: While not Ben's most durable alien, he was still able to get thrown through three buildings while on the receiving end of a Curb-Stomp Battle from Vilgax and was no worse for wear.
• Swiss-Army Superpower: Besides the standard Super-Strength and Super-Toughness, Heatblast's sole power is control over fire. He can use this power to blast enemies, absorb heat, melt objects, fly, and enhance his punches.
• Weaksauce Weakness: Subverted. Just pouring or spraying water on him isn't gonna kill him. One episode of the original series even has him swimming in a pool with no detriment, and his flames spark right up again the moment he gets out. Omniverse even has him able to produce enough heat underwater to melt metal.

Ripjaws

Ripjaws (OS-03)

Voiced by Fred Tatasciore (Original Series), Dee Bradley Baker (Ultimate Alien), Eric Bauza (Omniverse)

Ripjaws' DNA was sampled from a Piscciss Volann, a race of aquatic fish aliens from Pisciss. The water world of Piscciss is one of extreme danger. Thousands of exotic species live in a vast anarchic ocean of eat or be eaten. While most Pisccians live in schools because of the safety in numbers, there is still little feeling among these cold-blooded kinfolk. A world of strong currents and highly stratified environments, the deeper one dives on Piscciss, the darker and more dangerous it becomes.

While the Volanns are not the biggest fish in the Pisccian sea, they are definitely the most hazardous. A monstrous hybrid of alligator, eel, and leech, Volanns are incredible swimmers who are amazingly fast and agile in the water. A Volanns' huge mouth filled with rows of razor-sharp teeth can chomp through almost anything. Their lower jaw unhinges, enabling them to grip large objects with the strength on an industrial-sized vise. Sinewy and covered in slimy scales, Volanns use their claw-tipped fins to fight in a unique "zero gravity" style that makes them masters of aquatic combat. They can dive deep to the ocean’s floor, easily withstanding the crushing pressure while continuing to breathe through their gills. For all their skill in the water, Piscciss Volanns are unable to walk and are basically useless above the waves. Volanns must keep their gills wet or they'll dehydrate rapidly, which can actually result in their death on dry land. As members of their species grow older, however, their ability to spend time on dry land increases, making them more amphibious in adulthood.

Ben 23's version is named Fish Fingers.

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• Abled in the Adaptation: The reboot Ripjaws used by Gwen 10 has the same respirator tech the reoccurring Piscciss Volann prisoner wears, allowing Ripjaws in the reboot to be active outside of water a lot more stably than the classic Ripjaws was able to be used.
• Adapted Out: He is not present among Ben's original ten aliens in the reboot, having been replaced by Overflow. He is used by Gwen 10 in the finale episode of the reboot however.
• Awesome, but Impractical: He’s a massive fish creature with an incredibly strong bite and impressive strength, but he can barely do anything outside of the water due to a constant need to be hydrated, making him almost useless unless Ben needs a aquatic alien (which he rarely does).
• Captain Fishman: He's the token water-hero of the original line-up, including being a Joke Character.
• Chuck Cunningham Syndrome: He does not appear at all in the third season of the original series. His icon in the watch does appear in a few episodes and Ben explicitly attempts to transform into him twice; neither times is he successful, however.
• Creepy Good: Seriously, just look at his face.
• Crippling Overspecialization: He excels in mobility, territorial control, and power underwater, but this is undercut by the fact he needs water to breathe, and is thus mostly useless on dry land. Downplayed in the sequels, where he can spend more time above water, but his abilities are still too situational for him to get more use.
• Joke Character: He's this on dry land. He's basically dead weight without water, helplessly suffocating until he either changes back or finds a water source.
• Lightning Bruiser: He's this underwater. As he's specifically meant to be used in water, he's an extraordinarily strong and fast swimmer, and his bite is nothing short of deadly.
• More Teeth than the Osmond Family: He has a lot of teeth in his mouth in the original series. In Ultimate Alien, he was given more traditional fish lips. The teeth returned in Omniverse.
• Our Mermaids Are Different: He has a unique mermaid-like tail when he's underwater.
• Out of Focus: Appears the least out of the original 10 aliens, with the exception of Ghostfreak. Unlike Ghostfreak, whose lack of use was a specific plot point, Ripjaws just doesn't get used much due to being so situational.
• Overshadowed by Awesome: In the sequels, Ben gets access to many other aquatic aliens that can also survive on land, making Ripjaws largely obsolete.
• Retcon: Early supplementary material stated that Piscciss Volanns had no legs and that Ripjaws' were created via the Omnitrix modifying his form. Secret of the Omnitrix debunked this by showing a criminal Volanns in Incarcecon standing on legs just like Ripjaws, with all future Volanns featured in the franchise able to change from legs to tails like Ripjaws. His "tail" from then on became a complex carapace that wraps around his legs in water and shrinks into a pseudo-loincloth when on land.
• Running Gag: A pair of minor ones:
  • If he's up against a water-based threat (especially in season 3), expect a few aliens that don't do well with water before Ripjaws shows up, if at all.
  • Conversely, expect about 50% or more of the transformations into Ripjaws to be accompanied by a complaint of the Omnitrix messing with Ben.
• Super Not-Drowning Skills: He's aquatic.
• This Looks Like a Job for Aquaman: Used almost specifically for aquatic environments, and is useless anywhere else.
  • One of the last times he was seen in the original series was when Ben used him in a beach episode. Surfing.
  • Although occasionally this could be subverted, as shown in Ripjaws' last appearance in the Original Series, where he proceeded to start tearing chunks out of a bad guy's car, despite being in the desert and the car MOVING.
• Weaksauce Weakness: He can't survive without water for long. As a result, he is one of Ben's least used aliens. This is improved upon in the sequel series but doesn't see him used much more at that point due to there being tons of characters, many of which can survive in and out of water.
• You Don't Look Like You: His Ultimate Alien design drastically alters his appearance, giving him a catfish-like face and (ironically enough) greatly reduced jaws to resemble Magister Pyke. His Omniverse design overhauls him again to more closely resemble the original design.

