History Characters / Ben10OmnitrixAliens

[[/folder]]

!!Original Series Aliens

[[folder:Arctiguana]]
!!Arctiguana/Ultimate Arctiguana (OS-27)
[[quoteright:220:https://static.tvtropes.org/pmwiki/pub/images/Articguana-001_2979.png]]
[[caption-width-right:220:[[labelnote:Click here to see Ultimate Arcticguana as used by Albedo]]https://static.tvtropes.org/pmwiki/pub/images/negative_ultimate_articguana_4.png]][[/labelnote]]
->'''Voiced by:''' Creator/TomKane (Original Series), Creator/EricBauza (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''.
----
* AscendedExtra: He was only seen as one of [[FutureBadass 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''.
* BackpackCannon: Ultimate Arctiguana has two ice cannons on his back.
* BreathWeapon: Ice breath to be accurate.
%%* CuteLittleFangs
* EvolutionPowerUp: 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.
* FacialMarkings: Black stripes across his face.
* AnIcePerson: 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.
* JustAStupidAccent: ''Omniverse'' has him speak in a Jamaican accent.
* OvershadowedByAwesome: 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''.
* ShoutOut: The cannons on his Ultimate form give him a resemblance to [[Franchise/{{Pokemon}} Blastoise]].
* SuperNotDrowningSkills: Arctiguana can breathe underwater.
[[/folder]]

[[folder:Blitzwolfer (Benwolf)]]
!!Blitzwolfer (Benwolf) (OS-31)
[[quoteright:226:https://static.tvtropes.org/pmwiki/pub/images/blitzwolfer_9777.png]]
->'''Voiced by:''' Creator/TaraStrong (Original Series), Creator/KevinMichaelRichardson (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''.
----
* DarkIsNotEvil: 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.
* FlowerMouth: His mouth opens up this way when performing his [[MakeMeWannaShout sonic howl]].
* LightningBruiser: He possesses a decent amount of superhuman strength, plus a quite impressive natural speed.
* LineOfSightName: 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.
* MakeMeWannaShout: His signature ability consist in open his mouth in four mandibles to generate a powerful Sonic Scream.
* {{Metamorphosis}}: Due to (according to [[WordOfGod 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]]
* NobleWolf: When Mr. "It's Hero Time" becomes a wolf, then yes.
* OneShotCharacter: 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.
* OurWerewolvesAreDifferent: 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 [[MakeMeWannaShout Sonic Howl]].
* {{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.
* SpaceJews: In ''Omniverse'', he is renamed after Jewish journalist and news anchor Wolf Blitzer and his accent sounds vaguely Jewish as well.
* SuddenlyVoiced: 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.
[[/folder]]

[[folder:Buzzshock]]
!!Buzzshock (OS-27)
[[quoteright:226:https://static.tvtropes.org/pmwiki/pub/images/buzzshock_ov_9461.png]]
->'''Voiced by:''' Creator/TaraStrong (Original Series, Reboot), Creator/EricBauza (Omniverse)

Buzzshock was sampled from a Nosedeenian, also known as Megawhatts, from the Nosedeen Quasar.
----
* AscendedExtra: Like Arctiguana, he originally only appeared in "Ben 10,000".
* OvershadowedByAwesome: 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. [[labelnote:Note]] Frankenstrike and Brainstorm can create electromagnetic fields. Brainstorm can also 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. Feedback can generate more powerful electrical blasts as well as having EnergyAbsorption beyond electricity [[/labelnote]] The only technique Buzzshock possesses that is unique to him among the electric-based aliens is SelfDuplication but Ben has two other aliens who can use it without needing to absorb electricity or being cut in half.
* ShockAndAwe: Holds the distinction of being the first electrokinetic alien introduced, though not the first one Ben gained the ability to turn into.
* SelfDuplication: Can duplicate if he has enough energy, or if he's cut in half.
* SuddenlyVoiced: Has understandable speech, unlike the other Nosedeenians.
* TheTrickster: Not Buzzshock himself, but Megawhatts as a species are well-known for constantly wreaking havoc due to their love of pranks and mischievous nature.
[[/folder]]

[[folder:Cannonbolt]]
!!Cannonbolt/Ultimate Cannonbolt (OS-15, UA-06, RE-01)
[[quoteright:345:https://static.tvtropes.org/pmwiki/pub/images/cannonbolt_omniverse_poise.PNG]]
[[caption-width-right:345:[[labelnote:Click here to see Ultimate Cannonbolt]]https://static.tvtropes.org/pmwiki/pub/images/ultimate_cannonbolt_4_5617.jpg]][[/labelnote]]

->'''Voiced by:''' Creator/FredTatasciore (Original Series), Creator/DeeBradleyBaker (Alien Force, Ultimate Alien), Creator/DavidKaye (Omniverse), Creator/TravisWillingham (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.\\
\\
Ben 23's version is named ''Rollaway''.
----
* AllThereInTheManual: Ultimate Cannonbolt can supposedly fire his spikes, but this is never shown.
* AttackReflector: On a few occasions Ben has used Cannonbolt's armored body to reflect attacks back at their senders.
* BackForTheFinale: He made his ''Alien Force'' debut in "War of the Worlds".
* BreakoutCharacter: 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=].
* {{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.
* DependingOnTheArtist: How Cannonbolt rolls up and out of his ball form shifts depending on the episode and season.
* EverythingsBetterWithSpinning: Though it's a forward thrust thing, not just in place like a top.
* EvolutionPowerUp: 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.
* HeartIsAnAwesomePower: His sole power is to curl up into a ball and throw himself at the enemy in {{Rolling Attack}}s. 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.
* HyperDestructiveBouncingBall: 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.
* LastOfHisKind: Possibly, seeing how his planet was destroyed by the Great One.
* PromotionToOpeningTitles: In the original series, replacing Ghostfreak.
* RollingAttack: His main thing is rolling around.
* StinkSnub: Both Gwen and Rex have commented that Cannonbolt's musk is nasty, especially if one happens to be wrapped up in his ball form.
* SuperToughness: 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!
* WhatKindOfLamePowerIsHeartAnyway: 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.
[[/folder]]

[[folder:Diamondhead]]
!!'''Diamondhead''' (OS-01, RE-04)
[[quoteright:210:https://static.tvtropes.org/pmwiki/pub/images/Diamondhead-001_8592.png]]
->Voiced by Creator/JimWard (Original Series), Creator/DaranNorris (''Race Against Time''), Creator/DeeBradleyBaker (''Alien Force'', ''Ultimate Alien''), Creator/EricBauza (''Omniverse''), Creator/RogerCraigSmith (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 [[BigBad 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.
----
* AttackReflector: Thanks to his crystalline body, Diamondhead can reflect energy attacks away like a prism.
* BadassBaritone: Regardless of voice actor, Diamondhead always has an awesomely deep voice.
* TheBigGuy: 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 [[StoryBreakerPower Way Big and Feedback]] respectively to accomplish this.
* BladeBelowTheShoulder: Not naturally, but he can shape his hands into ones.
* CrystallineCreature: Petrosapiens are aliens made out of an organic green crystalline material. As Diamondhead, Ben can [[ShapeshifterWeapon manipulate the atomic structure of his physiology at will, allowing him to form his limbs into diamond weapons such as blades and bludgeons]], [[GemstoneAssault fire crystal shards from his body]] and [[ShapingYourAttacks create constructs out of crystals]].
* CrystalPrison: He can encase people and objects in crystal, effectively freezing them. He uses this ability to defeat Malware in their first encounter.
* GemstoneAssault: Shooting crystal shards is his signature ability.
* EnergyAbsorption: In ''Alien Force'', he inherited Chromastone's ability to absorb and channel energy attacks.
* HealingFactor: 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.
* LanternJawOfJustice: He has one in ''Omniverse''. It's not as prominent as Alien X's, but it's still present.
* NighInvulnerability: 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.
* RockMonster: Diamondhead's species is a race of aliens made of thick, organic green crystal material. As Diamonhead, Ben can [[ShapeshifterWeapon manipulate the atomic structure of his physiology at will, allowing him to form his limbs into diamond weapons such as blades and bludgeons]], [[GemstoneAssault fire crystal shards from his body]] and [[ShapingYourAttacks create constructs out of crystals]].
* ShapeshifterWeapon: He has entire control over his physiology, allowing him to shapeshift his arms into blades, project crystal shards, and many other uses.
* StoryBreakerPower: Upon his return in ''[[WesternAnimation/Ben10AlienForce Alien Force]]'' he ended up being the alien who dispatched Vilgax after Vilgax stomped every other alien Ben threw at him including Humungousaur.
* SuspiciouslySimilarSubstitute: To Chromastone in the season three premiere of ''Alien Force'', even gaining his powers as well.
* TookALevelInBadass: While he was already one of Ben's favorites in the original series when he returned in ''[[WesternAnimation/Ben10AlienForce 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.
[[/folder]]

[[folder:Ditto]]
!!'''Ditto''' (OS-41)
[[quoteright:213:https://static.tvtropes.org/pmwiki/pub/images/Ditto-001_3742.jpg]]
->Voiced by Creator/RobPaulsen

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.
----
* AwesomeButImpractical: 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 and they don't have much offensive power otherwise. ''Omniverse'' removes the pain restriction, but they're still fairly weak.
* BadassAdorable: 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.
* CripplingOverspecialization: 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.
* DoppelgangerAttack: He's only effective in combat when he takes advantage of his ability to surround his opponents.
* EnsembleDarkhorse: 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 [[WesternAnimation/{{Animaniacs}} the Warner Brothers]], particularly Yakko Warner. Both are voiced by Creator/RobPaulsen, have vaguely similar appearances, 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.
* JokeCharacter: Not only is his voice and behavior rather silly in general, his WeaksauceWeakness 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.
* LethalJokeCharacter: While physically one of Ben's weakest aliens, he can be effective when used creatively.
* OvershadowedByAwesome: Echo Echo (an alien form introduced in ''Alien Force'') possesses the same power as Ditto without the WeaksauceWeakness and adds a [[MakeMeWannaShout 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 WeaksauceWeakness 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.
* SelfDuplication: His main power. Ditto can duplicate himself without limit.
* TunnelKing: In ''Omniverse'', he quickly digs into the ground like a mole to escape Khyber's Panuncian.
* WeakButSkilled: 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.
* WeaksauceWeakness: 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 OvershadowedByAwesome status to Echo Echo.
[[/folder]]

[[folder:Eon]]
!! '''Eon''' (Race Against Time)
* See [[Characters/Ben10VillainsSpecials Villains section]]
[[/folder]]

[[folder:Eye Guy]]
!!'''Eye Guy''' (OS-48)
[[quoteright:207:https://static.tvtropes.org/pmwiki/pub/images/Eye-Guy-001_2042.jpg]]
->Voiced by Creator/DeeBradleyBaker (Original Series), Creator/PaulEiding (''Omniverse'')

Eye Guy's DNA was sampled from an Opticoid, a reptilian race with 17 eyes across their body. [[EyesDoNotBelongThere Though none are on their face]].
----
* AnIcePerson: He can fire ice lasers from some of his eyes.
* ButtMonkey: ''Omniverse'' frequently puts him in places where his multiple eyes do more harm than good (such as [[EyeScream getting drenched in an eye irritant alien's saliva]]).
* ChestBlaster: His strongest beam comes from a giant eye in his torso. He usually has to close the others to fire it.
* ComboPlatterPowers: 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.
* CreepyGood: 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.
* EarlyBirdCameo: 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".
* EnergyWeapon: Most of his eyes shoot simple energy blasts.
* ExactlyWhatItSaysOnTheTin: 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.
* ExtraEyes: Has eyes everywhere, [[{{Irony}} except where they should be]].
* EyelessFace: His face is the only place on his body ''without'' eyes.
* EyesDoNotBelongThere: He has eyes on his chest, on his limbs, on his torso...
* EyeBeams: Every eye can fire a laser beam. Some eyes have a different type of laser.
* PlayingWithFire: One of his eyes can shoot beams of fire.
* PungeonMaster: 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 ''eye''conic ones, and they just get ''cornea and cornea''!
* WallCrawling: He can cling to walls.
[[/folder]]

[[folder:Four Arms]]
!!'''Four Arms''' (OS-02, RE-02)
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/four_arms_os_render.png]]
->Voiced by Creator/RichardMcGonagle (Original Series), Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/JohnDiMaggio (''Omniverse'' and Reboot)

Four Arms' DNA was sampled from a Tetramand, powerful 12-foot tall aliens with [[ExactlyWhatItSaysOnTheTin 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''.
----
* TheBigGuy: The biggest of Ben's aliens for most of the original series, and the one used primarily for tasks requiring strength.
* DestructiveSavior: He's got super strength, but he's a bit clumsy from time to time.
* InASingleBound: His SuperStrength allows him to jump several stories high with little effort.
* LeeroyJenkins: 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.
* LightIsNotGood: Kevin 11 as Four Arms had paler skin, compared to Ben as Four Arms.
* LightningBruiser: While not the fastest of aliens, he's still speedy, super-strong, and has the ability to jump over skyscrapers.
* ManlyFacialHair: He's the muscular bruiser of Ben's team. He ditches the long hair for a carnival strongman-esque moustache in ''Omniverse''.
* MultiArmedAndDangerous: As his name implies, he's got four arms, and he's one of Ben's strongest aliens in terms of sheer brute force.
* PunnyName: Forearms = Four Arms = 4 arms
* RedIsHeroic: He has red skin, and is one of Ben's most used and iconic aliens.
* UnstoppableRage: 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).
* ShockwaveClap: By slapping all four hands together he can generate a sonic shockwave.
* SuperStrength: 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.
* SpotlightStealingSquad: 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.
* VocalEvolution: 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.
[[/folder]]

[[folder:Frankenstrike (Benvicktor)]]
!!'''Frankenstrike (Benvicktor)''' (OS-38)
[[quoteright:211:https://static.tvtropes.org/pmwiki/pub/images/Benvicktor-001_9846.jpg]]
->Voiced by Creator/MichaelDorn (Original Series), Creator/DavidKaye (''Omniverse'')

Frankenstrike's DNA was sampled from a Transylian, a race of large humanoids who augment themselves with powerful technology from Anur Transyl. They have the [[ShoutOut 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''.
----
* EightiesHair: Sports a mullet in the original series and ''Ultimate Alien''.
* AscendedExtra: He only made one appearance in the original series, but returned and is featured in more than one episode in ''Omniverse''.
* BatmanCanBreatheInSpace: Frankenstrike can survive in the vacuum of space, which allows him to battle Zs'Skayr in his debut.
* CreepyGood: 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.
* DarkIsNotEvil: Ben doesn't become any less heroic while using this guy.
* FleshGolem: His ''Omniverse'' design looks like his body is stitched together, with the body parts being different colors.
* FrankensteinsMonster: He is based on one, though outside of appearance they don't have much in common.
* GeniusBruiser: It was vaguely implied in his debut (and confirmed by pop-up trivia) that Transylians possess some amount of SuperIntelligence (though not as high as Grey Matter). This gets {{retcon}}ned in ''Omniverse''.
* InASingleBound: 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.
* MightyGlacier: Dr. Viktor displayed enough SuperReflexes to react to and backhand [[FragileSpeedster [=XLR8=]]], but his species is otherwise this. As Ben claims, "Frankenstrike isn't a running guy. He's a pounding guy!"
* NoNameGiven: 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''.
* ProgressivelyPrettier: Inverted. [[http://images2.wikia.nocookie.net/__cb20130611221016/ben10/images/2/2e/Frankenstrike_Profile.jpg 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.
* RubberForeheadAliens: Because he's heavily based on FrankensteinsMonster, a reanimated human corpse, he's the second most human-like alien Ben has transformed into (behind [[HumanAliens 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.
* ShockAndAwe: Ben's very first electrokinetic alien. He distinguishes himself from the others through being a MightyGlacier.
* ShoutOut: To Creator/MaryShelley'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.
* SuperReflexes: Dr. Vicktor was able to backhand a speeding [=XLR8=] (and he wasn't even aware of Ben's presence before that).
* SuperStrength: 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.
* TheDogBitesBack: [[AllThereInTheManual 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.
[[/folder]]

[[folder:Ghostfreak]]
!!'''Ghostfreak''' (OS-04)
[[quoteright:230:https://static.tvtropes.org/pmwiki/pub/images/ghostfreak_os.png]]
->Voiced by Creator/SteveBlum (Original Series, ''Omniverse''), Creator/JeffBennett (''Alien Force'', ''Ultimate Alien'')

Ghostfreak's DNA was sampled from an Ectonurite, a race of incorporeal [[OurGhostsAreDifferent ghost-like]] aliens from Anur Phaetos. 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.
----
* AdaptedOut: He is not present among Ben's original 10 aliens in the reboot, having been replaced with Cannonbolt.
* ADayInTheLimelight: "Ghostfreaked Out" revolves around him breaking free from the Omnitrix.
* AndIMustScream: 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.
* BadassBoast: 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.
* ChainedByFashion: [[https://static.tvtropes.org/pmwiki/pub/images/ghostfreak_ov_2894.png He has these as part of his design in ''Omniverse'']].
* CombatTentacles: ''Omniverse'' shows that that the tentacles under his second skin are strong enough to lift a bus full of people.
* ConfusionFu: It's hard to figure out where he going to come at you from if he makes effective use of his invisibility.
* CreepyGood: Ben can get ''very'' creepy when he turns into Ghostfreak, but he remains a good guy... [[EnemyWithout as long as Zs'Skayr doesn't take over.]]
* {{Cyclops}}: he has a single eye, which can move on every part of his body.
* DangerousForbiddenTechnique: 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.
* DarkIsNotEvil: 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.
* TheDreaded: Both Ben and Kevin were wary of assuming this form even before they found out why.
* EyesDoNotBelongThere: 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.
* GrandTheftMe: Heroic example. He 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.
* HorrifyingTheHorror: Ben managed to scare the crap out of ''[[MonsterClown Zombozo]]'' just by using this form.
* IntangibleMan: He wouldn't be called ''Ghost''freak if he didn't have these powers. Though there are chemicals that can neutralize this ability.
* InformedAbility: The Bandai profile mentions Ectonurites possess some amount of psychic powers. Ben was never seen using those abilities as Ghostfreak. [[EnemyWithout Zs'Skayr]] is eventually shown using those abilities, but only in his [[SuperpoweredEvilSide true form]], which Ben never used.
* MookHorrorShow: Famous for delivering one of the greatest examples of this trope in the entire franchise to Zombozo.
* OurGhostsAreDifferent:
** They are a species of aliens from a mysterious sector called Anur Phaetos, are connected through a HiveMind that can manifest through even the slightest sample of their DNA, and are WeakenedByTheLight. 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 LifeDrain abilities. WordOfGod has stated that Ectonurites are alive; however, their concept of "life" is very different from other sapient life forms.
* RedEyesTakeWarning: In the opening of the first two seasons of the original series, Ghostfreak's eye is red as opposed to purple.
* StoryBreakerPower: 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).
* SuperPoweredEvilSide: Zs'Skayr started out as this before his EnemyWithout. 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.
* TookALevelInBadass: 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 LifeDrain and aware of how to use his possession abilities and his tentacles can launch out and are strong enough to hold a bus.
* VocalEvolution: 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.
* WeakenedByTheLight: Though Ghostfreak wears a second skin that protects him from such a weakness. However, he is still vulnerable to fire.
[[/folder]]