Snare-oh (Benmummy)

Snare-oh (Benmummy) (OS-37)

Voiced by Richard Green (Original Series), Kevin Michael Richardson (Omniverse)

Snare-oh's DNA was sampled from a Thep Khufan, an alien species that is comprised entirely of bandage-like strips from Anur Khufos, a planet in the Anur System. Anur Khufos is a planet rich in Corrodium, a substance known for being extremely radio-active and causing horrible mutations. As such, the Thep Khufan had to adapt to this to survive.

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• Ascended Extra: He only made two brief appearances in the original series. He's used more often in Omniverse.
• Combat Tentacles: The bandages that make up his body actually are thin, but very strong tentacles he has complete control over. They can be used to effortlessly lift Diamondhead.
• Confusion Fu: His Combat Tentacles and Rubber Man powers naturally give him a very unorthodox attack pattern.
• Dark Is Not Evil: As with the other Anur System aliens, although Snare-Oh's DNA was sampled from a villain, Ben uses his powers for good instead of evil.
• Forgot About His Powers: In "The Frogs of War, Part One", Ben apparently hadn't used this form for so long that he'd forgotten what it could do.
• Healing Factor: Can easily be torn apart and even shredded to bits, and reform nearly instantly.
• How Do I Shot Web?: Initially, Ben doesn't really know how to use Snare-Oh's powers, and spends a good deal of a fight with the Yenaldooshi (the DNA sample of Blitzwolfer) getting his ass beaten. He does figure out how to use him in Omniverse, utilizing him to a great degree when battling Psyphon.
• Losing Your Head: "Secret of Dos Santos" reveals that his faceplate can be detached from his bandages with no ill effect.
• Mummy: His look is based on one, though otherwise, it follows almost none of the clichés usually associated with the trope.
• Mummy Wrap: His primary power; all these bandages actually are tentacles he can use to grab anything and anyone.
• No Name Given: Like Frankenstrike, he was never named on-screen, only being given the name Benmummy in the credits of “The Return”. When he returns in Omniverse, his name is still not stated on-screen, but he is listed as Snare-oh in the credits of "The Frogs of War: Part 1".
• No-Sell: Thep Khufan are completely immune to the horrible mutations corrodium radiations usually cause, allowing them to carry the substance inside their body with no ill side effects. Ben shows this ability as well while in alien form, but it's unclear if it's his aliens' ability or just thanks to the fact he is transforming through the Omnitrix.
• One-Shot Character: He only appeared in one episode of the original series, although he did make a brief appearance as a Continuity Nod in a later episode. When he returns in Omniverse, his name is still not stated, but the credits for "The Frogs of War: Part 1" list him as Snare-oh.
• Overshadowed by Awesome: While he's capable enough in a fight on his own, by the time he returned in Omniverse, Ben already had access to quite a few Rubber Man aliens with a wider range of abilities outside of their elasticity. The only power Snare-Oh really has over them is his immunity to Corrodium, which never showed up past the original series.
• Rubber Man: He can shapeshift his bandages to either fit through tight spots or be used as a makeshift cushion.
• Shout-Out: In Omniverse, his voice is based on Boris Karloff.
• Suddenly Voiced: Ben can speak as Snare-oh, despite the fact that the alien he got the DNA sample from is The Speechless.
• Took a Level in Badass: In his first appearance, Snare-Oh spent his entire screentime getting his ass beat by the Yelandooshi, with him not knowing how to use any of his powers. By the time of Omniverse, Ben has mastered the form enough to be able to take down Psyphon of all people with little effort.
• Vocal Evolution: Goes from having a very deep voice in the Original Series to having a more high-pitched one in Omniverse
• Zombie Gait: Averted — he's actually one of the more nimble aliens Ben can use.

Spitter

Spitter (OS-27)

Voiced by Dee Bradley Baker (Original Series)

Spitter's DNA was sampled from a Spheroid from planet Scalpasc. The present-day Ben never actually used him, instead he was primarily used by versions of Ben 10,000 and his son Ken.