[[folder:Grey Matter]]
!!'''Grey Matter/Ultimate Grey Matter''' (OS-02, RE-03)
[[quoteright:150:https://static.tvtropes.org/pmwiki/pub/images/grey_matter_profile.png]]

[[caption-width-right:150:[[labelnote:Click here to see Ultimate Grey Matter as used by Albedo]]https://static.tvtropes.org/pmwiki/pub/images/230px-ultimate_albedo_hd_7067.png[[/labelnote]]]]
->Voiced by Creator/RichardStevenHorvitz (Original Series), Creator/CarlosAlazraqui (''Race Against Time''), Creator/EricBauza (''Omniverse''), Creator/ToddHaberkorn (Reboot)

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''.
----
* AdaptationalBadass: In the reboot. He isn't any stronger physically, but he has AwesomenessByAnalysis like Brainstorm.
** And then there is the [[SuperMode Omni-Enhanced form]]...
* ADayInTheLimelight: 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.
* AuthorAppeal: 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 ComicBook/{{MODOK}} {{Expy}}, so naturally this is in play.
* DrBrainpart: "Grey Matter" is the main component of several organs of the central nervous system, including the brain.
* EyeBeams: Ultimate Grey Matter can fire beams from his third eye which have the effect of negating Ben's transformations.
* GadgeteerGenius: Even at 10 years old, Grey Matter possesses enough intelligence to work advanced machines and build highly advanced weapons.
* HeartIsAnAwesomePower: 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 ''[[GadgeteerGenius build a solar gun out of scraps]]''. An even more extreme example in “Ken 10”, where [[spoiler:Ken uses him to unlock the Master Code of his Omnitrix.]]
* ImprobablyHighIQ: "The Vengers" shows Brainstorm's IQ to be ''10^30''. If Galvans are truly smarter than Cerebrocrustaceans, then this trope must be in effect.
* IncredibleShrinkingMan: Ben goes from whatever size he normally is, to about 6 inches tall. [[invoked]]
* InformedAbility: 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 SuperIntelligence 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 SuperIntelligence has so far mostly applied to technology. He has had a few AwesomenessByAnalysis moments scattered here and there, though, such as defeating Tyrannopede by copying Khyber's Hephaestan neural grip technique.
* JokeCharacter: A RunningGag in the original series was Ben's tendency to mistransform into Grey Matter, usually in situations where his small size makes him very impractical.
* {{Leitmotif}}: A silly, fast-paced theme would often play for his scenes in the original series to reflect his mostly comical status.
* LethalJokeCharacter: Compared to most of Ben's other aliens, his powers seem pretty laughable and useless in a fight, but if well-used, he can become extremely useful and deadly. Not to mention his species is considered the closest thing the ''Ben 10'' Universe has to a dominant species in the Galaxy.
* MiniMecha: His Omni-Enhanced form in the reboot puts him in one, adding (as he puts it) some brawns to his brains.
* MyBrainIsBig: Ultimate Grey Matter, while being roughly the same size as the normal form, is mostly brain.
* OvershadowedByAwesome: 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 (though generally suggested to be less so than Grey Matter) and combines it with ShockAndAwe and MindOverMatter. 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.
* ShorterMeansSmarter: The smallest alien until the introduction of Nanomech, and the smartest alien Ben has.
* ShoutOut: Ultimate Grey Matter's form looks quite similar to ComicBook/{{MODOK}}
* TheSmartGuy: 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.
* SuperIntelligence: 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.
* WallCrawl: The mucus his skin secretes allows him to adhere to surfaces to climb them.
* WhatKindOfLamePowerIsHeartAnyway: When Ben was ten years old, Grey Matter was his least favorite alien because of the low physical ability.
[[/folder]]

[[folder:Heatblast]]
!!'''Heatblast''' (OS-01, RE-01)
[[quoteright:140:https://static.tvtropes.org/pmwiki/pub/images/heatblast_og.png]]
->Voiced by Creator/SteveBlum (Original Series), David Franklin (''Race Against Time''), Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/DavidKaye (''Omniverse''), Creator/DarylSabara (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''.
----
* AnIcePerson: In the 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.
* TheCameo: 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.
* ConvectionSchmonvection: 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 FountainOfYouth. This most likely doubles as HollywoodFire. 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.
* DemotedToExtra: 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 [[/note]]. 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.
* ElementalAbsorption: He can absorb fire.
* ElementalPowers: He has pyrokinesis when healthy, and cryokinesis when infected with a cold.
* ElementalPunch: As shown in his fight with Victor, he can wreath his hands in fire to increase the intensity of his punches.
* FlyingFirepower: Initially not, but in later episodes, Ben learned to use his fire abilities to propel himself in the air and fly.
** UpToEleven in the reboot, where his Omni-Enhanced form has a jet pack.
* LivingLava: His body is composed entirely of plasma and volcanic rocks.
* OneManArmy: Downplayed. In the original series episode "Secrets", he was easily able to one-shot an entire group of Vilgax's drones. In ''WesternAnimation/Ben10UltimateAlien'' he was able to fight on par and defeat another OneManArmy in the form of Victor.
* PlayingWithFire: He can produce fire, absorb it and wreathe parts of his body in it.
* ThePowerOfTheSun: What with Pyronites being born on stars and all.
* RecurringElement: The [[ContinuityNod first alien Ben used was Heatblast]]. Following this, generally, the first alien anyone uses for the first time is Heatblast or comparable.
** 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.
** [[Film/Ben10RaceAgainstTime Both]] [[WesternAnimation/Ben10SecretOfTheOmnitrix 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[[/note]]
** The first alien he transforms into in ''Alien Force'' is Swampfire, an alien combining the general abilities of Heatblast and Wildvine. The first HalfHumanHybrid 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 [[FusionDance composite]] [[MixAndMatchCritters form]] Khyber uses after shacking up with Skurd was Crabdozer as well.
* ShoutOut: When his head goes out, his face looks like ComicBook/IronMan.
* SuperSpeed: In the reboot, his Omni-Enhanced form can fly faster than [=XLR8=] can run, as shown in "High Stress Express".
* SuperToughness: While not Ben's most durable alien, he was still able to get thrown through three buildings while on the receiving end of a CurbStompBattle from [[BigBad Vilgax]] and was no worse for wear.
* SwissArmySuperpower: Besides the standard SuperStrength and SuperToughness, 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.
* WeaksauceWeakness: 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.
[[/folder]]

[[folder:Ripjaws]]
!!'''Ripjaws''' (OS-03)
[[quoteright:211:https://static.tvtropes.org/pmwiki/pub/images/Ripjaws-001_7034.jpg]]
->Voiced by Creator/FredTatasciore (Original Series), Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/EricBauza (''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''.
----
* AbledInTheAdaptation: 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.
* AdaptedOut: He is not present among Ben's original ten aliens in the reboot, having been replaced by Overflow. [[BackForTheFinale He is used by Gwen 10 in the finale episode of the reboot however]].
* AlluringAnglerfish: He's got the angler, but we've never seen it glow.
* ChuckCunninghamSyndrome: 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.
* CreepyGood: Seriously, just look at his face.
* CripplingOverspecialization: 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.
* JokeCharacter: 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.
* LightningBruiser: 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.
* MoreTeethThanTheOsmondFamily: 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''.
* OurMermaidsAreDifferent: He has a unique mermaid-like tail when he's underwater.
* OutOfFocus: 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.
* OvershadowedByAwesome: In the sequels, Ben gets access to many other aquatic aliens that can actually survive on land, making Ripjaws largely obsolete.
* {{Retcon}}: [[AllThereInTheManual 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.
* RunningGag: 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.
* SuperNotDrowningSkills: He's aquatic.
* ThisLooksLikeAJobForAquaman: 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.
* WeaksauceWeakness: 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.
[[/folder]]

[[folder:Snare-oh (Benmummy)]]
!!'''Snare-oh (Benmummy)''' (OS-37)
[[quoteright:226:https://static.tvtropes.org/pmwiki/pub/images/snare-oh_5283.png]]
->Voiced by Richard Green (Original Series), Creator/KevinMichaelRichardson (''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. Anur Khufos is a planet rich in Corrodium, a substance known for being extremely radio-active and causing horrible mutations. As such, Thep Khufan had to adapt to this to survive.
----
* AscendedExtra: He only made two brief appearances in the original series. He's used more often in ''Omniverse''.
* CombatTentacles: 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''.
* ConfusionFu: His CombatTentacles and RubberMan powers naturally give him a very unorthodox attack pattern.
* DarkIsNotEvil: 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.
* ForgotAboutHisPowers: 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.
* HealingFactor: Can easily be torn apart and even ''shredded to bits'', and reform nearly instantly.
* HowDoIShotWeb: 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.
* LosingYourHead: "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.
* MummyWrap: His primary power; all these bandages actually are tentacles he can use to grab anything and anyone.
* NoNameGiven: 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".
* NoSell: 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.
* OneShotCharacter: He only appeared in one episode of the original series, although he did make a brief appearance as a ContinuityNod 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.
* RubberMan: He can shapeshift his bandages to either fit through tight spots or be used as a makeshift cushion.
* ShoutOut: In ''Omniverse'', his voice is based on Creator/BorisKarloff.
* SuddenlyVoiced: Ben can speak as Snare-oh, despite the fact that the alien he got the DNA sample from is TheSpeechless.
* ZombieGait: Averted -- he's actually one of the more nimble aliens Ben can use.
[[/folder]]

[[folder:Spitter]]
!!'''Spitter''' (OS-27)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/spitteros.png]]
->Voiced by Creator/DeeBradleyBaker (Original Series)

Spitter's DNA was sampled from a Spheroid from planet Scalpasc.
----
* AscendedExtra: 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.
* TheCameo: He tends to make very brief appearances.
* ChuckCunninghamSyndrome: 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.
* InflatingBodyGag: He inflates whenever he spits.
* SuperSpit: He can spit a powerful blast of slime.
[[/folder]]

[[folder:Stinkfly]]
!!'''Stinkfly''' (OS-02, RE-06)
[[quoteright:236:https://static.tvtropes.org/pmwiki/pub/images/Stinkfly-001_1036.png]]
->Voiced by Creator/DeeBradleyBaker (Original Series, ''Ultimate Alien'', ''Omniverse''), Creator/GregCipes (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''.
----
* BewareMyStingerTail: He has a bee/scorpion-like stinger that is sharp enough to rip through metal.
* BigCreepyCrawlies: Basically a giant alien fly.
* BreathWeapon: Shoots slime from his mouth and eyes. He can alter the properties of this goo, making them either flammable or fire retardant, for example.
* EnergyWeapon: When a time-traveling 10-year-old Ben used him in ''Ultimate Alien'', his eyes shot lasers instead of goo.
* EyeOnAStalk: 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.
* OvershadowedByAwesome: 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, more durability, better ground-based combat, etc.). Even in Omniverse where his main competition, Jetray, was absent he appeared rather infrequently, especially for one of the original aliens.
* StinkSnub: Stated several times by other characters that Stinkfly, well... ''stinks''.
* SuperDeformed: 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.
* TokenFlyer: 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.
* WeaksauceWeakness: Stinkfly's wings are very vulnerable. Even to water.
* YouDontLookLikeYou: 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 of firing it out of holes in his shoulders. This happened due to his original design being considered "too scary" and being hard to animate.
[[/folder]]

[[folder:Upchuck]]
!!'''Upchuck''' (OS-39)
[[quoteright:199:https://static.tvtropes.org/pmwiki/pub/images/upchuck_oficial.png]]
->Voiced by Creator/DaveWittenberg (Original Series), Creator/DeeBradleyBaker (''Alien Force'', ''Ultimate Alien''), Creator/EricBauza (''Omniverse'')

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''.
----
* AdaptedOut: 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.
* BewareTheSillyOnes: 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!
* BigEater: Except he can't digest what is normally considered "food", leading to some rather bizarre culinary choices on his part.
* ThisBillboardNeedsSomeSalt: At one point, 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.
* BreathWeapon: 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.
* CounterAttack: Upchuck's abilities are often used in this matter, being able to swallow enemy attacks and fire them right back.
* EatingTheEnemy: Upchuck can devour practically anything, which includes enemies. Of course, if they're alive he usually spits them back out.
* ExtremeOmnivore: He can eat ''everything''... except, ironically, regular food. And by everything, an episode on ''Omniverse'' shows that the species as a whole has Plan Omega, which is to eat ''their entire planet!''
* GlassCannon: A given since he's the size of a woodchuck.
* MeaningfulName: Wanna know why Upchuck's species comes from Peptos '''XI'''? [[spoiler: Because of the species enacting Plan Omega -- which is to ''devour their entire planet'' -- which they've done 10 other times in the past!]]
* MultipurposeTongue[=/=]OverlyLongTongue: Upchuck has four very strong, extendable tongues, which he can use to lift absurdly heavy objects or trip foes.
* PaletteSwap: 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", [[https://www.youtube.com/watch?feature=player_embedded&v=2sxZSI6EHX4 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.
[[/folder]]

[[folder:Upgrade]]
!!'''Upgrade''' (OS-04, RE-04)
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/upgrade_ov_11.png]]
->Voiced by Creator/TaraStrong (Original Series, ''Omniverse'' (11 year old), Creator/YuriLowenthal (''WesternAnimation/Ben10GeneratorRexHeroesUnited'', ''Omniverse'' (16 year old))

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''.
----
* ADayInTheLimelight: 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.
* AscendedExtra: Zig-zagged in the ''[[WesternAnimation/Ben102016 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 [[spoiler:his DNA had been destroyed and forced to fuse with [[HalfHumanHybrid Ben's DNA]] and became the GeniusLoci of the Omnitrix, taking the name "Glitch".]] In Season 3 he [[spoiler:escaped the Omnitrix, joining the protagonists as the SixthRanger.]]
* BlobMonster: Of the "liquid metal" variety, much like [[Film/Terminator2JudgmentDay the T-1000]].
* CatchPhrase: Ben likes to say "How about an Upgrade?" when using him.
* ConfusionFu: Upgrade's powers and unique physiology make him an unpredictable foe, as every machine he possesses has different abilities.
* CyberCyclops: Has a single eye on the end of his head. ''Omniverse'' puts the Omnitrix symbol on top of it (for the 16-year-old Ben's Upgrade. 11-year-old Ben's Upgrade has a slightly modified version of his design from the Original Series).
* {{Expy}}: He is seemingly based on the [[Film/Terminator2JudgmentDay T-1000 liquid metal terminator]].
* ExpressiveMask: Well, "eye". It's the only way to tell if Ben's angry or glaring.
* EyeBeam: Though it took Ben time to figure out, Upgrade can, even when not fusing with machines, shoot a plasma beam from his single eye. This ability is absent in ''Omniverse'', due to the Omnitrix symbol now being where his eye usually is.
* FusionDance:
** Ben uses him to do this with [[WesternAnimation/GeneratorRex Rex]] in ''[[WesternAnimation/Ben10GeneratorRexHeroesUnited 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.
* MechanicalLifeform: He is made of very advanced Galvan nanotechnology.
* PurpleIsPowerful: The reboot changed his colors from black, green, and white to two different shade of purple.
* RoboSpeak: Averted, Ben (And Max in the Original Series episode "Gwen 10") retains his human voice in this form, albeit with some static noises in the background. [[https://static.wikia.nocookie.net/ben10/images/2/2c/Upgrade_Incomplete.png/ 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.
* RubberMan: 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.
* ScienceHero: 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.
* TookALevelInBadass: In the original series his upgrades were limited by the machinery he possessed. Sure, he could get things to shoot lasers that had no business shooting lasers, 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 HumongousMecha.
* TronLines: Galvanic Mechamorphs as a species have these, and they do well to add extra [[RuleOfCool awesomeness]] to whatever tech they fuse with.
[[/folder]]

[[folder:Way Big]]
!!'''Way Big''' (Secret of the Omnitrix[[note]]Part 3, or technically OS-52[[/note]] [[note]]Used by Ben 10,000 in OS-46[[/note]], RE-167-172)/Ultimate Waybig (UA-52)
[[quoteright:230:https://static.tvtropes.org/pmwiki/pub/images/way_big_render.png]]
[[caption-width-right:320:[[labelnote:Click here to see Ultimate Way Big]]https://static.tvtropes.org/pmwiki/pub/images/ultimate_way_big_005_5202.png[[/labelnote]]]]
->Voiced by Creator/FredTatasciore (Original Series), Creator/DeeBradleyBaker (''Alien Force'', ''Ultimate Alien''), Creator/EricBauza (''Omniverse''), Creator/RogerCraigSmith (''Reboot'')

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 [[GentleGiant peaceful in nature]].\\\