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• Ascended Extra: Subverted. Just like Arctiguana and Buzzshock, he appeared as one of Ben 10,000's aliens. Unlike them, however, he has never made an appearance since the original series aside from appearing in the intro for Ultimate Alien. He's thus one of only four aliens to not appear in Omniverse and like Fasttrack, his species aren't even given representatives.
• The Cameo: He tends to make very brief appearances.
• Chuck Cunningham Syndrome: He was last used in "Ken 10", and present-day Ben was never seen using him. The writers of Omniverse can't even agree if Ben has unlocked him yet.
• Inflating Body Gag: He inflates whenever he spits.
• Super Spit: He can spit a powerful blast of slime.
• The Voiceless: The only alien alongside Wildmutt who has never spoken onscreen, and it's unknown if he even can given his minimal screentime.

Stinkfly

Stinkfly (OS-02, RE-06)

Voiced by Dee Bradley Baker (Original Series, Ultimate Alien, Omniverse), Greg Cipes (Reboot)

Stinkfly's DNA was sampled from a Lepidopterran, a race of winged insect-like aliens from planet Lepidopterra. With its advanced and highly specialized ecosystem, Lepidopterra is a generally peaceful swamp planet whose numerous species live among a fantastic variety of giant plants. Residing in a complex of giant hives each ruled by its own queen, Lepidopterrans are the predominant inhabitants of their planet. Life on this planet is seasonal, and every species does its part to make sure the flora continues to produce its fruit so that all can live together in harmony as they have for countless eons.

Ben 23's version is named Big Bug.

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• Beware My Stinger Tail: He has a bee/scorpion-like stinger that is sharp enough to rip through metal.
• Big Creepy-Crawlies: Basically a giant alien fly.
• Breath Weapon: Shoots slime from his mouth and eyes. He can alter the properties of this goo, making them either flammable or fire retardant, for example.
• Energy Weapon: When a time-traveling 10-year-old Ben used him in Ultimate Alien, his eyes shot lasers instead of goo.
• Eye on a Stalk: Stinkfly has four eyestalks arranged around its head, with the Omnitrix symbol in the middle resembling a single large eye; possibly an allusion to insects with patterns designed to mimic another creature.
• Fartillery: When Ben is reduced to a four-year-old, this is Stinkyfly's power.
• Flight: While he never was Ben's only flyer (Ghostfreak was one as well, and Heatblast later was revealed to be one), this is still the main use Ben had of him most of the time.
• Fragile Speedster: He's a highly agile flyer, but compensates with poor endurance. A well-placed hit often swats him out of the sky.
• Goo It Up: He can launch goo from his eyes and mouth.
• Overshadowed by Awesome: While Stinkfly has an array of useful powers his role of main flier has long been usurped by a variety of other aliens that can fly similarly well and offer more than he does (more power, faster speed, greater durability, better ground-based combat, etc.). Even in Omniverse where Jetray —his main competition— was absent, he appeared rather infrequently, especially for one of the original aliens.
• Stink Snub: Stated several times by other characters that Stinkfly, well... stinks.
• Super-Deformed: The adults of the species show that his features will exaggerate after maturing. His eyes, tail and the tips of his legs are all disproportionately large relative to his body, like some kind of homunculus modeling.
• Token Flyer: Was Ben's go-to choice for flight in the original series, as Ghostfreak escaped from the Omnitrix and Heatblast's flight powers were much less reliable. After Ben starts unlocking more flying aliens in the sequels (most of which tend to be better choices than Stinkfly in most situations), his uniqueness is heavily diminished.
• Weaksauce Weakness: Stinkfly's wings are very vulnerable. Even to water.
• You Don't Look Like You:
  • In Omniverse, he receives one of the most notable redesigns with a complete overhaul of his face, ditching the pure black and flat look for a green face with a massive underbite, along with an altered body shape to make him even closer to a bug. These changes cannot be explained with age, as 11-year old Ben also has this Stinkfly with the same face.
  • He receives the most drastic redesign in the reboot series by far, not only taking on a more humanoid form, but having only two (completely different-looking) eyes, losing his tail, and even changing in color from green to blue. He doesn't even shoot slime from his mouth and eyes anymore, instead firing it out of holes in his shoulders. This happened due to his original design being considered "too scary" and being hard to animate.

Upchuck

Upchuck (OS-39)

Voiced by Dave Wittenberg (Original Series), Dee Bradley Baker (Alien Force, Ultimate Alien), Eric Bauza (Omniverse)

I'll chew you up and spit you out!

Upchuck's DNA was sampled from a Gourmand from Peptos XI, a small green species with large appetites. Gourmands have three prehensible tongues, seven acid-filled stomachs, and diamond-hard teeth, allowing them to eat almost anything. Once they feed, they are able to project deadly energy beams from their mouths.

Ben 23's version is named Vomit Man.