Ben 23's version is named ''Giant-Manster''.
----
* AchillesHeel: ''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.
* TheBigGuy: In terms of physical power, he is by far Ben’s strongest alien.
* BladeBelowTheShoulder: 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.
* DeadlyDisc: The EnergyWeapon variant.
* DestructiveSaviour: 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.
* DisneyDeath: He was aged to dust by Eon, but restored by Ben 10,000.
* EvolutionPowerUp: 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 Series/{{Ultraman}}. Right down to the + style energy beam.
* EyesDoNotBelongThere: In the original series and ''Omniverse'', he has two extra eyes protruding from his cheeks.
%%* FourFingeredHands:
* JustAStupidAccent: In ''Omniverse'', he speaks with an exaggerated Japanese accent. Considering [[Series/{{Ultraman}} what he's based on]], it makes sense.
* KamehameHadoken: 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.
* LightningBruiser: His size might make him look like a MightyGlacier, but it's later revealed he's quite fast as well.
* NegativeSpaceWedgie: According to the official bio, this is the species' ''birthplace''; To'kustar are born in giant cosmic storms.
* OneManArmy: Given his size, he can literally crush entire armies at once.
* OurGiantsAreBigger: The biggest species in the galaxy.
* ShoutOut: Way Big is a fusion of various Ultras from the Franchise/UltraSeries: he has the color scheme of the original Series/{{Ultraman}} with the exaggerated head fin of Series/UltramanAce backwards. Additionally, his silver skin is composed of a different material than the red parts, paying tribute to [[WhatCouldHaveBeen 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[[/note]]. Way Big's Ultimate form has two horns like Series/UltramanTaro but the color scheme of Series/UltramanTiga and Series/UltramanDyna, and has access to the Ultra Slash technique, a common Showa Ultra technique. Ultimate Way Big's elbow spikes also serve as [[HilariousInHindsight an early example]], as the only Ultra with the exact same arm fins as Ultimate Way Big is Series/UltramanGeed Primitive. In addition, the species name, To'kustar, seems to be a reference to the name "{{Tokusatsu}}"; the genre that Ultraman belongs to.
* SpinToDeflectStuff: In ''Ultimate Alien'', he deflected lasers by spinning like a tornado.
* StoryBreakerPower: 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 ''[[TheJuggernaut 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 IdiotBall 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.
* SuperSpeed: 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.
* SuperStrength: As if his massive size wasn't enough already, Way Big has great strength [[UpToEleven 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 pushed his BerserkButton and harmed his son. Note that this was in the middle of a populated city. Ben was ''really'' pissed at Kevin at the time.
* UltramanCopy: 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 ''[[WesternAnimation/Ben10UltimateAlien Ultimate Alien]]'', his Ultimate form even performs a "Rise" to further drive the point. And to boot his species is named [[{{Toku}} Tokustar]] after the genre which Ultraman helped codify and popularize.
* WorldsStrongestMan: 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.
* TheWorfEffect: 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.
** As Ultimate Way Big, he was easily defeated by [[EldritchAbomination Dagon]] to show how dangerous the thing 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 OneWingedAngel form, who had absorbed so much of Galvan Prime that he even towered over Way Big himself.
* TornadoMove: He used his SuperSpeed to make a tornado powerful enough to throw a giant monster into the sun.
* VocalEvolution: ''Omniverse'' gives him a Japanese accent in reference to his inspiration.
* YourSizeMayVary: 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.
[[/folder]]

[[folder:Wildmutt]]
!!'''Wildmutt/Ultimate Wildmutt''' (OS-01, UA-32)
->Voiced by Creator/DeeBradleyBaker
[[quoteright:223:https://static.tvtropes.org/pmwiki/pub/images/Wildmutt-001_1315.jpg]]
[[caption-width-right:320:[[labelnote:Click here to see Ultimate Wildmutt]]https://static.tvtropes.org/pmwiki/pub/images/ultimate_wildmutt12365_6328.png[[/labelnote]]]]

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 [[PhantomZone Null Void]], though the ones from this place tend to have a much more monstrous appearance.\\\

Ben 23's version is named ''Dog-Nabbit''.
----
* AdaptedOut: He is not present among Ben's original 10 aliens in the reboot, having been replaced with Wildvine.
* AngryGuardDog: 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.
* BewareMyStingerTail: Ultimate Wildmutt gains a spiked tail.
* CallASmeerpARabbit: 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.
* TheCameo: Made a brief appearance in "Viktor: The Spoils", while Ben was unconscious, before making his official reappearance in "Prisoner 775 is Missing".
* BloodKnight: Evolving into Ultimate Wildmutt seems to cause Ben to act more aggressive, though not to Rath levels.
* DisabilitySuperpower: Has no eyes but can "see" with its other senses. Except when Ben gets a cold, therefore clogging up his sinuses and rendering him blind.
* EarlyBirdCameo: Meta example; a toyline first revealed the existence of Ultimate Wildmutt.
* EvolutionPowerUp: 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 [[WesternAnimation/LooneyTunes Taz the Tasmanian Devil]], possibly. He's a hairy creature who's unintelligible, speaks in growls and snarls, has an attack that involves rolling into a ball.
* EyelessFace: Has no eyes, therefore relying on smell.
* JackOfAllStats: 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.
* SmarterThanYouLook: 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.
* SuddenlyVoiced: In ''Ultimate Alien'', he gains the ability to speak after evolving into Ultimate Wildmutt.
* SuperSenses: Can hear a wide range of sounds and track scents.
* TheUnintelligible: Wildmutt can't speak, communicating only through growls and roars. Averted with Ultimate Wildmutt, whose speech is understandable.
* TheWorfEffect: Was pretty prone to this in the original series--he would often get beaten up to highlight the threat posed by the VillainOfTheWeek.
[[/folder]]

[[folder:Wildvine]]
!!'''Wildvine''' (OS-20, OV-11, RE-09)
[[quoteright:227:https://static.tvtropes.org/pmwiki/pub/images/Wildvine-001_4015.png]]
->Voiced by Creator/JimWard (Original Series), Creator/DeeBradleyBaker (''Omniverse''), Creator/DavidHornsby (Reboot)

Wildvine's DNA was sampled from a Florauna, a race of sentient plants from planet Flors Verdance.
----
* CombatTentacles: He can uses his arms like this.
* {{Cyclops}}: He has a single large eye.
* DivergentCharacterEvolution: Inverted. ''Omniverse'' gives him Swampfire's healing factor and vine-spawning seeds.
* EyesDoNotBelongThere: Has an eye on each shoulder in the original series and ''Ultimate Alien''.
* GlassCannon: His explosive seeds and elongated arms allow him quite a potential for attack, but he is as fragile as any plant. Granted, his HealingFactor makes up for this.
* GreenThumb: He could merge with plant life in the original series and gains the ability to spawn it in ''Omniverse''.
* HealingFactor: 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.
* ImmuneToMindControl: Due to being a plant, Sublimino's hypnosis doesn't work on him.
* InformedFlaw: 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.
* OvershadowedByAwesome: Swampfire possesses similar plant-based powers, plus a remarkable HealingFactor and PlayingWithFire. ''Omniverse'' slightly addresses this by revealing that Florauna also possess a healing factor, as well as emphasizing Wildvine's greater elastic powers.
* PlantAliens: Based on a Venus flytrap.
* {{Retcon}}: A pop-up in the original series that Florauna were savage by nature, and unintelligent, acting on pure instinct, with Wildvine being an exception due to retaining Ben's personality. ''Omniverse'' retcons this, or at least makes it exclusive to the Florauna on Xenon by introducing Pax.
* RubberMan: His vines can elongate to great lengths.
* SwissArmyWeapon: His seeds can be used as bombs, knockout gas grenades, or grow more vines.
* TunnelKing: Thanks to his roots, he is capable of digging at high speeds and move underground.
* YouDontLookLikeYou: 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.
[[/folder]]

[[folder:[=XLR8=]]]
!!'''[=XLR8=]''' (OS-01, RE-02)
[[quoteright:207:https://static.tvtropes.org/pmwiki/pub/images/xlr8-001_9740.jpg]]
->Voiced by Creator/JimWard (Original Series), Creator/YuriLowenthal (''Omniverse''), Creator/JoshKeaton (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''.
----
* BizarreAlienLocomotion: He moves around by rolling on spheres attached to the bottom of his feet.
* BreakoutCharacter: 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.
* CoolHelmet: It has a retractable visor that protects his eyes while he's moving at high speeds.
* EverythingsBetterWithDinosaurs: Looks like an armored velociraptor with wheels as his feet.
* {{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.
* FragileSpeedster: 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.
* InformedFlaw: 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 walking on water with no such problems.
* MotorMouth: He tends to speak a lot at a fast pace in ''Omniverse''.
* RapidFireFisticuffs: 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.
* SpaceElves: The Bandai profile describes his species has possessing PointyEars 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 ''TabletopGame/{{Warhammer 40000}}'' who are basically elves in space.
* StealthPun: Understanding his name involves saying it ''fast''.
* SpeedDemon: [=XLR8=] isn't just [[SuperSpeed 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.
* SpotlightStealingSquad: He is one of the most used transformations in ''Omniverse'', having been used a total of 19 times, tied with Feedback and Four Arms.
* SuperSpeed: 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.
* ThemeNaming: 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 PunnyName that still fits with Kineceleran naming structure, even though he didn't even know what a Kineceleran ''was'' at the time.
* TimeStandsStill: 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.
* TornadoMove: He can use his super-speed to generate small tornadoes for attack purposes, to put out fires, or to catch people who are falling.
[[/folder]]

!!''Alien Force'' Aliens

[[folder:Alien X]]
!!'''Alien X''' (AF-13)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/alien_x.png]]
[[caption-width-right:350:''"Motion Carried!"'']]

->Serena voiced by Vicki Lewis (Alien Force), Creator/TaraStrong (''Ultimate Alien''), Creator/KimberlyBrooks (''Omniverse'')
->Bellicus voiced by Creator/KevinConroy (Alien Force), Creator/JeffBennett (''Ultimate Alien''), Creator/EricBauza (''Omniverse'')

Alien X was sampled from a Celestialsapien, a species of mysterious, god-like aliens with RealityWarping powers. Similar to Ghostfreak, Alien X is sapient of its own accord. It houses two distinct personalities: Serena, the voice of love and compassion, and Bellicus, the voice of anger and aggression. Both of them have near-infinite ability to channel just about any thought into reality, making this arguably Ben's most powerful alien. However, the arguable part is quite literally an issue, as Serena and Bellicus have totally opposite personalities that rarely find the time to actually use these incredible powers because they are obsessed with debating just about every matter there is to discuss and never agree on anything long enough to perform ''any'' sort of action unless someone intervenes or they relent on some level.\\\

This doesn't just apply to them; most Celestialsapiens are crippled by their multiple indecisive personalities, and it is rare to find one that can behave competently without arguing with itself, aside from the infants, which have yet to gain split personalities. Luckily, it's a good thing, because, under the wrong set of circumstances, they might just wipe everything out in the blink of an eye. They reside in a universe far beyond the normal confines of our own and are born from a truly gigantic in comparison Celestialsapien mother.
----
* AdaptationalBadass: This and the opposite trope below. Alien X in the reboot has a lot more control and ease of use, allowing the user to use extensive powers without the hurdles of multiple personalities and debate.
* AdaptationalWimp: This and the opposite trope above. Alien X in the reboot can do a lot of things: teleport, terraform planets, manipulate gravity, fire energy blasts...however Alien X does not have the sheer reality warping he does in the classical continuity. He also can be overpowered in a fist fight by Four-Arms (albeit with support) where the classic continuity could not.
* AllPowerfulBystander: Alien X easily has the power to stop literally any threat Ben could ever face, but because his personalities are near impossible to persuade, Ben is forced to watch helplessly no matter how much chaos is unfolding before him. Bellicus and Serena's BystanderSyndrome is so much so that they treat even the destruction of the entire universe with little more than indifference and mild pity, respectively. Bellicus then treats the restoration of the universe as little more than a small inconvenience.
-->'''Bellicus:''' Fine. But next time the universe and everything in it is destroyed, don't come crying to me!
* AscendedExtra: Given his AwesomeButImpractical status, Alien X only appeared once in ''Alien Force'', where Ben swore not to use him again. In ''Ultimate Alien'', he's limited to only a brief scene, though his species as a whole does get fleshed out more in the same episode. In ''Omniverse'', he appears several times, with each appearance giving Ben greater control of him and playing a significant role in future episodes as well.
* AwesomeButImpractical: Possibly the most extreme example of the trope. Alien X can ''warp reality on a universal scale'', meaning he is technically omnipotent. Unfortunately, because Ben can only control one of the three personalities he can't use any of that power, thus making the alien not only useless but ''dangerous'', since Ben needs Serena's and Bellicus' accord to ''move or turn back to human''. Because of this, he is the only alien where Ben had to develop a fail-safe on the Ultimatrix to ensure he ''wouldn't'' turn into Alien X.
* BerserkButton: Thanks to a NoodleIncident, Paradox is a Berserk Button for the entire Celestialsapien race. Killing him for an apparent violation of their restraining order against him is the one thing Serena and Bellicus will ''immediately'' agree to do.
* CelestialBody: He seems to be a living anthropomorphic ''galaxy''.
* ChekhovsGunman: Because Ben swore to never turn into him again, Alien X didn't play any real role in ''Alien Force'' besides his debut (a joke from an early ''Ultimate Alien'' episode even suggests the episode was {{filler}}). He finally returns in "The Forge of Creation," where it's revealed Aggregor is planning to absorb the powers of his species and become omnipotent.
* DiscardAndDraw: How, ultimately, the reboot incarnation of Alien X comes off compared to his classical counterpart. Alien X does not have the ludicrous limitations that his canon self does, but in turn he doesn't have the same overwhelming power. Of course when it takes six other Omnitrix aliens in tandem fighting (and powerful ones at that like Heatblast, Chromastone, Fourarms, Amphibian, [[MyFriendsAndZoidberg and Ripjaws and Bloxx]]) to take you down the diminished power for much greater control is hardly going to be a typical problem you'd face.
* FreudianTrio: Serena is the [[TheSpock Superego]], Bellicus is the [[TheMcCoy Id]], and Ben is the [[TheKirk Ego]].
* GodzillaThreshold: Because of the severe drawbacks to using him and the risk of the power falling into the wrong hands, Ben only relies on Alien X if and only if there is no option but to resort to him. By the Time War, Ben seems to have finally moved past that when he gets Bellicus and Serena to fall in line.
* InformedFlaw: [[http://ask.fm/DerrickJWyatt/answer/120934106996 Word of God]] is that even after "Universe vs. Tennyson" Ben still has to get control from Serena and Bellicus every time he transforms and they still may limit what Alien X is able to do. However the ''very next episode'' showed Ben using Alien X with much less effort than the previous appearances and is even [[LampshadeHanging lampshaded]] by Rook saying "Ben has control over Alien X".
* LanternJawOfJustice: His chin is very pronounced in ''Omniverse''.
* LikeAnOldMarriedCouple: Bellicus and Serena's relationship fits this to a T, albeit on a cosmic godly level. Their entire dynamic is based around around the fact that they can never agree on anything, but they evidently do care about each other quite a bit -- Bellicus gets angry at Ben in his debut for hurting Serena's feelings, and is clearly embarrassed when she speaks to to him in a sing-song voice.
* TheLoad: Alien X is a reality-bending SuperMode alien, the most powerful being in the universe. The problem is that Ben has to get a majority agreement on the tasks at hand with two other personalities within the alien. But seeing as they can't agree on anything, and are only ''slightly'' more likely to agree with Ben, the form was complete dead weight until Ben had managed to convince Bellicus and Serena that he didn't need to interfere in their debates.
* NewPowersAsThePlotDemands: He gets new powers with each appearance. Justified once being RealityWarper means you can do anything.
* NighInvulnerable: Alien X is impervious to everything it has been hit with, ranging from blaster fire to ''the complete annihilation of the universe'' completely by virtue of deciding whether they'd be harmed. Simply put, if Ben and the other personalities agree that they don't ''want'' to be hurt, they ''won't'' be, with only other Celestialsapiens able to hurt them. However, there's one exception -- they cannot survive on [[DesertedIsland Anur Vladias]], a DarkWorld where ''nothing survives'', not even Celestialsapiens.
* NotSoInvincibleAfterAll: Though Alien X is portrayed as an omnipotent being, there are certain instances where this is simply not the case. For example, he nearly loses to the Galactic Gladiator (though this is entirely justified as [[TakesOneToKillOne the gladiator is a Celestialsapien himself]]). WordOfGod also says that Celestialsapiens can't survive on Anur Vladias.
* OurGiantsAreBigger: Alien X is the size of a normal human; true Celestiansapiens measure in the thousands of feet tall; Kevin was easily able to crash land on one and still had acres of room to spare. However, being reality warpers, their form can easily go either way on a whim.
* ThePowerOfCreation: Used this to [[spoiler: recreate the universe after it's been destroyed]].
* RealityWarper: More [[UpToEleven Reality Maker.]] However, Celestialsapiens have laws that dictate what can be done with their powers and when.
* {{Retcon}}: In ''[[WesternAnimation/Ben10AlienForce Alien Force]]'', Ben functioned as the tiebreaker for Alien X. If he could get either Serena ''or'' Bellicus to agree to anything then it would be decided. In ''Omniverse'' the decision had to be unanimous, with ''both'' Serena and Bellicus agreeing. This is somewhat justified, though, as the last time he got what he wanted done, they got in trouble for it. It makes sense that they'd be a little more cautious, or maybe it's even a punishment from the council that judged them.
* {{Retconjuration}}: It turns out Celestialsapiens can invoke this as a power for reality ''at large'', which is used as a sly HandWave for the many BroadStrokes different teams have chosen to take with their own visions of ''Ben 10''. Celestialsapiens are revealed in "Universe vs Tennyson" to be responsible for all the ArtShift changes and voices of characters changing, as demonstrated with Azmuth's repeatedly altered appearance and voice.
* RunningGag: ''Omniverse'' uses him as one, playing on Rook's [[ArbitrarySkepticism skepticism about his existence]] and Ben insisting that Alien X is real while being unable to prove it for obvious reasons. Eventually, he [[spoiler:actually ''does'' prove it to him when the ''destruction of the universe'' is triggered, forcing Ben to use Alien X. Technically, he failed to save the universe, but, being [[RealityWarper Alien X]], he's able to completely reform it as though nothing had happened. [[TheGreatestStoryNeverTold Ironically, no one other than Ben has any memory of this taking place]] until another Celestialsapien gets onto him for it in "Universe vs Tennyson".]]
* SealedEvilInADuel: Or more accurately "Sealed Neutral in a Debate". Serena and Bellicus do not care about whatever problem Ben is having. [[spoiler: Even the destruction of the universe itself was met with indifference. Ben had to convince them to ''recreate'' the universe because he couldn't convince them to save it in time. Ben later gets them to give him control over Alien X by suggesting that, with him in control, he wouldn't ever need to interfere with their debates.]]
* SealedGoodInACan: Ben had the alien locked in the Ultimatrix so that it can only be activated for emergencies, and so Albedo couldn't access it were he ever to get his hands on a Codon receiver again.
* SelfDuplication: Can duplicate himself, because of his RealityWarper powers.
* SplitPersonality: An example of where this isn't good vs evil, but "war vs peace" or "love vs hate", with it being The Voice of Love and Compassion vs The Voice of Rage. All Celestialsapiens have this but how much they're in control of it varies between species.
* {{Shapeshifting}}: In “Universe vs. Tennyson”, he is able to shapeshift into a galaxy shaped ''thing'' that has enough of a gravitational pull that it sucks in the Galactic Gladiator... who had itself [[SizeShifter grown to the larger than a planet]].
* StoryBreakerPower: If not for the whole AwesomeButImpractical aspect, Ben ''could'' be invincible just by using this form all the time. After Ben gets complete control over the form in "Universe vs Tennyson", the only limit other than random chance is Ben's own imagination. Just to show it off, Ben beat the combined force of the Rooters [[spoiler:and the brainwashed Amalgam kids]] simply by making them shoot each other. However, he ''still'' has to be careful with how he can use his powers or he will get in trouble again.
* {{Telekinesis}}: It's part of Alien X's powers, but never used until he fights the Rooters and makes them fight each other.
* WorldsStrongestMan: Alien X is by far the strongest alien in the Omnitrix, by virtue of being a RealityWarper. Though despite his insurmountable godlike power, he is AwesomeButImpractical.
* XMakesAnythingCool: The X in his name highlights the mysterious nature of his RealityWarper powers. It also doubles as a StealthPun, as X is the Roman numeral for 10.
* VoiceOfTheLegion: When he ''does'' speak, it's Bellicus, Serena, and Ben in unison.
[[/folder]]

[[folder:Big Chill]]
!!'''Big Chill/Ultimate Big Chill''' (AF-04, UA-03)
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/800px-Big_Chill_UA_3_9487.PNG]]
[[caption-width-right:320:[[labelnote:Click here to see Ultimate Big Chill]]https://static.tvtropes.org/pmwiki/pub/images/ultimate_big_chill_by_barrenn-d33sa3d_6344.png[[/labelnote]]]]

->Voiced by Creator/DeeBradleyBaker

Big Chill was sampled from a Necrofriggian from planet Kylmyys. An ice planet full of large glaciers and ravaged by snowstorms, Kylmyys was for a long time thought to be uninhabited, as any life form on it would be instantly frozen. However, Necrofriggians were able to evolve in the deep caves, developing an ability to turn intangible so they could resist extreme climates, as well as ice-based powers. Due to this ability, they were also able to colonize other similarly uninhabitable worlds, such as planet Mykdl'dy.\\\

Necrofriggians are also an asexual species that reproduce every 80 years by laying eggs.\\\

Ben 23's version is named ''Freezeghost''.
----
* ArtEvolution: He goes from his skeletal appearance in ''Alien Force''/''Ultimate Alien'' to huge and bulky in ''Omniverse''.
* BatmanCanBreatheInSpace: Young Necrofriggians live in space and feed on solar plasma.
* BigCreepyCrawlies: He looks like a giant, vaguely humanoid, skeleton-like moth. Even more so in ''WesternAnimation/Ben10Omniverse'', where the skeleton aspect is dropped in favor of making him look more like a bulky bug.
* BizarreAlienSexes: Necrofriggians appear to be a OneGenderRace, as Big Chill laid eggs even though Ben's alien forms are usually male. When asked if Big Chill was a female, Dwayne [=McDuffie=] replied "sort of".
* BreathWeapon: Ice breathing, to be accurate.
* ComboPlatterPowers[=/=]CompositeCharacter: Ghostfreak's intangibility with Arctiguana's ice powers. At one point, Big Chill's subconscious takes over similarly to Ghostfreak, but it wasn't for evil intentions -- [[spoiler:it was to give BIRTH]].
* CreepyGood: Not as much as Ghostfreak, but he still comes up as creepy, with his skull-like face and ghostly voice.
* ElementalRockPaperScissors: Averted. Big Chill can withstand extreme cold ''and'' extreme heat, hailing from a planet that has both. Not even ''drinking molten steel'' is a problem.
* EvolutionPowerUp: Like Cannonbolt, Big Chill's current state is powerful enough to a point where evolution has a minimal effect. When "changing" into Ultimate Big Chill, the only alterations to be had appearance-wise are a palette change and some flame accents. Changes to Ultimate Big Chill's powers simply include taking longer breaths, creating ice out of thin air, and being able to flash-freeze almost anything.
* ExtremeOmnivore: When in MisterSeahorse mode, Big Chill's species chomp down on anything metal and regurgitate it to create a nest for their children. This even gets to the point where Big Chill can digest ''molten steel'' without any ill side effects!
* {{Fauxshadow}}: One episode has him going out of Ben's control, and Gwen believes that he's following in the footsteps of Ghostfreak since they're both ghost-like aliens. But actually, no, Big Chill was just getting ready to be a mommy/daddy/whatever.
* FlyingFirepower: A flyer with powerful ice breath abilities.
* {{Foil}}: To Heatblast. Both are flying elemental aliens yet are not Ben's primary fliers in their respective sets (the role is instead given to Stinkfly in the original series and Jetray in Alien Force). However, Big Chill's main power is his [[AnIcePerson cryokinesis]] while Heatblast is on the complete [[PlayingWithFire other end of the spectrum]]. Heatblast is durable enough to be [[SuperToughness thrown through buildings]] while Big Chill has to rely on his maneuverability and intangibility to [[GlassCannon merely stay in the fight]].
* GhostlyChill: The inspiration for his powers. Naturally, Big Chill himself takes it UpToEleven -- when he passes through someone, he can freeze them solid.
* GlassCannon: His ice powers are extremely powerful and able to defeat much stronger opponents, but his physical structure is relatively weak compared to most of Ben's fight-oriented aliens, making him easy to defeat if you find a way to attack him before he goes intangible (good luck with that, though).
* HarmlessFreezing: As per usual for a kids' action cartoon, Big Chill's ice is like this. All the enemies he freezes eventually thaw out and are perfectly fine in later episodes.
* AnIcePerson: Though he's primarily used for his ice breath, Big Chill has several methods of freezing opponents including shooting ice beams from his hands, through physical contact, and by going intangible. Big Chill also has the ability to freeze the water in the air to create ice constructs and his cryokinesis has successfully overpowered fire attacks more than once.
* IntangibleMan: And can freeze everything he phases through to boot.
* InTheHood: When folded, his wings form like a natural cape and hood, giving him a GrimReaper-esque look.
* LightIsNotGood: Albedo as Big Chill in ''Omniverse'' has a paler color scheme, compared to Ben as Big Chill.
* MamaBear: Pregnant Necrofriggians get ''very'' aggressive when they believe their eggs are threatened.
* MisterSeahorse: Big Chill's species reproduces asexually every 80 years by laying eggs. Ben is no exception, to the point the form's instincts actually ''took over'' his human form to force him to turn into Big Chill regularly and prepare it.
* TheMothman: Explicitly modeled off this alleged cryptid.
* OurGhostsAreDifferent: In this case, this ghost is an ice-breathing alien bug.
* PungeonMaster: Big Chill loves to make ice puns.
* ShoutOut:
** He is based on the [[TheMothman alleged real life cryptid known as "the Mothman"]].
** His ''Omniverse'' design is reminiscent of Batman's outfit from ''WesternAnimation/BatmanTheBraveAndTheBold'', while his overall build takes after Man-Bat.
* TheStoic: He rarely emotes, to the point he only smiled ''twice'' in ''Alien Force''.
* SuperNotDrowningSkills: The ''Ultimate Alien'' episode “Deep” shows him breathing and using his powers just fine underwater.
* SuperStrength: He is capable of easily ripping metal statues and steel girders apart.
* TechnicolorFire: Reversed. Big Chill blows blue ice breath, while [[SuperMode Ultimate Big Chill]] breathes red [[BreathWeapon "ice flames"]] that create an instant [[strike:ice sheet]] ''glaciers''.
[[/folder]]

[[folder:Brainstorm]]
!!'''Brainstorm''' (AF-07)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/brainstorm_uaf.png]]

->Voiced by Creator/DeeBradleyBaker (''Alien Force'', ''Ultimate Alien''), Creator/CoreyBurton (''Omniverse'')

Brainstorm was sampled from a Cerebrocrustacean, a species of sentient, highly intelligent crabs from planet Encephalonus IV. This planet being a place with a lot of energy problems, its inhabitants have developed the ability to produce electrical energy of their own from their very brain. Cerebrocrustaceans are the second smartest species in the galaxy, preceded only by Galvans.
----
* AwesomenessByAnalysis: In "The Vengers", he {{curb|StompBattle}}-stomps the Vengers by predicting their tactics, taking advantage of their weaknesses, and using the environment against them.
* DemotedToExtra: Ben only uses Brainstorm three times in ''Omniverse'', one of which was to be dunked in a dunk tank and the final was a cameo with the rest of his aliens in the finale. He's even absent from "Max's Monster," an episode where Phil had forced the Omnitrix to only transform Ben into electrical aliens -- in fact, Brainstorm is the ''only one'' that doesn't appear there. Apparently, this was due to Brainstorm's low toy sales; instead, Doctor Psychobos, a fellow member of his species, was partially created to make up for this.
* DivergentCharacterEvolution: ''Omniverse'' makes him more of an offensive alien, being able to [[AwesomenessByAnalysis analyze the environments and enemies]], and then use them to his advantage, making him more different from Grey Matter, whose strengths are more in technology and infiltration.
* DrBrainpart: Like Grey Matter, his name references his superior brain. And the fact he can create electric shocks.
* GeniusDitz: Ben's most intelligent alien during ''Alien Force/Ultimate Alien'' and second most intelligent species in the galaxy. That said, Ben often gets distracted and makes foolish decisions while in this form. Averted in ''Omniverse'', however, where he was shown more capable.
* GiantEnemyCrab: Not ''that'' big, seeing how he is around the size of a human, but that's still giant compared to a regular crab.
* HeadBlast: Brainstorm can open up the exoskeleton plates on his skull to fire electric bolts from his brain.
* ImprobablyHighIQ: In "The Vengers", his InnerMonologue displayed his IQ as ''10^30''.
* InsufferableGenius: In ''Alien Force'' and ''Ultimate Alien'', Ben becomes distinctly more arrogant in this form and frequently boasts about his intelligence. This is done away with in ''Omniverse''.
* MightyGlacier: As a crab, he cannot move very quickly, but he compensates by producing powerful electrical attacks and forcefields.
* MyBrainIsBig: It's not hard to see where his genius comes from -- his brain is absolutely ''massive''.
* PowerFloats: He is capable of levitation, though he tends to prefer scuttling along the ground.
* TheRival: Apparently, Galvans and Cerebrocrustaceans tend to have a rivalry over which one of them is the smartest species in the Universe; Cerebrocrustacean villain Dr. Psychobos' entire motivations revolve around proving his species is superior to the Galvans, Brainstorm once had a small argument on the subject with Azmuth, and Galvan minor characters Blukic and Driba have been known to make condescending comments about Cerebrocrustaceans at least twice in the show.
* SesquipedalianLoquaciousness: Cerebrocrustaceans as a whole seem to instinctively express themselves that way, and Brainstorm is no exception. This actually sometimes becomes a weakness, as he can distract himself during fights.
* StarfishAliens: Giant crab-like aliens with oversized heads, and shell capable of exposing their brains.
* SmartPeopleSpeakTheQueensEnglish: Why else would he have a UsefulNotes/{{British Accent|s}}?
* ShockAndAwe: His brain can generate electric attacks and forcefields by mere thought.
* SuperIntelligence: See ImprobablyHighIQ above. His brain operates like a supercomputer, able to solve insanely difficult calculations in seconds and predict exactly how each of the Vengers would behave during and after battle.
* {{Telepathy}}: Cerebrocrustaceans do not speak with their mouths. Instead, they mentally project their thoughts as sound waves. This can been through the fact that Brainstorm doesn't open his mouth when he talks, but did when he threw up in "War of the Worlds."
* TheSmartGuy: Replaced Grey Matter as this during the ''Alien Force/Ultimate Alien'' era.
* TookALevelInBadass: In ''Alien Force'' and ''Ultimate Alien'', his intelligence was a liability in combat rather than an asset; he never used it to fight tactically and was more likely to distract himself with his musings than anything else. He pulled off a physics simulation in his head once to win at golf but had never done anything like that in the heat of combat. In ''Omniverse'', he pulls off something akin to ''Film/SherlockHolmes2009'', effortlessly defeating his opponents through tactical use of his understanding of his opponents, his powers, and his environment.
* WallCrawl: He can scuttle along walls as easily as the ground.
* VocalEvolution: He has a different voice and accent in ''Omniverse'' as a result of Creator/CoreyBurton taking over and giving him an Austrian accent.
[[/folder]]

[[folder:Chromastone]]
!!'''Chromastone''' (AF-05)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/chromastone_1.png]]

->Voiced by Creator/DeeBradleyBaker (''Alien Force'', ''Ultimate Alien''), Creator/EricBauza (''Omniverse'')

Chromastone was sampled from Sugilite, the SingleSpecimenSpecies guardian of Petropia before Vilgax caused its destruction. A crystal-based alien, he possesses the ability to absorb light and energy, channeling them into attacks.
----
* BackForTheFinale: He shows up in the final episode of ''Omniverse'' after an extended absence. He later shows up in the final episode of the reboot used by ''Alien Force'' Ben against Alien X.
* {{Cyclops}}: He has a single eye on his head.
* CrystalDragonJesus: "Secret of Chromastone" reveals the alien who provided the sample for Chromastone was Sugilite, the guardian of Petropia, whose role was to allow the planet and its inhabitants to be reborn after their destruction by the hand of Vilgax.
* DivergentCharacterEvolution: He gained the ability to fly in Alien Force's season 3, contrasting him with the returning Diamondhead. This power never appears again in ''Omniverse'', [[OutOfFocus due to largely phasing him out]].
* DisneyDeath: Played with. Chromastone's body was destroyed by Vilgax in "Vengeance of Vilgax"; while Ben survived, his body was reformed into Diamondhead and Chromastone was seemingly lost for good. In "The Secret of Chromastone," however, Tetrax is able to revive Sugilite (Chromastone's genetic donor) from inside of Diamondhead, who tells him that Chromastone is still inside of the Omnitrix. Still, Ben continues to not use him for the remainder of ''Alien Force''. It's finally settled in ''Ultimate Alien'', where Ben uses him in the first episode and returns to using him regularly.
* EnergyAbsorption: His main power allows him to absorb any form of light or energy attack directed at him, then channel it into his own attacks.
* {{Flight}}: Gains this ability in "The Secret of Chromastone".
* LightEmUp: Though he lacks Diamondhead's GemstoneAssault ability, he trades it for an amplified ability to absorb light and energy in general, channel it inside his body, and redirect it as light-based attacks.
* LightningBruiser: He seems to be faster and more agile than Diamondhead, but not as strong and durable.
* NighInvulnerability: To date, ''Vilgax'' is the only one who ever managed to damage him.
* TheOnlyOne: He is the only being in the universe who can restore the dead planet, Petropia.
* OvershadowedByAwesome: His role as Ben's energy absorber is taken by Feedback in ''Omniverse''. In fact, when Ben tries to use him to [[spoiler: absorb the energy of Maltruant's Annihilarg]], the Omnitrix shifts through his alien forms until it gives him Feedback instead.
* PutOnABus: He only made one appearance in ''Omniverse'' near the beginning of the series, and it was just being used to test Blukic and Driba's new weapon. [[TheBusCameBack He didn't show up again until the finale]].
* RetCon: His biography initially introduced him as a separate species from Diamondhead, called Crystalsapiens, with their own planet known as Motoresi. This was retconned as a legend after "The Secret of Chromastone" revealed he actually was from the same planet as Diamondhead.
* RockMonster: Just like Diamondhead. His species is even from the same planet as him.
* ShiplessFasterThanLightTravel: A genetic duplicate of Chromastone can fly to his homeworld from Earth within minutes.
* SingleSpecimenSpecies: Sugilite, Chromastone's genetic donor, is the only Crystalsapien in existence.
* SuspiciouslySimilarSubstitute: To Diamondhead; ironically inverted in season 3 of ''Alien Force''.
* YouDontLookLikeYou: His first appearance in ''Omniverse'' had him looking exactly the same as he did in ''Alien Force'' and ''Ultimate Alien''. When he returns in "A New Dawn", his design is heavily modified, incorporating several more spikes, clothing, a different face, and a new body shape, bearing a resemblance to [[Franchise/TeenageMutantNinjaTurtles the Shredder]].
[[/folder]]

[[folder:Echo Echo]]
!!'''Echo Echo/Ultimate Echo Echo''' (AF-02, UA-11)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/echo_echo_uaf.png]]
[[caption-width-right:350:[[labelnote:Click here to see Ultimate Echo Echo]]\\
https://static.tvtropes.org/pmwiki/pub/images/ultimate_echo_echo.png[[/labelnote]]]]

->Voiced by Creator/DeeBradleyBaker

Echo Echo was sampled from a Sonorisian from Sonorisia. Massive, majestic gorges and immense, breath-taking canyons displaying beautiful layers of multi-colored strata from their gradual formation over the ages can be found all over Sonorosia. Sonorosians are the only natives with the innate ability to manipulate sound waves, but other creatures on Sonorosia are able to take advantage of the planet's cavernous topography, utilizing different specific locations on the landscape as whisper chambers or to generate echoes as a defense mechanism. They use the immense gorges to use echolocation to find each other.\\\