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• Adapted Out: After being one of five aliens to appear in every classic series, Upchuck was nowhere to be seen in the reboot. No Gourmands even appeared in it, unlike Ghostfreak whose species at least appeared.
• Beware the Silly Ones: Upchuck doesn't seem very imposing at first glance, and his power to eat anything sounds completely ridiculous at first, even to Ben. He's ultimately shown to be one of Ben's most powerful aliens — he can easily swallow the energy equivalent of a star, and in Omniverse he's one of the few races confirmed to lack a predator. The only other known race to share that trait are humans.
  Upchuck: Top of the food chain, baby! Upchuck doesn't have a natural predator!
• Big Eater: Except he can't digest what is normally considered "food", leading to some rather bizarre culinary choices on his part.
• Breath Weapon: Upchuck can fire laser beams from his mouth (or as he called them in Upchuck's debut 'exploding loogies'), though it has only been used twice (first against the Forever King in the original series then later on against Chromastone (who had escaped from the Omnitrix) in Alien Force. He prefers to fire exploding green energy pellets instead.
• Counter-Attack: Upchuck's abilities are often used in this matter, being able to swallow enemy attacks and fire them right back.
• Eating the Enemy: Upchuck can devour practically anything, which includes enemies. Of course, if they're alive he usually spits them back out.
• Extreme Omnivore: He can eat everything... except, ironically, regular food (though this was retconned later). And by everything, an episode on Omniverse shows that the species as a whole has Plan Omega, which is to eat their entire planet!
• Glass Cannon: A given since he's the size of a woodchuck. Whatever he spis back deals serious damage, but he's not durable.
• Meaningful Name: Wanna know why Upchuck's species comes from Peptos XI? Because of the species enacting Plan Omega — which is to devour their entire planet — which they've done 10 other times in the past!
• Multipurpose Tongue: Upchuck's four extendable tongues are very strong, which he can use to lift absurdly heavy objects or trip foes.
• Overly-Long Tongue: Again, Upchuck has four very strong, extendable tongues.
• Palette Swap: There are two races of Gourmands; one are called Perks, who resembles Upchuck's design from the original series, and the other are called Murks, who resemble Upchuck's design from Alien Force and Ultimate Alien. They have identical abilities, and in "Tummy Trouble", Upchuck displays the ability to switch between the two races. Derrick J. Wyatt stated that he did this because he likes both designs of Upchuck, and wanted to be able to use both.
• Retcon: His inability to eat human food was dropped by Omniverse due to how it was seen as an unnecessary handicap by Man of Action. He had been shown drinking a Mr. Smoothie in Alien Force, but there the writer was pulling a Loophole Abuse by claiming that their product is actually a Nutritional Nightmare (plus the fact that said Mr. Smoothie was a giant cardboard cutout brought to life by Charmcaster).
• This Billboard Needs Some Salt: At one point in Alien Force, he drinks an animated "Mr. Smoothie". In the original series, this is quoted as Ben exclaims that Upchuck is a bottomless pit, but just can't eat regular food.

Upgrade

Upgrade (OS-04, RE-04)

Voiced by Tara Strong (Original Series, Omniverse (11 year old), Yuri Lowenthal (Ben 10/Generator Rex: Heroes United, Omniverse (16 year old)), David Sobolov (Reboot)

Upgrade's DNA was sampled from a Galvanic Mechamorph, a bio-mechanical race. Galvanic Mechamorphs were an accidental creation of the Galvan resulting from an experiment on their moon Galvan B when they attempt to turn the moon into a planet-sized space station through nanotechnology and a device called the Helix. The experiment was successful but ended up creating artificial life forms, resulting in the Galvanic Mechamorphs. The Galvan eventually gave up the experiment and helped the newborn Galvanic Mecamorph to create their own civilization before recognizing them as an independent species.

Ben 23's version is named Techno-Bubble.

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• Ascended Extra: Zig-zagged in the reboot: in Season 1 he has basically the same role as in the original series; in Season 2 he doesn't appear until the Season finale (his absence has been noted several times, however) where it's revealed his DNA had been destroyed and forced to fuse with Ben's DNA and became the Genius Loci of the Omnitrix, taking the name "Glitch". In Season 3 he escaped the Omnitrix, joining the protagonists as the Sixth Ranger.
• Blob Monster: Of the "liquid metal" variety, much like the T-1000.
• Character Catchphrase: Ben likes to say "How about an Upgrade?" when using him.
• Confusion Fu: Upgrade's powers and unique physiology make him an unpredictable foe, as every machine he possesses has different abilities.
• Cyber Cyclops: Has a single eye on the end of his head. The older Ben's version, in Omniverse, puts the Omnitrix symbol on top of it (11-year-old Ben's Upgrade has a slightly modified version of his design from the Original Series).
• Cyber Green: He and most other Galvanic Mechamorphs have a largely green and black color scheme to coincide with their tech-based powers.
• A Day in the Limelight: A fairly minor one, but "Game Over" revolves around Ben and Gwen trapped in a video game, their quest being to find Upgrade's icon so they can get out, and the villain also attempting to retrieve Upgrade so he can use his form to escape.
• Energy Weapon: He can form energy constructs such as spikes on the machines he possesses.
• Expressive Mask: Well, "eye". It's the only way to tell if Ben's angry or glaring.
• Eye Beam: Though it took Ben time to figure out, Upgrade can shoot a plasma beam from his single eye, even when not fusing with machines. This ability is absent in Omniverse, due to the Omnitrix symbol now being where his eye usually is.
• Fusion Dance:
  • Ben uses him to do this with Rex in Heroes United, making his already powerful constructs even more powerful.
  • In "It's a Mad, Mad, Mad... Ben World", Ben 23 uses his own version of Upgrade, Techno-Bubble, to do the same with mainstream Ben's Clockwork.
• Mechanical Lifeform: He is made of very advanced Galvan nanotechnology.
• Purple Is Powerful: The reboot changed his colors from black, green, and white to two different shade of purple.
• Robo Speak: Averted. Unlike the other aliens on the Omnitrix, Ben (and Max in the Original Series episode "Gwen 10") retains his human voice in this form, albeit with a static filter applied to it. A pop-up in the original series explains that, due to Galvanic Mechamorphs being unable to "upgrade" living tissue, the merge with Ben's DNA is incomplete.
• Rubber Man: Can stretch his limbs and body at will, being a liquid metal.
• Shapeshifting: He can reshape his body, stretching out to act as a parachute while falling, or projecting spikes to attack opponents.
• Science Hero: A variation. While Upgrade doesn't technically make Ben any smarter, the main appeal Upgrade seems to be brains over brawns, as he can merge with technology and use it to fight for him. Unlike Grey Matter, Upgrade can hold his own in a fight for the most part; he's just never Ben's first choice to go into physical combat with.
• Technopath: He can take over any machine by fusing with it, upgrading it (hence his name) to incredible levels in the process. But it has limits; if the machine is sentient, it can struggle with the possession and get free.
• Terminator Impersonator: He is seemingly based on the T-1000 liquid metal terminator.
• Took a Level in Badass: In the original series his upgrades were limited by the machinery he possessed. Sure, true to his name he could upgrade things to include weaponry even if they shouldn't, but if he possessed a piece of exercise equipment he was not going to be moving anywhere. In Omniverse, when he possesses Kevin's car he gives it the ability to fly and turn into a Humongous Mecha.
• Tron Lines: Galvanic Mechamorphs as a species have these, and they do well to add extra awesomeness to whatever tech they fuse with.

Way Big

Way Big (Secret of the Omnitrix^note Part 3, or technically OS-52 ^note Used by Ben 10,000 in OS-46, RE-167-172)/Ultimate Waybig (UA-52)

^{Click here to see Ultimate Way Big}

Voiced by Fred Tatasciore (Original Series), Dee Bradley Baker (Alien Force, Ultimate Alien), Eric Bauza (Omniverse), Roger Craig Smith (Reboot)

Woah! Check me out! I'm not just big, I'm WAY BIG!

Way Big's DNA was sampled from a To'kustar, a race of enormous aliens created in cosmic storms. Despite their power, they are actually peaceful in nature. He is primarily used by Ben to fight giant foes, due to his size.

Ben 23's version is named Giant-Manster.