Ben 23's version is named ''Copy-Copy''.
----
* AttackDrone: Ultimate Echo Echo trades the DoppelgangerAttack for a series of floating discs that act as speakers for his sonic attacks. "Sonic Doom" is his most powerful and devastating move, which bombards an opponent with an omnidirectional sphere of ear-splitting sonic waves.
* CallingYourAttacks: He has names for several of his moves, such as "Wall of Sound" (a row of clones screaming all at once) and "Echo Chamber" (a group of clones screaming from different directions). Ultimate Echo Echo has "Sonic Doom" (a group of sonic discs surrounding the opponent in every direction and blasting them all at once).
* CombinationAttack: All of his {{Signature Move}}s involve either multiple clones or sonic discs.
* DoppelgangerAttack: He uses his clones to create many powerful combo attacks.
* EvolutionPowerUp: Ultimate Echo Echo is arguably Ben's most powerful Ultimate Alien (besides Way Big, of course). While losing his ability to clone himself, he obtains detachable sonic discs that come from the light-blue holes on his body that are powerful enough to contain a nuclear explosion and can replicate themselves in case Ultimate Echo Echo needs more firepower. His unique use of decibel force leaves him unrivaled, even when facing Ultimate Kevin.
* {{Flight}}: Ultimate Echo Echo gains the power to fly.
* LiteralSplitPersonality: If several Echo Echo clones all turn back into Ben at once, the result is multiple Bens but inheriting a different part of his personality.
* MakeMeWannaShout: Sonic screams are his basic form of attack.
* PintSizedPowerhouse: One of the smallest aliens, but he packs a punch with his sonic scream.
* PoweredArmor: Echo Echo's body seems to be either a small robot or containment suit of some kind. This can be seen not just through his appearance and voice, but the fact that when his clones are destroyed in battle, nothing appears to be inside of them.
* RoboSpeak: Sounding like a speech synthesizer as Echo Echo, but loses any inflection and goes straight into MachineMonotone as Ultimate Echo Echo.
* SelfDuplication: Unlike Ditto, however, the duplicates are not constantly synced to each other, so it is possible for each one to transform into different forms separately, as seen in the episode "Duped" of ''Ultimate Alien''. Ultimate Echo Echo does not have this power, at least on his own; instead, his discs are the ones that duplicate.
* TheStoic: Ultimate Echo Echo's voice is very deep and subdued compared to the shrill and screechy Echo Echo, indicating a huge change in power and disposition.
* StoryBreakerPower: Both regular and Ultimate Echo Echo fit this to a certain degree. Ultimate Echo Echo's Sonic Doom has single-handedly defeated almost every opponent it's hit, up to and including Ultimate Kevin. Even with normal Echo Echo, though, his ability to duplicate with no drawbacks makes it extremely difficult to fully take him down. He even keeps a spare clone in his car just in case the others are somehow defeated.
* SuspiciouslySimilarSubstitute: To Ditto, being a small alien capable of duplicating, but with the added benefit that Echo Echo clones can die without harming the others.
[[/folder]]

[[folder:Goop]]
!!'''Goop''' (AF-09, RE-167-172)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/goop_uaf.png]]

->Voiced by Creator/DeeBradleyBaker

Goop was sampled from a Polymorph from Viscosia. A volcanic planet with a significantly lighter gravity than Earth, molten magma flows freely on Viscosia, constantly shaping and reshaping the jagged planetary surface in its path. Lava weeps out from fissures in the ever-changing landscape. Polymorphs are unicellular organisms capable of shaping themselves as they want and float on the planet's lighter gravity.\\\

Ben 23's version is named ''Muck-O-Muck''.
----
* AcidAttack: He can turn himself into living acid.
* BlobMonster: He is made of a slimy, liquid substance that requires a UFO-shaped anti-gravity device to move and keep himself together. As a result, he can alter his shape and fly as long as the device isn't damaged or shut down.
* ConfusionFu: His lack of anatomy means he could throw a punch from any part of his body if he so chose.
* CoveredInGunge: Not him, but others when he takes a hit.
* GoodColorsEvilColors: Aside from the eyes and Ultimatrix symbol, in ''Omniverse'', Albedo's Goop has a red body and Anti-Gravity Projector, in contrast to Ben's green.
* NighInvulnerability: By way of being made of fluids. (See BlobMonster)
* TastesLikeChicken: According to WordOfGod, Goop has flavors. Ben is lime-flavored, Albedo is raspberry, Ben 23 is blueberry, Bad Ben is licorice, Mad Ben is sour orange, Nega Ben is black pepper, and Benzarro is grape.
* VoluntaryShapeShifting: To a point. He can flow through any opening his little saucer can get through.
* WeaksauceWeakness: Take away his saucer, and he's immobilized. Ben uses this to get the Omnitrix back from Vilgax on Primus.
[[/folder]]

[[folder:Humungousaur]]
!!'''Humungousaur/Ultimate Humungousaur''' (AF-02, UA-06 [[note]]Although he was used by Albedo in AF-45[[/note]], RE-82)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/humungousaur.png]]
[[caption-width-right:350:[[labelnote:Click here to see Ultimate Humungousaur]]\\
https://static.tvtropes.org/pmwiki/pub/images/ultimate_humungousaur.png[[/labelnote]]]]
[[caption-width-right:320:[[labelnote:Click here to see Ultimate Humungousaur as used by Albedo in Omniverse]]\\
https://static.tvtropes.org/pmwiki/pub/images/negative_ultimate_humungousaur.png[[/labelnote]]]]

->Voiced by Creator/DeeBradleyBaker (''Alien Force'', ''Ultimate Alien''), Creator/JohnDiMaggio (''Omniverse''), Creator/DavidKaye (''Reboot'')

Humungousaur was sampled from a Vauxausaurian from planet Terradino. A beautiful, mountainous, and lush world, Terradino is home to a vast and varied number of diverse animalistic alien species, many creatures great and small. Tragically, all these different species have not evolved to live here together peacefully. Warring factions in every group constantly seek to wrench control of society for themselves. However, the Vaxasaurians have been able to temporarily restore order through their sheer physical superiority.\\\

Ben 23's version is named ''Dino-Mighty''.
----
* AdaptationalWimp: Humungousaur cannot change his size in the reboot.
* AppropriatedAppellation: In the reboot series, he is given his name by a little girl bystander.
* AtrociousAlias: It's a good thing a little girl suggested his name in the reboot because Ben's ideas were "Gigantigecko", "Iguana Monster", "Roar Thing" and "Mega-Stega Dude".
* AttackOfThe50FootWhatever: Not as tall as Way Big, but his regular size still goes around a ''Tyrannosaurus rex'', and he can grow again to 60 feet.
* TheBigGuy: He serves as the [[SuspiciouslySimilarSubstitute replacement for]] Four Arms in ''Alien Force''. After Four Arms is brought back, both fill the role together.
* CompositeCharacter: The reboot incarnation incorporates the spiked tail from Ultimate Humungousaur.
* DivergentCharacterEvolution: Zig-Zagged. Humungousaur originally was able to change his size, but this power gradually stopped appearing, which made him just another alien with SuperStrength. The reboot, however, gives him a spiked tail similar to Ultimate Humungousaur's, and it has the ability to send out shockwaves, which makes him a bit more distinct from Four Arms.
* EpicFlail: Ultimate Humungusaur has a [[BewareMyStingerTail club-tail]] like an [[http://en.wikipedia.org/wiki/Ankylosaur Ankylosaur]], only his has a mace-like spiked ball.
* EverythingsBetterWithDinosaurs: The only dinosaur-like alien of the ''Alien Force'' era, and he becomes even more dinosaur-like as Ultimate Humungousaur.
* EvolutionPowerUp: In his ultimate state, Humungousaur loses his ability to grow, instead being fixed at his largest optimal size. He also becomes stronger, heavier, and gains Gatling gun knuckles that shoot regenerating bone bullets.
* LightningBruiser: He's pretty agile for his size, and has been shown doing somersaults and flips.
* MakeMeWannaShout: In the Reboot, hitting something hard enough with his armored tail creates a powerful sonic attack.
* MakeMyMonsterGrow[=/=]SizeShifter: He was initially introduced as capable of growing to 60 feet with additional strength as a result. [[ForgotAboutHisPowers Then the writers apparently forgot he could do that, and he hasn't done it since "Video Games"]]. He lacks this power in the reboot.
* MoreDakka: Ultimate Humungusaur can turn his hands into four-barrel rocket launchers.
* NotZilla: As close to this trope as one of Ben's aliens can get, especially when he grows to his full size. He doesn't have a BreathWeapon, though.
* OneManArmy: He is one of the best aliens to take on multiple aliens. In ''Omniverse'', he was able to take on a large portion of Ben's rogue gallery all at once.
* SuperStrength: Sure, his size should give him away. But even then considering he can raise a ''house'' on his own, and can throw objects well past orbit...
* SuperToughness: Took lasers and missiles directly and only staggered.
* SpellMyNameWithAnS: WordOfGod says that his name was originally spelled Humun'''go'''saur, and the extra "u" was a typo that stuck, much to Dwayne's displeasure.
* SpotlightStealingSquad: The most frequently used alien in ''Alien Force'' (after Jetray) and ''Ultimate Alien'', and the most frequently used for combat. Whenever there's an uncertain enemy, Ben will most likely reach for Humungousaur. It's averted in the first two seasons of ''Omniverse'', whereas part of a RunningGag each time Ben tries to select Humungousaur, the Omnitrix gives him something else.
* SuspiciouslySimilarSubstitute: To Four Arms in ''Alien Force'' and ''Ultimate Alien'', as both are the large strength aliens.
* UnderwearOfPower: He wears a pair of black briefs in ''Omniverse''.
* TheWorfEffect: In ''Alien Force'', Albedo as Ultimate Humungousaur curbstomped Ben as Humungousaur. In ''Omniverse'', Ben easily defeats Negative Ultimate Humungousaur as Feedback.
* TopHeavyGuy: His torso is enormous and his arms very lengthy, reaching his knees. By comparison, his legs are about a third of the size of his arms.
* YourSizeMayVary: Even after Humungousaur stopped using his SizeShifter abilities, he still hasn't been shown at a consistent size. While he never nears the skyscraper size he originally had, he ranges from only a head or two taller than the humans to bigger than a small house.
[[/folder]]

[[folder:Jetray]]
!!'''Jetray''' (AF-03, RE-134)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/jetray_3.png]]
->Voiced by Creator/DeeBradleyBaker

Jetray was sampled from an Aerophibian from planer Aeropela. An oceanic planet completely covered in water with giant spiral rocks protruding out of the sea, Aeropela is constantly visited by fog, rain, and hurricanes, as well as the occasional monsoon or tsunami. Aerophibians have evolved to fly, swim and survive in this harsh climate, building their cities inside the planet's spiral rocks. In prehistoric times, their primitive ancestors used their abilities to shoot neuroshock blasts to paralyze and catch their prey. Nowadays, they still possess this ability, but use it more for self-defense.
----
* BatmanCanBreatheInSpace: Jetray can survive in and travel through space. Apparently, this is a major reason he was introduced in the reboot.
* BewareMyStingerTail: His tail can shoot neuroshocks. This has caught numerous opponents off guard trying to counter his EyeBeams.
* TheBusCameBack: Despite being sidelined in ''Omniverse'', Jetray makes a return to active use in Season 4 of the reboot.
* ContrastingSequelMainCharacter: He replaces [=XLR8=] as the primary means of transport during the ''Alien Force''/''Ultimate Alien'' era, though their power sets are quite different. [=XLR8=] is great for land travel and useful for melee combat, while Jetray is used for air travel and ranged combat with his neuroshocks.
* {{Expy}}: His abilities are exactly like Zok from the Herculoids.
* EyeBeams: He can shoot powerful beams called neuroshocks from his eyes (and tail).
* {{Flight}}: Replaced Stinkfly in the ''Alien Force'' era, and later in Season 4 of the reboot, as Ben's main flyer.
* FlyingFirepower: Can fly at high speed. Can also shoot neuroshock blasts from his eyes and tail.
* FragileSpeedster: Ben's fastest alien in ''Alien Force'' era and remains one of the fastest period, behind [=XLR8=] and Fasttrack. However, he isn't very tough and goes down quite easily if he gets hit.
* HowDoIShootWeb: Reboot Ben has a hard learning curve in mastering his flight powers in comparison to Stinkfly.
* InformedAbility: According to his official profile, he can breathe underwater; this was never shown (the only times we see him underwater, he quickly gets out of it).[[note]]This also fits under IfItSwimsItFlies.[[/note]]
* PutOnABus: It's one of four aliens to not appear in ''Omniverse''.
* ShiplessFasterThanLightTravel: In one episode, Jetray enters hyperspace and flies halfway across the galaxy in just a few seconds.
%%* SuperSpeed: In the skies and underwater, but not on land.
* SuspiciouslySimilarSubstitute: Jetray is practically one to Ripjaws as the main aquatic alien in ''Alien Force''.
[[/folder]]

[[folder:Lodestar]]
!!'''Lodestar''' (AF-31)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/lodestar_ov.png]]

->Voiced by Creator/DeeBradleyBaker

Lodestar was sampled from a Biosorvotian from an unknown planet. He has powerful magnetic abilities.
----
* BarrierWarrior: He can create a magnetic barrier in front of him that repels all metallic objects.
* DemotedToExtra: He only made three appearances in ''Omniverse''. Somewhat excusable due to Gravattack, [[OvershadowedByAwesome whose mastery over physics pretty much makes him more useful than Lodestar]].
* EarlyBirdCameo: In the ''Alien Force'' season 2 finale with Ben discovering his hologram.
* FromASingleCell: He can regenerate from even a single sliver of his body, a power revealed in the aftermath of his body being completely blown apart.
* FloatingLimbs: His head floats above his body via magnetism (it can even be knocked away and come right back).
* {{Flight}}: He can use his magnetic powers on himself to fly.
%%* IncomingHam: "LOOOODESTAAAAARR!!"
* InvisibleAnatomy: His head seems to be nothing more than a metal ball held up by a magnetic field, but his body comes along if it's moved.
* LosingYourHead: Lodestar's head can be knocked away from his body by a powerful enough force, resulting in some humorous moments where the body aimlessly wanders around for it (with the head itself trying to direct it).
* MagnetismManipulation: His main gimmick is harnessing magnetism to control metal.
* PullingThemselvesTogether: Does it when he gets blown up in "Ultimate Aggregor".
* RoboSpeak: Like Echo Echo, he has a synthesizer-voice.
* SelectiveMagnetism: His main power. His magnetic rays can either lift metal objects like telekinesis or attract metal objects toward a specified opponent.
[[/folder]]

[[folder:Nanomech]]
!!'''Nanomech''' (Alien Swarm)
[[quoteright:230:https://static.tvtropes.org/pmwiki/pub/images/Omniverse_S1E5_Nanomech_8791.png]]

->Voiced by Alex Winter (''Alien Swarm''), Creator/DeeBradleyBaker (''Ultimate Alien'', ''Omniverse'')

Introduced in the movie ''Film/Ben10AlienSwarm'', Nanomech was sampled from the Hive, a species of nanomechanical parasite life forms that intended to rule over Earth then. Due to some weird result of the DNA combination, Nanomech retains some human features compared to his natural species' usual state. A living nanorobot, he is incredibly small and can shrink even further.\\\

Ben 23's version is named ''Teeny-Weeny''.
----
* CanonImmigrant: Nanomech made the transition to the cartoon due to the fact that ''Alien Swarm'' is canon to the main timeline.
* CurbStompBattle: An extremely {{iron|y}}ic one: Ben's Nanomech easily defeated Mad Ben's ''Way Big'' by flying inside his head and shooting his brain until he fell over.
* CyberCyclops: Yet another of Ben's one-eyed aliens.
* FlyingFirepower: A rather weak one, but he can still fly and shoot electrical attacks.
* HalfHumanHybrid: Compared to the original version of the species he was sampled from, Nanomech possesses more humanoid features. This actually makes him stronger than a regular drone of his species.
* HeliumSpeech: For ''Ultimate Alien'', to go with his microscopic stature. Although this only applies to people larger than he is (Ie humans) to other creatures Nanomech's size his voice is relatively deep.
* HiveMind: In ''Alien Swarm'', turning into Nanomech made him hear the voice of the Queen. Luckily, he resisted.
* IncredibleShrinkingMan[=/=]{{Sizeshifter}}: And he ''starts'' at about an inch. Nanomech can shrink so small he could maneuver between the lava droplets of an eruption.
* JokeCharacter: He's Ben's smallest, and by extension frailest alien, which leads to a number of humiliating defeats. Examples include being crushed inside of a book, and in another episode hit by a flyswatter.
* LethalJokeCharacter: Much like Grey Matter, he is small and possesses weak attacks, but he can be used to destroy robots from the inside. Not to mention his size and abilities actually make him the perfect opponent to defeat a ''To'kustar''.
* MechanicalLifeforms: Based on a species of nanomachines.
* ShockAndAwe: Nanomech can unleash a powerful electrical attack.
* SiliconBasedLife: Kevin describes the nanomachines as such in ''Alien Swarm''.
* WingedHumanoid: He has four bug-like wings. The show forgot the first time for no apparent reason, but they remembered later.
[[/folder]]

[[folder:Rath]]
!!'''Rath/Ultimate Rath''' (AF-39, RE-84)
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/1524021_7492.jpg]]
[[caption-width-right:320:[[LargeHam LEMME TELL YA SOMETHING, TROPER WHO IS READING THIS PAGE RIGHT NOW]]...]]