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• Achilles' Heel: Destroy All Aliens establishes that To'kustars' head fins are vulnerable to attack. Hit them there and they're paralyzed. It's unclear how long the paralysis lasts since Ben's transformation ended soon after he was hit. This weakness has yet to be shown in any other piece of Ben 10 media.
• Awesome, but Impractical: As his name implies, Way Big is positively massive, and could end most threats just by stepping on them if he wanted to. Of course, the fact that he's so huge means that Ben can only use him in limited situations so that he doesn't destroy everything by accident. Really, Ben only uses him for fighting giant opponents.
• The Big Guy: In terms of physical power, he is by far Ben's strongest alien.
• Blade Below the Shoulder: Though he has yet to use it offensively. They get increasingly exaggerated in his normal form in subsequent installments, but ironically, they are very much downplayed in his Ultimate form.
• Deadly Disc: The Energy Weapon variant.
• Destructive Savior: One of the reasons Ben only uses him sparingly, as Way Big's immense size and strength risks a ton of collateral if he isn't careful. Perhaps the best demonstration of this is in Destroy All Aliens, where a fight between him and another To'kustar levels an entire city.
• Disney Death: He was aged to dust by Eon, but restored by Ben 10,000.
• Evolution Power-Up: Way Big's ultimate form is Ben's largest alien to date, and the most prone to collateral damage not accounting for Ben's nuclear aliens, which is why he only used it once. Though not much changes, Way Big becomes three times bigger and stronger and can shoot his To'kustar Cosmic Rays as discs. The only downside to this form is that the strength of his lasers is not proportionate to his evolution, which negates his need to become bigger if he's not using his size and strength directly.
• Expy: Of Ultraman, right down to the plus-shaped energy beam.
• Eyes Do Not Belong There: In the original series and Omniverse, he has two extra eyes protruding from his cheeks.
• Just a Stupid Accent: In Omniverse, he speaks with an exaggerated Japanese accent. Considering what he's based on, it makes sense.
• Kaiju: By virtue of his massive size and strength, he's the only alien in the original lineup to qualify.
• Kamehame Hadoken: He can fire an extremely powerful energy beam from his hands by putting them into a plus sign, capable of destroying entire planets or overpowering planet-busting attacks. In Omniverse, this changes to an X formation.
• Last Episode, New Character: He's unlocked in Secret Of The Omnitrix, which is chronologically the Series Finale. His only other appearance in the original show was an alternate future episode. Two series later, Ultimate Way Big makes his first and only appearance in the Ultimate Alien finale.
• Lightning Bruiser: Alien Force shows that despite their size, To'kustar are quite fast as well.
• Negative Space Wedgie: According to the official bio, this is the species' birthplace; To'kustar are born in giant cosmic storms.
• Non-Standard Character Design: He's got his design from the sequels in "Destroy All Aliens".
• One-Man Army: Given his size, he can literally crush entire armies at once.
• Our Giants Are Bigger: The biggest species in the galaxy.
• Shout-Out: Way Big is a fusion of various Ultras from the Ultra Series — he has the color scheme of the original Ultraman with the exaggerated head fin of Ultraman Ace backwards. Additionally, his silver skin is composed of a different material than the red parts, paying tribute to one of the original ideas for Ultraman^note That being the silver parts of Ultraman would be his armor, and the red would be more vulnerable. Another is a moving mouth, but that's a very minor detail here. Way Big's Ultimate form has two horns like Ultraman Taro but the color scheme of Ultraman Tiga and Ultraman Dyna, and has access to the Ultra Slash technique, a common Showa Ultra technique. Ultimate Way Big's elbow spikes also serve as an early example, as the only Ultra with the exact same arm fins as Ultimate Way Big is Ultraman Geed Primitive. In addition, the species name, To'kustar, seems to be a reference to the name "Tokusatsu"; the genre that Ultraman belongs to.
• Spin to Deflect Stuff: Ultimate Way Big deflected Dagon's lasers by spinning like a tornado.
• Story-Breaker Power: A lot of enemies would be defeated in a matter of seconds if Ben just used this guy (his first appearance had him easily defeat Vilgax), which might explain why he wasn't introduced until the original series' finale and brought back in the season two finale of Alien Force. After that, the writers were forced to either rely on Ben carrying the Idiot Ball or the Omnitrix's tendencies to give him the wrong alien to ensure Ben wouldn't use him too often. Way Big also can't be used inside buildings or aboard space ships because he's too big to fit inside them.
  • This status of his is discussed in a few episodes, such as the Ultimate Alien episode "The Purge." Ben knows that using Way Big is overkill in normal circumstances, and deliberately chooses a less powerful alien in order to fight with honor.
• Super Mode: Ultimate Way Big, the last Ultimate form introduced in Ultimate Alien.
• Super-Speed: Displayed this ability in Ultimate Alien, where he ran in circles on the ocean so fast that he created a giant tornado of water. In Omniverse, he's still shown to have extraordinarily fast reflexes, being able to react to the Incursean's conquest ray midblast with his own cosmic beam.
• Super-Strength: As if his massive size wasn't enough already, Way Big has great strength even in proportion to it. To put things into perspective: his debut established he can throw a normal-sized Vilgax into space. Alien Force shows he can throw a Way Big-sized Vilgax into space.
  • So much so that in "Ken 10", Ben didn't use him until Kevin harmed his son. Note that this was in the middle of a populated city. Ben was really pissed at Kevin at the time.
• Ultraman Copy: He is colored dominantly in red and white, capable of changing size and even has a crest in the same way as the original Ultraman. In Ultimate Alien, his Ultimate form even performs a "Rise" to further drive the point. And to boot his species is named To'kustar after the genre which Ultraman helped codify and popularize.
• Weaksauce Weakness: Not the form itself, but "Blukic and Driba Go to Mr. Smoothy's" reveals that Ben is allergic to peanuts, and as Way Big, refuses to get anywhere near them, suggesting that the allergy carries over to his alien forms thus giving Way Big the same weakness.
• World's Strongest Man: The strongest alien in the Omnitrix in terms of raw strength, though he is eclipsed by Alien X and Atomix as the most powerful alien of all.
• The Worf Effect: As one of Ben's most powerful forms (his Ultimate form even moreso), he's been subjected to this on several occasions.
  • When Ben first encountered Eon, the latter effortlessly aged Way Big to dust with a time ray.
  • His sole appearance as Ultimate Way Big had him easily defeated by Dagon to show how dangerous the Big Bad was.
  • A more humiliating example occurs in Omniverse, where Trombipulor managed to get the upper hand on him after eating peanuts to grow to a massive size.
  • He was defeated and absorbed by Malware's One-Winged Angel form, who had absorbed so much of Galvan Prime that he even towered over Way Big himself.
• Tornado Move: He used his Super-Speed to make a tornado powerful enough to throw a giant monster into the sun.
• Vocal Evolution: Omniverse gives him a Japanese accent in reference to his inspiration.
• Your Size May Vary: Way Big's size is portrayed very inconsistently throughout the franchise. He's been portrayed anywhere from just a couple of stories tall to taller than a skyscraper, and different official sources have stated him to be anywhere from 60 to 200 feet.

Wildmutt

Wildmutt/Ultimate Wildmutt (OS-01, UA-32)

^{Click here to see Ultimate Wildmutt}

Voiced by Dee Bradley Baker

Wildmutt's DNA was sampled from a Vulpimancer, a race of canine-like creatures from Vulpin. A pitch-black planet at the galaxy's edge, Vulpin has long served as a dumping ground for hazardous materials far too dangerous for other worlds. The little that was once natural here long ago became corrupted by dangerous outside influences. Part penal colony, part toxic waste dump, whatever life that does survive here among the subzero temperatures and the poisoned forests must learn to adapt to the harshest of climates.

Notably, Vulpimancers are also a common species in the Null Void, though the ones from this place tend to have a much more monstrous appearance.

Ben 23's version is named Dog-Nabbit.

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• Adapted Out: He is not present among Ben's original 10 aliens in the reboot, having been replaced with Wildvine.
• Angry Guard Dog: This is essentially what Ben becomes as Wildmutt, especially because he can't talk. Technically, he still has Ben's mind and personality, but it's harder to tell when all he can really do is growl, roar, and attack.
• Beware My Stinger Tail: Ultimate Wildmutt gains a spiked tail.
• Call a Smeerp a "Rabbit": Or in this case a dog. Wildmutt's physical resemblance to a dog is vague at best, being sort of a cross between a dog, ape, tiger, and fox. Because his powerful sense of smell is most commonly associated with dogs, however, that's what he's named after.
• The Cameo: Made a brief appearance in "Viktor: The Spoils", while Ben was unconscious, before making his official reappearance in "Prisoner 775 is Missing".
• Blood Knight: Evolving into Ultimate Wildmutt seems to cause Ben to act more aggressive, though not to Rath levels.
• Disability Superpower: Has no eyes but can "see" with its other senses, such as its three "gill-like" nostrils on each side of its neck. Except when Ben gets a cold, which clogs them up rendering him blind.
• Early-Bird Cameo: Meta example; a toyline first revealed the existence of Ultimate Wildmutt.
• Evolution Power-Up: Wildmutt's Ultimate form is capable of articulating words, unlike his predecessor. Upon evolving, Ultimate Wildmutt grows a tail with a spiked tip and spinal spikes. Due to his evolution as a tracker, Ultimate Wildmutt also has a noticeable bloodlust that affects his personality and makes him more ravenous.
• Expy: Of Taz the Tasmanian Devil, possibly. He's a hairy creature who's unintelligible, speaks in growls and snarls, and has an attack that involves rolling into a ball.
• Eyeless Face: Has no eyes, therefore relying on smell and its other senses.
• Jack of All Stats: Wildmutt has a fairly good balance of strength, durability, speed, and agility compared to the other alien forms, but is not especially proficient with any of them; nevertheless, this is what made it so adaptable.
• Joke Character: When Ben is afflicted with a cold, Wildmutt's "nostrils" are clogged up. Wildmutt thus goes from "powerful Jack of All Stats" to "powerful, yet blind, uncontrollable creature".
• Logical Weakness: His Super-Senses can be overwhelmed through sensory overload, such as a high-pitched noise or a bad smell.
• Smarter Than You Look: Ben retains his human intelligence in this form. Also applies on a species-wide scale, as Vulpimancers are sentient enough to have their DNA accepted into the Omnitrix.
• Suddenly Voiced: In Ultimate Alien, he gains the ability to speak after evolving into Ultimate Wildmutt.
• Super-Senses: Can hear a wide range of sounds and track scents.
• They Have the Scent!: Starting in Ultimate Alien, Ben begins using Wildmutt to sniff out and track enemies that he's looking for, such as Prison 775 when he goes missing.
• The Unintelligible: Wildmutt can't speak, communicating only through growls and roars. Averted with Ultimate Wildmutt, whose speech is understandable.
• The Worf Effect: Was pretty prone to this in the original series — he would often get beaten up to highlight the threat posed by the Villain of the Week.

Wildvine

Wildvine (OS-20, OV-11, RE-09)

Voiced by Jim Ward (Original Series), Dee Bradley Baker (Omniverse), David Hornsby (Reboot)

Wildvine's DNA was sampled from a Florauna, a race of sentient plants from planets Flors Verdance and Xenon. Most Florauna are in colonies, and act with little more than instinct to protect them. Some are much more peaceful in nature, however.

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• Combat Tentacles: He can uses his arms like this.
• Cyclops: He has a single large eye.
• Divergent Character Evolution: Inverted. Omniverse gives him Swampfire's healing factor and vine-spawning seeds.
• Eyes Do Not Belong There: Has an eye on each shoulder in the original series and Ultimate Alien.
• Glass Cannon: His explosive seeds and elongated arms allow him quite a potential for attack, but he is as fragile as any plant. Granted, his Healing Factor makes up for this.
• Green Thumb: He could merge with plant life in the original series and gains the ability to spawn it in Omniverse.
• Healing Factor: Wasn't revealed in the original series (Ben never got in a situation where he was hurt that bad while in this form), but Omniverse did reveal through the character of Pax that Florauna can heal from being reduced to pieces from a blast.
• Immune to Mind Control: Due to being a plant, Sublimino's hypnosis doesn't work on him.
• Informed Flaw: The Bandai profile states that Florauna will quickly wither up and weaken if deprived of water, sunlight, or exposed to the cold; Neither Wildvine nor the various actual Florauna that have shown up in the series have ever displayed such a weakness.
• Overshadowed by Awesome: Swampfire possesses similar plant-based powers, plus a remarkable Healing Factor, some minor Super-Strength and Playing with Fire abilities. Omniverse slightly addresses this by revealing that Florauna also possess a healing factor, as well as emphasizing Wildvine's greater elastic powers.
• Plant Aliens: Based on a Venus flytrap.
• Retcon: A pop-up in the original series that Florauna were savage and unintelligent by nature with Wildvine being an exception due to retaining Ben's personality. This was further demonstrated in Secret of the Omnitrix where the Wildvines that attack Ben and his crew act on pure instinct and nothing more. Omniverse retcons this, or at least makes it exclusive to the Florauna on Xenon by introducing Pax.
• Rubber Man: His vines can elongate to great lengths.
• Swiss-Army Weapon: His seeds can be used as bombs, knockout gas grenades, or grow more vines.
• Tunnel King: Thanks to his roots, he is capable of digging at high speeds and move underground.
• You Don't Look Like You: Like Stinkfly, he was given a more humanoid appearance in the reboot, though in his case this mostly amounted to giving him legs and getting rid of the Venus Fly Trap-like shoulder protrusions.