[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/lucha_rath_5842.png]]
[[caption-width-right:320:[[labelnote:Click here to see Ultimate Rath as used by Albedo]]\\
https://static.tvtropes.org/pmwiki/pub/images/ultimate_rath_ov.png[[/labelnote]]]]
->Voiced by Creator/JohnDiMaggio (''Alien Force'' to ''Omniverse''), Creator/DeeBradleyBaker (''Reboot'')

Rath's DNA was sampled from an Appoplexian from Appoplexia. A species of sentient, anthropomorphic tiger-like beings, Appoplexians are HotBlooded, [[BloodKnight aggressive]], [[LeeroyJenkins short-tempered and not very smart, believing you can solve any problem by hitting it]] ([[ExactWords Or, sometimes, just by "hitting things a lot"]]). They do, however, possess [[SuperToughness high durability]], as well as [[LightningBruiser ridiculous strength and reflexes]].\\\

Ben 23's version is named ''Tigerizer''.[[labelnote:*]]According to Derrick J. Wyatt’s [[https://twitter.com/DerrickJWyatt/status/1245935677134368768?s=20&t=NzyKu2otqJLCuvIvO1D-WQ Twitter]][[/labelnote]]
----
* AbsurdlySharpBlade: He can cut ''an entire giant rock'' in two with just one of his claws.
* AndThisIsFor: He does this while fighting Poltroon in "Food Around the Corner", putting him on the receiving end of a few wrestling moves.
-->'''Rath:''' (''grabs Poltroon’s arm'') This is for trying to blow up my people! (''throws him a good ways down the hall'') This is for trying to blow up ''your'' people! (''jumps at him, giving him a knee to the chest, then grabs him by the shoulders'') AND THIS IS FOR TRYING TO BLOW UP ''ME''!
* BadassBoast: His "Let me tell you something" speeches are intended to be this. It usually ends up more like parodying it, but on occasions, he can actually give quite awesome ones; the one he delivered to Jarett of the Pantophage was particularly epic.
-->'''Rath''': Let me tell you something, Jarett of Pantophage! I just jumped down your throat! You start a war with the Lewodans, and I will do it again, only ''this time'', I will knit your intestines ''into a sweater!''
* BerserkButton: Well, technically, he is angry all the time, but there are two major buttons that make him ''angrier'' than usual:
-->"[[EatsBabies Eating. Babies.]] [[PunctuatedForEmphasis Is.]] ''[[AndThatsTerrible Not.]]'' [[PreAssKickingOneLiner COOL!]]"
-->"You can hurt me. You can hurt the things I stand for! You could even hurt my feelings, if I had any! But ''nobody'', and I mean ''NOBODY'', hurts the [[TrademarkFavoriteFood smoothie]]!"
* TheBigGuy: Right behind the likes of Four Arms and Humungousaur in terms of sheer brute strength, but with the added benefit of agility and WolverineClaws.
* BloodKnight: He loves violence.
* BoisterousBruiser: Every line out of his mouth is in the style of a pro wrestler.
* BreakoutCharacter: Ever since Rath was unlocked in ''Alien Force'', he quickly became very well-liked and is one of Ben's most used alien forms. He was also the first ''Alien Force'' alien to make the transition to the reboot, with Dr. Animo briefly becoming Rath in Season 2, before Ben fully unlocks him in Season 3.
* CallingYourAttacks: In the form of Constellation/Star + wrestling move = "Polaris Pile Driver!"
* CatchPhrase: "Lemme tell ya somethin', ([[FullNameUltimatum full name here]])..." WordOfGod states that, in his ultimate form, Rath's catchphrase becomes: "Lemme tell ya FIVE things, (full name here)..." [[invoked]]
* CatsHateWater: ''Omniverse'' increased his catness, and thus gained a dislike of water.
* DestructiveSavior: In spades. His clumsiness and violent behavior often result in property damage.
* DumbMuscle: The only one of Ben's physically strong aliens (up to that point in the series) to be this. Whereas all other aliens can cause destruction but are fully controlled, Rath is the only transformation where Ben gets dumber and much more aggressive, making it one of his least controllable forms. However, since he usually uses it for heavy combat, he doesn't really mind.
* EvolutionPowerUp: In the Ultimatrix simulations, the rage of Ultimate Rath's ancestors is downplayed to prolong his survival and he is less impulsive thusly. He also becomes bigger, stronger, meaner, and ''cooler'' of all things. He gains additional claws not only on his knuckles, but also on his fingers, toes, and elbows, plus three spikes on his hunched back.
* ExposedExtraterrestrials: In the ''Omniverse'' episode "Food Around the Corner", it’s revealed he’s this even by his own species’ standards, as it turns out despite their loud and aggressive demeanor, Appoplexians have an advanced sense of shame.
* {{Expy}}: Personality-wise, he's a tiger version of wrestlers like Hulk Hogan and Randy Savage. His appearance such as his claws and animalistic nature make him a WolverineWannabe, with Ultimate Rath blending it with Kraven the Hunter.
* {{Flanderization}}: ''Omniverse'' flanderizes his cat-like aspects via making him afraid of water (even though tigers have no problem with water), distracted by string-like objects and laser pointers, and vulnerable to Nyancy Chan's cat control powers (even though Rook, who is also a cat-like alien, couldn't be controlled).
* FullFrontalAssault: Ben was not happy to find out that members of Rath's species normally wear clothes.
* FullNameBasis: Addresses everyone by their full name and title most if not all of the time, most prominently during his "Lemme tell ya something..." speeches.
* HairTriggerTemper: This is a ''genetic'' trait amongst Appoplexians. Good luck finding anything that ''doesn't'' make Rath mad.
* HorrifyingTheHorror: The Vreedle Brothers are noticeably nervous the first time they encounter him. As Octagon says, Appoplexians are meaner and stupider than they are. Their concern quickly proves justified, as Rath pummels them and anyone trying to help them.
* ImmuneToBullets: Neither bullets nor lasers can hurt him.
* JackOfAllStats: He isn't the physically strongest alien (that would be Four Arms, Humungousaur, or Way Big), he isn't the most agile alien (that would be either Spidermonkey or Crashhopper), he isn't the most skilled martial artist (that would be Kickin Hawk). But he performs well in all physical areas which makes him one of Ben's most useful aliens for hand-to-hand combat.
* JerkWithAHeartOfGold: Despite his claims to the contrary, he warms up to the puffball he was escorting, reacting violently when it was eaten.
* LargeHam: It wouldn't be Rath without him shouting "LET ME TELL YOU SOMETHING..." and charging ahead with dramatic wrestling moods.
* LightningBruiser: He's extremely strong, can survive dropping from thousands of feet in the air (To the point that he tries to ''kick'' the Rath-shaped crater he made), and isn't affected by lasers at the slightest (there are burn marks ''around'' him). The only things that prevent him from mauling everyone in sight are his limited intelligence and HairTriggerTemper.
* LeeroyJenkins: Is always itching for a fight and will charge head-first into danger.
* LiteralAssKicking: One of his signature moves is called "Sirius Butt-Kicking," which is ExactlyWhatItSaysOnTheTin.
* MaskedLuchador: In "Secret of Dos Santos", Skurd fixes the Omnitrix error that made Rath naked, giving him a green luchador outfit and making him speak in Spanish.
* MeaningfulName: (W)Rath, the "Appoplexian". Doesn't get much more obvious than that.
* MegaNeko: He looks like a big anthro tiger.
* {{Metaphorgotten}}:
** In "The Con of Rath"
--->'''Rath:''' A man's food is his castle!\\
'''Ocatagon:''' I think you just and mixed your metaphors.
** And in "Above and Beyond"
--->'''Rath:''' You want a piece of Rath? You got a piece! But you just bit off an eye bigger than your stomach can chew!\\
'''Manny:''' [[LampshadeHanging That made no sense]].\\
'''Rath:''' ({{Beat}}) [[BlatantLies I KNOW]]!
%%* MrFanservice: In his Luchador Outfit
* NakedPeopleAreFunny: ''Omniverse'' reveals that Appoplexians have a sense of shame, and typically wear clothes. Rath doesn't. According to WordOfGod, Rath is naked because of a horrible error on the part of the Omnitrix. [[invoked]]
* TheNicknamer: Calls Vulkanus "Baby Man", and Seven-Seven "Karate Man".
* NighInvulnerable: Getting hit with a laser doesn't phase him, nor does dropping out of the sky and causing a giant crater of him knock him out.
* NinjaPirateZombieRobot: An alien who looks like a tiger and fights and acts like a wrestler. That sums him up.
* NoIndoorVoice: This is pretty much his standard way to talk. He only lowered his voice once in the whole franchise.
* OneWingedAngel: In "Malgax Attacks", Albedo uses his Ultimatrix to go [[http://img2.wikia.nocookie.net/__cb20141108002912/ben10/images/4/40/Ultimate_Rath_OV.png Ultimate Rath.]]
* PapaWolf: After warming up to the Tiffin. To the point that he'd ''knit a sweater out of an alien's organs'' if it declared war.
* PassThePopcorn: Kevin and Gwen both admit that Rath is the only alien that makes them want to sit down with some popcorn and enjoy the show.
* StellarThemeNaming: His wrestling moves are based on stars. It is lampshaded when it comes to "Sirius Butt-Kicking!"
-->'''Manny:''' So, is that "Sirius" like the star, or "serious" like important?\\
'''Rath:''' Like the star!
* SpikesOfVillainy: Ultimate Rath is used by Albedo and is covered in claws and spines.
* SuperStrength: He can throw a tank.
* ThirdPersonPerson: Outside of his {{catchphrase}}, Rath almost always refers to himself in the third person.
* {{Tsundere}}: It is possibly parodied; he has a soft spot for his friends, but usually blows them off with a "Whatever!"
-->'''Rath''': Let me tell you something, alien partner that I never wanted in the first place, but am begrudgingly starting to like, IN SPITE OF MYSELF!
* UnstoppableRage: He basically exists in this state. Ben usually selects him for opponents that he has no desire to hold back on.
* WeaksauceWeakness: "Gone Fishing" reveals that Rath, being a cat-like alien, is terrified of water.
* WhenAllYouHaveIsAHammer: Kevin notes that all of Rath's species believes that anything can be solvable by hitting it. According to Rath, this is incorrect -- "[[ExactWords Sometimes you just need to hit things a lot]]."
* WolverineClaws: Except he only has one on each hand. In the middle of them. Ultimate Rath has an extra claw on each hand, making him closer to the TropeNamer.
* WolverineWannabe: Rath is from a tiger-like alien species of a BloodKnight ProudWarriorRace called Appoplexians, who possesses WolverineClaws, are aggressive, and love trash talking. His design is even reminiscent to his [[https://uncannyxmen.net/sites/default/files/images/characters/wolverine/wolv-bigcostume2.jpg first costume]].
* WrestlerInAllOfUs: Piledrivers and Armbars galore. "Secret of Dos Santos" takes this to its logical conclusion and turns him into a luchador.
[[/folder]]

[[folder:Spidermonkey]]
!!'''Spidermonkey/Ultimate Spidermonkey''' (AF-08, UA-01, RE-173-176)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/spidermonkey_uaf.png]]
[[caption-width-right:350:[[labelnote:Click here to see Ultimate Spidermonkey]]\\
https://static.tvtropes.org/pmwiki/pub/images/ultimate_spidermonkey.png[[/labelnote]]]]
[[caption-width-right:320:[[labelnote:Click here to see Ultimate Spidermonkey as used by Albedo in Omniverse]]\\
https://static.tvtropes.org/pmwiki/pub/images/negative_ultimate_spidermonkey.png[[/labelnote]]]]

->Voiced by Creator/DeeBradleyBaker, Creator/PaulEiding (Albedo as Ultimate Spidermonkey, ''Omniverse'')

Spidermonkey was sampled from an Arachnichimp, a species of sentient monkey-like aliens with arachnoid features from Arachscimia. Arachscimia is a jungle-like planet with incredibly tall trees and large, dangerous predators on the ground. As a result, Arachnichimps have to live in the trees in elevated houses to survive.\\\

Ben 23's version is named ''Mr. Monkey''.
----
* {{Acrofatic}}: Ultimate Spidermonkey is remarkably faster and more agile than his massive size would suggest.
* AllWebbedUp[=/=]ProjectileWebbing: He shoots sticky webbing from his tail to trap enemies, blind them, or swing across long distances.
* BreathWeapon: His Ultimate form shoots webbing from his mouth.
* BuildingSwing: He can travel via web-slinging in the same vein as Spider-Man.
* FragileSpeedster: As nimble as he is, he's not one who can easily bounce back from damage.
* EvolutionPowerUp: Though he gains a massive boost in strength, Ultimate Spidermonkey's powers are dependent on which version is in question due to the huge change made to his four extra limbs. In ''Ultimate Alien'', he gains four giant spider legs that he can use similarly to [[Characters/MarvelComicsOttoOctavius Doctor Octopus]]'s arms, either to increase his mobility or be used as sharp weapons. In ''Omniverse'', his extra ''legs'' become extra ''arms'' which add to his strength and dexterity. In both versions, his spinner moves from his tail to his mouth when undergoing evolution.
* LightningBruiser: Ultimate Spidermonkey is as nimble as regular Spidermonkey, but with enough strength to rival Four Arms.
* MultiArmedAndDangerous: Spidermonkey has four arms, and has an exceptional mix of strength, speed, and agility. In ''Omniverse'', Ultimate Spidermonkey has six arms and is even stronger.
* ShoutOut: To Franchise/SpiderMan. He has virtually all the same powers as Spidey (minus SpiderSense) and becomes noticeably sillier and more jokey in this form. Ultimate Spidermonkey and his SpiderLimbs (at least in ''Ultimate Alien'') is a shout-out to Spider-Man's ArchEnemy, Doctor Octopus.
* SpiderLimbs: Ultimate Spidermonkey trades the additional arms for four spider-like legs. In ''Omniverse'', the spider legs are replaced with gorilla arms.
* SuperStrength: He's ''much'' stronger than his size would suggest, able to pick up a street light and send Ultimate Kevin flying across the block with it. Ultimate Spidermonkey is even stronger, enough to match Four Arms and briefly trade blows with Ultimate Aggregor.
* SuperToughness: Ultimate Spidermonkey is shown to be able to survive a close-range nuclear explosion.
* WallCrawl: Unsurprisingly, he can stick to walls, much like a real spider and the webhead he's based on.
[[/folder]]

[[folder:Swampfire]]
!!'''Swampfire/Ultimate Swampfire''' (AF-01, AF-46)
[[quoteright:312:https://static.tvtropes.org/pmwiki/pub/images/Swampfire_Basic_Training_9671.PNG]]
[[quoteright:312:https://static.tvtropes.org/pmwiki/pub/images/swampfire_ov_8062.png]]
[[caption-width-right:327:[[labelnote:Click here to see Ultimate Swampfire]]\\
https://static.tvtropes.org/pmwiki/pub/images/ultimate_swampfire.png[[/labelnote]]]]

->Voiced by Creator/DeeBradleyBaker (''Alien Force'', ''Ultimate Alien'', ''Omniverse'' proper), Creator/DavidKaye (''Omniverse 2'' video game)

Swampfire was sampled from a Methanosian from planet Methanos. Methanos is a swampy planet, bathed in stinky methane that would be toxic to humans. Its inhabitants, the Methanosians, originally were carnivorous plants that over time evolved into humanoid herbivores. They possess the ability to generate methanes and use it to produce fire.\\\

Ben 23's version is named ''Mr. Mucky''.
----
* ADayInTheLimelight: After being DemotedToExtra in ''Omniverse'', the episode "Charmed, I'm Sure" centers around Swampfire's blossoming puberty. He's the only alien Ben turns into for the entire episode as he transitions into a more powerful form.
* ArtEvolution: In his first appearance in ''Omniverse'', he was almost unchanged from his ''Alien Force''/''Ultimate Alien'' design. In "Charmed, I'm Sure", he was redesigned to look more "fiery".
* BadassAdorable: Pre-puberty. Just look at his first picture!
* ComboPlatterPowers / CompositeCharacter: Combines the powers of Wildvine and Heatblast into a single form.
* CuteLittleFangs: Though only visible when up-close. They're most notable at the start of "Prisoner 775".
* DemotedToExtra: In the first few seasons of ''Omniverse'', Swampfire was mostly limited to a few non-speaking cameos despite being one of Ben's most prominent aliens in ''Alien Force'' and ''Ultimate Alien''. Subverted in the episode "Charmed, I'm Sure," where he plays an important role for the whole episode.
* DisneyDeath: Both were briefly lost in the battle against Eon, who turned them to dust, but were "revived" by Ben 10,000 at the end.
* ElementalPowers: Both Chlorokinesis and Pyrokinesis, though the latter is limited to expelling it from his palms.
* EvolutionPowerUp: Ultimate Swampfire has one of the most drastic appearance changes out of every Ultimate form. His vines change into wood and his flowers turn into some volatile blue goo sacs, which extends to his seed bombs. Whatever blue goo courses through him also amplify his flame-shooting hand vents, giving his flames the appearance of lasers. Strangely enough, despite being made of wood, Ultimate Swampfire's wooden body parts are still conductive.
* GreenThumb: In addition to being himself a plant, he can generate a gas that allows him to control plants. If there are no plants in the area, he can also spawn seeds that produce incredibly fast-growing plants.
* GoodThingYouCanHeal: Regular Swampfire tends to very frequently get shredded, mutilated, or even blown up to pieces compared to other aliens.
* HealingFactor: He can grow back limbs, his head, even his entire body when he's been cut to pieces. Ultimate Swampfire trades this for enhanced durability.
* {{Hunk}}: Post-puberty. Yeah, you know it's true. He's ''[[IncrediblyLamePun hot]]''!
* KamehameHadoken: Ultimate Swampfire can shoot a large blast of blue flames from his palms.
* KnockoutGas: He can release this from his palms.
* LanternJawOfJustice: After he blooms, his chin is much more pronounced, giving him a more traditional superhero-esque look.
* LightningBruiser: He is physically strong enough to defeat an armored alien in one punch, yet is as fast and agile as a human being.
* MidSeasonUpgrade: In "Charmed I'm Sure", Swampfire goes through puberty and evolves into a new, more powerful form. His ability to control plants and summon vines now function at will (before he had to spray a plant with gas to control it, and his vines only sprouted up wherever he tossed his seeds) and the vines he can summon are absolutely massive.
* MythologyGag: His adult form is based on unused concept art.
* PlantAliens: If you hadn't noticed by now, Swampfire is a humanoid plant.
* PlayingWithFire: He can shoot fire and throw fireballs from his hands.
* PubertySuperpower: Around the age of 16, Methanosians go through puberty and mature into a new, more powerful form. Similarly to Big Chill's pregnancy, this had an effect on Ben's human form, causing him to break out with acne.
* SuperStrength: Not the strongest alien in Ben's arsenal, but he still has enough physical strength to knock down armored knights, not to mention causing a [[SlaveMook DNAlien]] weather tower to crumble down.
* SuspiciouslySimilarSubstitute: To Heatblast as Ben's fire alien in ''Alien Force'' and ''Ultimate Alien'' before the alien form returns and they both get used. He also takes the place of Wildvine as the plant-based alien, with young Ben even calling him a “ripoff of Wildvine” upon seeing him.
* SwampMonster: Swampfire seems to invoke this. He is a PlantPerson with his body composed of vegetation and has GreenThumb powers. His species is stated to have evolved from carnivorous plants.
* WhenTreesAttack: Ultimate Swampfire resemble a tree.
* WhipItGood: After his puberty, he can grow vine whips from his hands that have burning tips.
[[/folder]]