XLR8

XLR8 (OS-01, RE-02)

Voiced by Jim Ward (Original Series), Yuri Lowenthal (Omniverse), Josh Keaton (Reboot)

XLR8's DNA was sampled from a Kineceleran, an incredibly fast-moving species from planet Kinet. A world of violent electrical storms rapidly orbiting the sun, everything on Kinet is accelerated. Days are compressed into minutes and lifetimes are spread over weeks. Due to the ever-changing nature of their environment, Kinetan society is forever in flux. Although the inhabitants remain constant in their highly charged hyperactive nature, it is said, like lightning, that no returning visitor to this world ever experiences the same place twice.

Ben 23's version is named Speedyquick.

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• Bizarre Alien Locomotion: He moves around by rolling on spheres attached to the bottom of his feet.
• Breakout Character: In the original series, XLR8 was the most popular of Ben's aliens, even winning Cartoon Network's official popularity contest. In season 2 and 3, XLR8 even started to become the most used alien in the show.
• Cool Helmet: It has a retractable visor that protects his eyes while he's moving at high speeds.
• Flanderization: He had a fairly normal personality in the original series and was perfectly capable of moving like a normal person. In Omniverse, XLR8 is downright hyperactive and seems unable to move and talk without being fast. In "Third Time's a Charm", Ben uses him to quickly look through magic books, only to quickly get bored and start reading Sumo Slammers instead.
• Fragile Speedster: He is physically frail and will usually fall after the first punch. Still, he runs so fast you can barely see him most of the time, so punching him even once is in itself an accomplishment.
• Informed Flaw: According to the Bandai profile, his species has a problem running on water due to the static electricity they produce while moving. Yet, XLR8 has been seen moving on water with no such problems.
• Motor Mouth: He tends to speak a lot at a fast pace in Omniverse.
• Rapid-Fire Fisticuffs: He can do this thanks to his super speed, usually in the form of rapid-fire kicks.
• Retcon: A pop-up in the original series episode "Ben 10,000" once stated that XLR8 was the only Kineceleran on Earth due to the slow rotation of the planet compared to their home planet making them sick after a few days. Come Omniverse, Kinecelerans are shown surviving just fine on Earth.
• Running Gag: In the original series, episodes with Cash and JT would always end with XLR8 using his Super-Speed to give them wedgies.
• Space Elves: The Bandai profile describes his species has possessing Pointy Ears and long hair, much like elves. However, since XLR8 wears a helmet and can't remove it (and every Kineceleran introduced since then wears at least a hat if not the whole helmet), this has never been confirmed. On that note, the shape of his helmet is reminiscent of the Eldars, aliens from Warhammer 40,000 who are basically elves in space.
• Stealth Pun: Understanding his name involves saying it fast.
• Speed Demon: XLR8 isn't just fast, but obsessed with doing everything at high speeds. Ben uses him whenever he needs to complete a task very quickly. This seems to apply to Kinecelereans in general which is expected given they are a whole species of speedster aliens. On their planet, days are compressed into minutes, and lifetimes are spread over weeks.
• Spotlight-Stealing Squad: He is one of the most used transformations in Omniverse, having been used a total of 19 times, tied with Feedback and Four Arms.
• Super-Speed: 10 years old XLR8 could run so fast he became invisible to the naked eye. It's unknown exactly how fast the older versions can go, but Ben 10,000's version of the alien was said to be able to regularly patrol the whole planet with little effort.
• Theme Naming: As revealed in Omniverse, Kinecelerans apparently all have gramogram-themed names, such as K8-E (Katie) and N-8 (Nate). Somehow, Ben gave him a Punny Name that still fits with Kineceleran naming structure, even though he didn't even know what a Kineceleran was at the time.
• Time Stands Still: In "The Unnaturals", he moved so fast that time appeared completely frozen to him. He was able to rig a baseball game and prank Cash and JT while appearing invisible to everyone watching.
• Tornado Move: He can use his super-speed to generate small tornadoes for attack purposes, to put out fires, or to catch people who are falling.