!!''Ultimate Alien'' Aliens

[[folder:[=AmpFibian=] ]]
!!'''[=AmpFibian=]''' (UA-08)
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/640px-AmpFibian_001_8979.png]]

->Voiced by Creator/YuriLowenthal (in "Fused" and ''Omniverse''), Creator/DeeBradleyBaker (''Ultimate Alien'')

The last of the Andromeda Five to be obtained. Ampfibian was sampled from Ra'ad, who belonged to the Amperi, a species of ElectricJellyfish-like creatures with powerful electrical powers.\\\

Ben 23's version is named ''[=JellyFritz=]''.
----
* BackForTheFinale: ''Ultimate Alien'' Ben brings Ampfibian with him for the final part of the reboot.
* ElectricJellyfish: A jellyfish-like alien with powerful electrical abilities.
* ElectronicTelepathy: And a very powerful one, to the point where it can be used for MindReading and bodyjacking. Ben doesn't know how to do these, however.
* FragileSpeedster: He is the only one amongst the Andromeda Five to lack any natural armor or exoskeleton, but he makes up for it by being far more mobile and possessing a large number of versatile powers.
* IntangibleMan: Both by phasing through matter and turning himself into electricity to travel through circuits. Somehow, he can't phase through forcefields, though.
* PowerFloats: He can fly, though not very fast.
* ShockAndAwe: He's another addition to Ben's growing collection of electric aliens.
* StoryBreakerPower: Ampfibian is one of Ben's most powerful electric aliens, having no set threshold for how much electricity he can shell out at any given moment. It's an actual concern of Ben's as to whether or not Ampfibian is too powerful, given how one of his fears is accidentally killing Kevin (''an energy-absorbing being'') by shocking him too hard. And given that he actually managed to overload Phil, ''another'' energy-absorbing being, that fear seems to be justified.
* SuperNotDrowningSkills: Has the ability to breathe underwater.
* SuperpowerLottery: He has the biggest one amongst the Andromeda Five; his electrokinesis has many forms, including ElectronicTelepathy, intangibility, and straight-up ShockAndAwe powers.
* WeaksauceWeakness: Sort of. Despite being a jellyfish-like alien, and being able to breathe underwater, his electrical powers make him vulnerable to water. He can use his electricity just fine if he's fully submerged, but if he's using electricity while entering the water, or is only partially submerged, he will electrocute himself. [[invoked]]
[[/folder]]

[[folder:Armodrillo]]
!!'''Armodrillo''' (UA-09)
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/Armodrillo_9398.png]]

->Voiced by Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/JohnDiMaggio (''Omniverse'')

The fourth of the Andromeda Five to be obtained. Armodrillo was sampled from Andreas, a Talpaedan from the planet Terraexcava.\\\

Ben 23's version is named ''Toolboxx''.
----
* DishingOutDirt: Sort of; he has the ability to dig and cause earthquakes rather than directly controlling earth.
* GroundWave: He can create powerful shock waves and fissures with his jackhammer arms.
* MightyGlacier: The tallest and strongest of the Andromeda Five when it comes to brute strength, but also rather slow. That is, as long as he is not digging.
* PileBunker: His hands have the ability to move like a pile driver, with the intended effect of crushing rocks.
* ThisIsADrill: He doesn't really have one in the original show, but ''Omniverse'' portrays him spinning his hands like drills.
* SuperStrength: He's the most physically strong and tough of the Andromeda aliens, able to battle against several of Ben's rogues gallery all at once.
* TunnelKing: Described by Argit as able to move through earth as easily as we can swim through water.
* TheWorfEffect: In previous appearances, Armodrillo's armor is shown to be a highly condensed metal that is a bare-minimum evolutionary standard for natural talents in digging. In other words, he's been presented as a heavyweight and nigh-unstoppable tank. When fighting Princess Looma, who is half his size, she takes him attempting to impale her with a drill in stride and knocks him over quite easily, claiming that his drill claw "tickles."
[[/folder]]

[[folder:Chamalien]]
!!'''Chamalien''' (UA-32)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/chamalien.png]]

->Voiced by Creator/DeeBradleyBaker

Chamalien was sampled from the alien only known as Prisoner 775 in ''Prisoner 775 is Missing'' (although at the end of the episode the Ultimatrix calls it a Marlinisapien). This alien is a chameleon-like alien with the ability to turn invisible.
----
* BewareMyStingerTail: It's unknown if it has any properties besides stabbing, but Prisoner 775 threatened Colonel Rozum's life with it.
* BizarreSexualDimorphism: While Chamalien is lizard-like, Subdora, a female Merlinisapien seen in "Fight At the Museum", is taller, more humanoid, and has differently-sized eyes[=/=]lenses (and an Italian accent, for some reason).
* CheshireCatGrin: It smiles this way, and the similarity only gets stronger when it goes invisible.
* ChromaticArrangement: Wears a helmet with three different colored lenses; left (blue), right (red), and middle (green), which hide his [[ExtraEyes three eyes]].
* GlamourFailure: When invisible, he still casts a shadow.
* HollywoodChameleons: A chameleon-like alien with its camouflage ability exaggerated.
* {{Invisibility}}: His primary power, though it's not really invisibility so much as it is blending in with his surroundings like a chameleon.
* OvershadowedByAwesome: By the point Ben obtained him, he already had Ghostfreak, another alien who had invisibility, along with flight, intangibility, combat tentacles, and possession. As a result, he was by far one of Ben's least used aliens.
* PutOnABus: It was planned for him to appear in "Universe vs. Tennyson", used to spy on Chadzmuth. Script changes removed that plot point and he has no appearances in ''Omniverse''. [[invoked]]
* RedEyesTakeWarning: Albedo as Chamalien has all of his eyes red, unlike Ben where only one is red.
* ShoutOut: Chamalien could be called the shout out alien:
** His design and powers are similar to Randall from ''WesternAnimation/MonstersInc''.
** His three eyes are based on the 50s film version of ''Film/{{The War Of The Worlds|1953}}''.
** His grin, powers, and colors could be a reference to the Cheshire Cat.
* SlasherSmile: Taken straight from his DNA source.
[[/folder]]

[[folder:Clockwork]]
!!'''Clockwork''' (UA-47 [[note]]Used by Ben 10,000 in UA-30 and by Gwen in UA-44[[/note]])
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/clockwork_ov.png]]

->Voiced by Creator/DeeBradleyBaker

Clockwork was sampled from a Chronosapiens, a species of robot-like aliens with the ability to manipulate time.\\\

Ben 23's version is named ''Windy-Hindey''.
----
* AscendedExtra: Similarly to Arctiguana and Buzzshock, he was first seen as one of Ben 10,000's aliens before being used by present Ben. He is the only form to do so ''in the same series as his debut'' however.
%%* BlingOfWar: Except he's the SquishyWizard in practice.
* ClockworkCreature: As a Chronosapien, he looks like a walking wind-up toy.
* FusionDance: In "It's a Mad, Mad Ben World", he has Techno-Bubble (Ben 23's version of Upgrade) merge with him, enhancing his abilities. Unfortunately, Maltruant still defeats them.
* GlassCannon: His lasers can age you to dust in seconds, but one blast that other forms just shrug off is enough to knock him out and break his arm.
* InformedAbility: According to Ben 10,000, Clockwork can travel through time, but he's never actually been shown doing this. Even when upgraded by Techno-Bubble, he was unable to exit the timeline he was currently in.
* LightIsGood: Has a golden coloration, in contrast to Maltruant's RedAndBlackAndEvilAllOver.
* MechanicalLifeForm: Seriously, just look at the picture. It can even be merged with a Galvan Mechamorph (Upgrade).
* MoreDakka: Can shoot missiles when merged with Techno-Bubble.
* PensieveFlashback: Another ability of his is casting holograms of past events over the location where they happened, through whoever is around.
* PowerUpLetDown: When Clockwork merged with Techno-Bubble, despite his visible increase in power and stamina, his time ray was still unable to overpower Maltruant's. He was also unable to travel back to his timeline when they merged again in the next episode.
* ShoulderCannon: Has these when merged with Techno-Bubble.
* SquishyWizard: While his time powers are incredibly powerful, he's rather slow and physically clunky, with one shot from a laser blast being able to take him out.
* StoryBreakerPower: Clockwork's time beams can age anything to dust in seconds, so any enemy Ben hits with them will be killed almost instantly. Hence why Clockwork is never used in combat, unless it's against enemies with similar time powers like Eon. Maltruant, a villainous Chronosapien, demonstrates the full extent of this, being able to freeze time on a whim to dodge attacks, duplicate himself through rapid time-shifting, locally control the flow of time for anyone, and see the future.
* ThisIsADrill: Gains the ability to shape his hands into drills when fused with Techno-Bubble.
* TimeMaster: Clockwork's control over time is so powerful that he can casually destroy and restore ''every single timeline in the multiverse''. When Vilgax used a Chronosapien time bomb attempting to do the former, No Watch Ben's Clockwork effortlessly reversed it on his first try.
* TimeStandsStill: As demonstrated in "Bengeance is Mine", he can slow down time while moving at normal speed, making him appear super-fast to observers. Ben didn't know he could do it at the time.
* TookALevelInBadass: In ''Ultimate Alien'', he was rarely useful in combat due to his slow speed and his lack of nonlethal options. ''Omniverse'' gives him a TimeStandsStill ability and the ability to selectively control the flow of time for whatever he shoots, making him a viable choice.
[[/folder]]

[[folder:Eatle]]
!!'''Eatle''' (UA-42)
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/eatleov_9557.png]]
->'''Voiced by:''' Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/EricBauza (''Omniverse'')

Eatle was sampled from an Oryctini from the planet Coleop Terra.
----
* AdorableAbomination: Specifically, his design in ''Omniverse''. He looks remarkably sweet for a humanoid beetle freak.
* BigCreepyCrawlies: Looks like a giant rhinoceros beetle. He looks even more like one in ''Omniverse''.
* ExtremeOmnivore: Much like Upchuck, he can eat everything, including metal and concrete.
%%* FourLeggedInsect
* HornAttack: His horn can either shoot energy beams after eating something, or just be used as a standard melee attack.
* MovesetClone: His powers aren't really different from Upchuck's; they consist mostly of eating non-organic materials to produce energy attacks from it. The only reason he isn't a SuspiciouslySimilarSubstitute is because Ben was still using Upchuck when he got him.
* SuperStrength: His physical strength is the main thing that distinguishes him from Upchuck. He's much more capable in a standard brawl, even holding his own against a Lucubra-fused Vilgax.
* ToughBeetles: Can easily break tough materials to then eat them and send enemies flying by ramming at them, also has high durability that allows him to withstand huge amounts of damage.
* TheWorfEffect: He doesn't get a chance to ''do'' anything in his first appearance before getting clobbered by an Ascalon-powered Vilgax. He is the only alien ever used by Ben to get this treatment and the first alien whose power wasn't revealed in his first appearance (the only others so far being {{Joke Character}}s from ''Omniverse'').
[[/folder]]

[[folder:Fasttrack]]
!!'''Fasttrack''' (UA-28)
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/fasttrack.png]]
->'''Voiced by:''' Creator/DeeBradleyBaker

Fasttrack was sampled from a Citrakayah from the planet Chalybeas.
----
* EarlyBirdCameo: His debut is a voiceless appearance in "Basic Training." He speaks for the first time in "A Knight to Remember".
* {{Expy}}: Between his powers and design, he's basically Franchise/TheFlash, but blue.
* LightningBruiser: He's stronger than [=XLR8=] physically, though [[DownplayedTrope not by much]]. He was, however, able to lift both Tack and Magister Hulka without losing any speed despite Hulka being quite a bit bigger than him.
* PutOnABus: He does not appear in ''Omniverse''. Notable in that two of the four aliens not to appear, Jetray and Chamalien, have other members of their species appear (or at least a half-member of their species in Jetray's case), while like Spitter, Fasttrack's species does not appear at all.
** For what it's worth, Fasttrack does get a little Easter egg in "Fastcat," who is apparently his Dimension 23 counterpart.
* MascotRacer: Was created as one for the video game ''Ben 10: Galactic Racing''.
* SuperSpeed: Much like [=XLR8=], though he appears to not be as fast and has less control of his speed. Not only was he unable to catch up to Dr. Animo's missile in time, but he had difficulty stopping once he'd reached top speed.
* SuspiciouslySimilarSubstitute: Of [=XLR8=], though [=XLR8=] takes back dominion in ''Omniverse'' after Fasttrack is PutOnABus.
* TooFastToStop: He has a hard time stopping if he runs fast enough.
[[/folder]]

[[folder:Juryrigg]]
!!'''Juryrigg''' (UA-48)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/juryrigg_ov.png]]

->Voiced by Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/BumperRobinson (''Omniverse'')

Juryrigg is the Omnitrix's DNA sample of a Planchaküle from the planet Aul-Turrhen.
----
* EvilCounterpart: Well, not evil, but he ''is'' a much more mischievous version of Grey Matter.
* GadgeteerGenius: When fixing things rather than breaking them. A good example was in ''Gone Fishing'', where he defeats a whole army of robot pirates of his own... by breaking several of them and using the pieces to build a new, more powerful version to fight the remaining ones. He also built Ben's motorcycle, the Tenn-Speed. [[spoiler:And reprogrammed the Forever Knights' Highbreed Pulse Generator to permanently mutate Will Harangue into an alien.]]
* GripingAboutGremlins: Basically an alien version of a Gremlin. ''Omniverse'' accentuates this by giving him an aviator suit.
* HeroicComedicSociopath: When in this form, Ben feels a natural compulsion to destroy any non-damaged machine or device that is around him (the first time he used it, he ended up wrecking Kevin's car [[RunningGag again]]). When used right, however, he can actually prove useful by repairing or modifying the machines.
* TheImp: He's less than a foot tall, and was more of a nuisance than an assistance in his first couple of appearances.
* MovesetClone: A {{downplayed|Trope}} one of Grey Matter; both are small {{Gadgeteer Genius}}es that can build complex machines out of scraps, but Grey Matter is slower and more tactical while Juryrigg is faster and more unpredictable. Juryrigg's personality is also much wilder.
* MrFixit: While initially only able to take machinery apart, he figured out how to fix things by the end of his first appearance.
* SuperStrength[=/=]SuperSpeed: Specifically when it comes to breaking and fixing machinery. If they're part of a machine, not even Appoplexian-proof metal bars are safe from him.
* TheMindIsAPlaythingOfTheBody: Juryrigg is one of Ben's most uncontrollable aliens, and he often succumbs to Juryrigg's raw instinct of dismantling things.
* VerbalTic: He has a habit of repeating the last word he says multiple times to emphasize his excitable nature. If he doesn't have anything else to say he'll just belt out "Fix, fix, fix!" He also has a habit of cackling.
* WalkingTechbane[=/=]WalkingTechfix: Yes, both. If Ben isn't controlling Juryrigg's instincts, he'll destroy every machine in sight. If he is, he can fix them just as easily.
[[/folder]]

[[folder:NRG]]
!!'''NRG''' (UA-16)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/nrg_ov.png]]
[[caption-width-right:350:[[labelnote:Click here to see his true form]]\\
https://static.tvtropes.org/pmwiki/pub/images/NRG_True_Form_8979.png[[/labelnote]]]]

->Voiced by Creator/DeeBradleyBaker

The third of the Andromeda Five to be acquired by Ben. NRG was sampled from alien criminal P'andor, a Prypiatosian-B, who was actually a radioactive {{Energy Being|s}} trapped inside a PoweredArmor to prevent his radiation from killing those around him. While in the armor, NRG can produce intense heat and shoot energy beams from his visor, but, if the armor is opened, he can unleash his real powers, which include radiation, flight, heat beams, and the ability to ''feed'' on radioactive sources.
----
* AtomicSuperpower: NRG is a being of living radioactive energy. He wears a lead containment suit and can fire blasts of energy at will. NRG is also very hot himself, and not a form Ben can use for very long without exposing his friends to dangerous levels of radiation.
* ContainmentClothing: His suit is artificially created by the Omnitrix to protect others from his radiation. In ''Omniverse'', the outfit he wears in his true form also does this for a short period of time.
* EnergyBeings: What he really is inside of his suit. And a ''radioactive'' one, to boot, which is why he only sparingly exits it.
* EyeBeams: Since his three eye slits are the only openings in his suit, his energy blasts usually manifest this way.
* FantasticLightSource: His true form, being an {{Energy Being|s}}, can cast a glow powerful enough to badly injure [[WeakenedByTheLight Zs'Skayr]].
* FlyingFirepower: When you get him out of the armor, he can use his status an an {{Energy Being|s}} to defy gravity.
* HuskyRusskie: He expresses himself in a Russian-like accent and appears rather bulky thanks to his suit. However, he's rather lean underneath.
* ILoveNuclearPower: The reason he wears the suit; his real form is a radioactive energy being that is harmful to humans by his mere presence.
* MagmaMan: He can generate huge lava eruptions by channeling his energy into the ground.
* MadeOfIndestructium: NRG's armor, just like P'andor, is basically indestructible. Unlike P'andor, however, the helmet on NRG's armor has a handle instead of being sealed shut, making it easy for Ben to open the suit at will.
* MightyGlacier: He's this while inside of his suit. His armor is very strong and ''extremely'' tough, but also heavy and slow.
* PoweredArmor: Doubles as ContainmentClothing, that contains NRG and keeps his radiation from harming others.
* SealedGoodInACan: Because of the dangerous radiation he emits, his powerful true form is sealed inside of his suit. He can easily open it in ''Omniverse'' thanks to the handle on the top, though he doesn't do this unless he has to.
* ShedArmorGainSpeed: When in the containment suit, NRG is slow but has enhanced strength and endurance. It also protects him from enemies like the Lucabra's mind control. Out of the suit NRG is able to fly, is much more nimble, and generates light that makes him well suited to fight enemies like Ghostfreak. His different forms are each well suited for various types of enemies.
* SuperStrength: Courtesy of the armor. He was strong enough to easily throw a Vaxasaurian aside, albeit a rather wimpy one.
[[/folder]]

[[folder:Shocksquatch]]
!!'''Shocksquatch''' ([[WesternAnimation/Ben10GeneratorRexHeroesUnited Heroes United]])
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/shocksquatch_omniverse_official.png]]

->Voiced by Creator/DavidKaye

Shocksquatch was sampled from a Gimlinopithecus from the planet Pattersonea, and was accidentally unlocked by Ben in ''WesternAnimation/Ben10GeneratorRexHeroesUnited''; Shocksquatch is a Yeti-like alien with electrical powers.\\\

Ben 23's version is named ''Electricyeti''.
----
* BigfootSasquatchAndYeti: A yeti-like alien with electric abilities.
* CanadaEh: Speaks with this accent, eh?
* LightningBruiser: Pun aside, he's rather fast on his feet, and his combat prowess and electrical abilities make him a potent threat.
* ShockAndAwe: He can shoot electricity and electrically charge his punches.
* ShoutOut: Bears a striking resemblance to the rather infamous "pooh bear" uniform for the [[http://i.imgur.com/6DgDHek.jpg Boston Bruins]] ice hockey team.
* SuspiciouslySimilarSubstitute: He largely has the same abilities as Brainstorm, who was DemotedToExtra in ''Omniverse'', though he trades the SuperIntelligence for increased agility and strength. Later episodes of ''Omniverse'' show him replicating many of Brainstorm's powers, such as [[DeflectorShields force fields]] and [[MindOverMatter telekinesis]].
* TheWorfEffect: Shocksquatch was frequently beaten in ''Omniverse'' episodes to show the power and danger of various foes. Even [[BadassNormal Fistrick]] was able to defeat him one-on-one while wearing insulated shoes.
%%* WrestlerInAllOfUs
* YouDontLookLikeYou: In ''[[WesternAnimation/Ben10GeneratorRexHeroesUnited Heroes United]]'', he looks like a fairly normal-looking [[http://images.wikia.com/ben10/images/8/80/Screenshot2011-11-25at83224PM.png yeti]]. In ''Omniverse'', he looks [[http://images.wikia.com/ben10/images/5/50/ShocksquatchAlien.jpg far more]] like a typical [[ShockAndAwe electric]] character, to the point he resembles a simian [[Franchise/SpiderMan Electro]].
[[/folder]]

[[folder:Terraspin]]
!!'''Terraspin''' (UA-12)
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/640px-Terraspin_001_6482.png]]

->Voiced by Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/BumperRobinson (''Omniverse'')

The second of the Andromeda Five obtained by Ben. Terraspin was obtained from Galapagus, a Geochelone Aerio from Aldabra. Geochelone Aerio are peaceful, innocent turtle-like creatures who live in harmony with nature. They possess the ability to project powerful wind through their shell, allowing them to fly.
----
* AntiMagic: The whole species is immune to mana, though [[ForgotAboutHisPowers Ben never takes advantage of this when facing mana-wielding enemies]], not even when traveling through a realm made of mana and fighting enemies whose only weapon is mana.
* BlowYouAway: While he doesn't truly control the air, all of his powers are wind-based. He can fly, shoot wind blasts, generate tornadoes, and create a powerful vacuum force.
* {{Flight}}: He can fly like a helicopter.
* FlyingFirepower: Sort of a literal example, if you consider the fact he can use the same power for both flying and offense.
* SpectacularSpinning: How he generates his wind attacks and how he flies. He can also use this ability to dismantle robots by holding them down and spinning.
* SturdyAndSteadyTurtles: Subverted. Terraspin's large turtle body may make him look slow, but his SpectacularSpinning and flight powers actually make him fairly quick.
* SuperStrength: Strong enough to pick up and throw cars.
* TornadoMove: His typical attack is to generate powerful tornadoes.
* TurtlePower: His name is a pun on terrapin, a term used to describe several species of brackish or freshwater turtles. His turtle physiology also gives him a durable shell.
[[/folder]]

[[folder:Water Hazard]]
!!'''Water Hazard''' (UA-06)
[[quoteright:310:https://static.tvtropes.org/pmwiki/pub/images/pose_of_water_hazard.png]]

->Voiced by Creator/DeeBradleyBaker

The first of the Andromeda Five obtained by Ben; Water Hazard was sampled from Bivalvan, an Orishan. Orishans have tough exoskeletons that make them nearly invulnerable and have the ability to control water.\\\

Ben 23's version is named ''Hose Hands''.
----
* CoolHelmet: His ''Omniverse'' design gives him a retractable visor similar to [=XLR8=].
* JackOfAllStats: Amongst the Andromeda Five; he is resilient, but not as much as NRG's armor, fast but can't fly like Terraspin or [=AmpFibian=], strong but weaker than Armodrillo, and possesses long-range attack but not as powerful as NRG's or as versatile as [=AmpFibian=].
* MakingASplash: Can shoot water, absorb it, and such.
* NighInvulnerability: Not Ben's most resilient alien, but his exoskeleton still offers him quite an impressive durability.
* SuperNotDrowningSkills: Bivalvan was once seen going underwater without drowning. Water Hazard never was used the same way, but it's assumed he can as well.
* VocalEvolution: In his debut appearance, Water Hazard sounded exactly like Bivalvan, his genetic source. In later episodes, his voice takes on a deeper tone to set him apart.
* WhipItGood: Water Hazard can form his water blasts into whips.
[[/folder]]

!!''Omniverse'' Aliens

[[folder:Astrodactyl]]
!!'''Astrodactyl''' (OV-28)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/astrodactyl.png]]

->Voiced by Creator/DeeBradleyBaker

Astrodactyl was sampled from an unknown species (which WordOfGod states to be a "Pturbosaurian") from the planet Terradino, the same planet that Humungousaur's species is from.
----
* BatmanCanBreatheInSpace: When Ben was ejected out of Rad's ship in "The Vampire Strikes Back," Astrodactyl was able to fly into space after it.
* BreathWeapon: He can fire energy beams out of his beak.
* FlyingFirepower: Literally; His jetpack's propulsion can be used for [[WeaponizedExhaust attack purposes]].
* EnergyWeapon: He can manifest a powerful green star energy into numerous forms, such as beams, whips, and propulsion blasts.
* PteroSoarer: He looks like a vaguely humanoid pterosaur, and even comes from the same planet as fellow dinosaur alien Humungousaur.
* StarPower: His energy attacks are formed by some kind of internalized star power, that he can use as propulsion and different forms of weapons.
* SuperSpeed: He's incredibly fast, due to both his wings and the jetpack strapped to his back.
* SpotlightStealingSquad: He is Ben's main flight alien in ''Omniverse'', making him one of the most frequently used.
* SuspiciouslySimilarSubstitute: He serves as one to Jetray, being a flying speed alien whose powers include traveling through space and firing energy beams.
* VerbalTic: He squawks like a parrot frequently when he talks.
* WeaponizedExhaust: Which fires a disc of energy capable of stunning.
* WhipItGood: His main weapon is a pair is wrist-mounted energy whips.
[[/folder]]

[[folder:Atomix]]
!!'''Atomix''' (OV-39)
[[quoteright:271:https://static.tvtropes.org/pmwiki/pub/images/omniverseatomix.png]]

->Voiced by Creator/JohnDiMaggio

A robot-like alien of an unknown species. He is Ben's most powerful ''practical'' transformation, second in raw power only to Alien X.
----
* AscendedExtra: Like Toepick, he was briefly mentioned back in the original series episode, "Ken 10." Ken was disappointed that he was not one of the aliens on his Omnitrix. He then became a fully present alien in ''Omniverse''.
* AtomicSuperpower: Atomix can create or manipulate atomic or nuclear energy using his hands. It's as dangerous as it sounds, powerful to the point of being a StoryBreakerPower.
* CallingYourAttacks: Like a few other aliens, Atomix gives names to some of his attacks. These include "Fissile Whistle" (a flying punch), "Nuclear Winner" (a devastating nuclear explosion), and "Fusion Cuisine" (a miniature sun).
* {{Expy}}: Between [[CallingYourAttacks calling his attacks]], enormous levels of power, and KamehameHadouken energy blasts, he's one of [[Characters/DragonBallSonGoku Goku]], and anime characters in general.
* FlyingBrick: He can fly with what appear to be natural rocket boots.
* InformedAbility: He's meant to be Ben's second most powerful alien (behind [[RealityWarper Alien X]]), as Vilgax defeating him in "Malgax Attacks" was made to show the former was unbeatable without Skurd's help. But while [[OneHitKill one-shotting Albedo's]] [[SuperMode Ultimate Aliens]] is extremely impressive, there have still been several other aliens that have demonstrated even more powerful feats than Atomix [[note]]Specifically, Way Big overpowered the planet-busting Incursean Conquest Ray and has successfully defeated an enhanced version of Vilgax, Gravattack was able to catch a beast made out of time and create a black hole, Upchuck ate an energy source said to be more powerful than the sun, Goop held a planet together, and Feedback was able to catch and briefly absorb the Big Bang[[/note]]. In addition, his only other outright victory was against opponents who were already [[WeakenedByTheLight weak to light]] and [[ElementalRockPaperScissors at a disadvantage]]. Even in the fight against Malgax, Atomix wasn't shown to be doing anything noteworthy, with his attacks having [[NoSell no effect]] and Whampire being shown to put up just as much of a fight, if not more.
* KamehameHadouken: His main attack. He even chants "HAA-MEE-NA HAA-MEE-NA HAA-MEE-NA!" while forming them.
* KirbyDots: The transparent openings on his body show he's full of them.
* LargeHam: Rivals Rath as Ben's hammiest alien yet. Few of his lines are uttered without shouting in a ridiculously over-the-top manner.
* {{Mecha}}: Between his robotic body, strength, and powers, he's basically a giant nuclear robot.
* NighInvulnerable: He completely [[NoSell No-Sells]] direct hits from Albedo's Ultimate Aliens. Even when he's hit by TheWorfEffect in "Malgax Attacks," he tanks getting ''punched into orbit'' and only takes minor damage.
* ShoutOut: A strange one, too, as his "HAA-MEE-NA HAA-MEE-NA HAA-MEE-NA!" power-up chant is a reference to one of the catchphrases of [[Series/TheHoneymooners Ralph Kramden]].
* StoryBreakerPower:
** Being second only to Alien X in power, this is a given. Despite being his most powerful practical transformation, using Atomix would be just as overkill as using Way Big.
** Both the Duel of the Duplicates and Galactic Monsters story arcs are wrapped up effortlessly just by having Ben turn into this guy.
** Averted in "Malgax Attacks", where he is [[TheWorfEffect unable to defeat the Malware-powered Vilgax]].
* SuperStrength: Able to take out Albedo's recreated ''Ultimate'' Humungousaur ...with a single punch!
* ThePowerOfTheSun: Creates a miniature sun, which kills Zs'Skayr. It also stays in place even after Ben changes back. He leaves it in Zs'Skayr's lab so that even after Zs'Skayr comes back, he won't be able to get in.
* TheWorfEffect: He is defeated by the Malware-powered Vilgax in "Malgax Attacks" in order to make the argument that Ben needs Skurd's abilities more convincing.
* WorldsStrongestMan: Ben's most powerful practical alien, and the second most powerful overall being just behind Alien X.
[[/folder]]

[[folder:Ball Weevil]]
!!'''Ball Weevil''' (OV-09)
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/ball_weevil.png]]

->Voiced by Creator/BumperRobinson

Ball Weevil (alternatively spelled as Ballweevil) is the Omnitrix's DNA sample of an unnamed species from an unknown planet.
----
* BadassAdorable: Despite being one of Ben's smallest, cutest aliens, he can still put up a fight with his plasma balls.
* BigCreepyCrawlies: Downplayed. Compared to Ben's other insect aliens, he's rather small, though [[PintsizedPowerhouse he's still fairly powerful]].
* BigBulkyBomb: Ball Weevil's sticky balls grow very large very quickly as they collect more material. Naturally, the larger the ball, the larger the explosion.
* EnergyAbsorption: In addition to matter, Ball Weevil's plasma balls can absorb energy.
* FourLeggedInsect: He has the appearance of one.
* GlassCannon: His sticky balls do a lot of damage, but he's still small and fragile.
* MadeOfExplodium: He spits out sticky balls of plasma that absorb things, and then uses them as ammo.
* RidiculouslyCuteCritter: By Ben's own admission. The first thing he remarked upon in his debut was his cuteness.
* ShoutOut: His design is inspired by ''Franchise/{{Pokemon}}'', according to WordOfGod. [[invoked]]
* SphereFactor: Can roll on top of the sticky balls he makes.
* StickyBomb: His signature ability is to create explosive balls of sticky plasma. In addition to exploding, he can use his plasma spit as a strong adhesive to trap enemies.
* WallCrawl: Being a bug-like creature, sticking to walls is one of his abilities.
[[/folder]]

[[folder:Bloxx]]
!!'''Bloxx''' (OV-01)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/bloxx.png]]

->Voiced by Creator/BumperRobinson

The first new alien unlocked in ''Omniverse''. Bloxx was sampled from a Segmentasapien from Polyominus, a species that evolved to easily hide themselves amongst the structures of their home planet. As a result, their body is entirely made of [[BuiltWithLego LEGO-like bricks]] that can reconfigure and stretch themselves, giving them shapeshifting abilities.\\\

Ben 23's version is named ''Build-A-Guy''.
----
* AgonyOfTheFeet: Referencing the meme about LEGO and feet, Ben manages to trip up Khyber, who is currently in the form of a giant monster, by firing a pile of Bloxx pieces at his feet during "Stuck On You", causing Khyber immense pain so he falls over.
* ArmCannon: He can shapeshift his arms into cannons that use [[AbnormalAmmo his own bricks as ammunition]].
* BackForTheFinale: ''Omniverse'' Ben brings Bloxx with him for the Reboot's finale episode.
* BuiltWithLego: An alien gorilla made entirely of colorful, rearrangeable bricks.
* DetachmentCombat: By the means of using the bricks that make up his body as projectiles.
* HalfTheManHeUsedToBe: He detached the top half of his body in "Arrested Development." Thanks to his HealingFactor, this wasn't much of a problem.
* HealingFactor: He can regenerate from nearly any injury. As early as his debut, his head could be blasted to pieces and instantly reform.
* MadeOfPlasticine: He kind of needs his HealingFactor when his body shatters so easily.
* OurMonstersAreWeird: Again, he's a gorilla ''made from living LEGO bricks''.
* RollingAttack: While fighting the Dimension 12 robots, he curled up into a ball and smashed into them in a similar manner to Cannonbolt.
* RubberMan: His shapeshifting powers are extraordinarily flexible, being able to turn into domes, walls, catapults, and just about anything he can imagine.
* ShoutOut:
** Between his design and color scheme, he's a pretty obvious one to Franchise/{{LEGO}}.
** He's also similar to [=GutsMan.EXE=] from ''VideoGame/MegaManBattleNetwork'' in terms of design.
* StoneWall: He's almost used entirely for defense, though he has utilized his super strength on occasion.
* SuperStrength: He's strong enough to tear the heads off of Dimension 12 robots with his bare hands.
* VoluntaryShapeshifting: He's basically ComicBook/PlasticMan made out of LEGO bricks.
* WhoNeedsTheirWholeBody: Bisection didn't slow him down one bit.
[[/folder]]

[[folder:Bullfrag]]
!!'''Bullfrag''' (OV-27)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/65b61b31_f860_4f24_8948_4ec194d16f19.png]]

->Voiced by Creator/JohnDiMaggio

Bullfrag is the Omnitrix's DNA sample of an Incursean from an unknown and destroyed planet.
----
* AttractiveBentSpecies: To Attea, and it's not hard to see why if you compare him to the other male Incurseans shown.
%%* BadassBaritone
* BadassBoast: Towards Vilgax's squid monsters.
-->'''Ben'''[=/=]'''Bullfrag''': That all you got? I got snot made of stronger stuff than you! (''punches'') Don't feel bad. My snot is tough as the rest of me!
* BeautyEqualsGoodness: Even before TheReveal, you could tell he wasn't evil based on how tall, muscular, and less warty he was compared to other Incurseans (save Princess Attea). He's basically a yellow-green [[WesternAnimation/ToyStory Buzz Lightyear]] with no nose and three fingers per hand. According to WordOfGod, this is because [[https://web.archive.org/web/20170805050054/http://ben10.englishboard.net:80/t130p480-qa-with-matt-wayne Bullfrag is a genetically optimal specimen of his species, and most Incurseans have very poor diets]]. [[invoked]]
* TheCharmer: Out of all of Ben’s alien transformations, he is by far the ''smoothest''. All it took was a little sweet talking for him to turn the "naturally cold-blooded" Attea into a blushing, stuttering mess.
* CoolShades: Of the [[TriangleShades triangle]] variety. He originally wore them to hide his green eyes, [[https://archive.ph/JcKBR but the crew liked them, so they decided to keep them in his normal outfit]].
* DatingCatwoman: Due to the influence of Bullfrag's DNA, Ben is outspokenly attracted to Attea in this form... and the feeling is mutual.
* TheMole: Ben [[ShapeShifterModeLock mode locks]] himself as Bullfrag in order to infiltrate the Incursean army as part of his plan to retake Earth.
* InASingleBound: Being a frog, he can jump incredibly high. Not quite as high as Crashhopper, but he exchanges that for a MultipurposeTongue and greater hand-to-hand combat skills.
* LanternJawOfJustice: He has one, contrasting against other Incurseans, who have more rounded jaws.
* LightningBruiser: He's strong, very agile, and skilled in hand-to-hand combat. He was able to easily beat Attea in his debut appearance, who had previously defeated Spidermonkey and fought on par with Kickin Hawk.
* MultipurposeTongue[=/=]OverlyLongTongue: His frog physiology gives him a long, durable tongue that can be used to grab objects or as a makeshift grappling hook.
* NonStandardCharacterDesign: See BeautyEqualsGoodness above. He's the most obvious proof that Omnitrix aliens are the strongest, healthiest versions of their respective species.
* PaperThinDisguise: Subverted. While his Omnitrix Symbol should be a HUGE giveaway, his suit was temporarily modified such that the symbol is hidden underneath similar to Big Chill when cloaked by his wings. His green eyes would also be a giveaway, but they're covered by the sunglasses.
* RapidAging: Incursians physically develop much faster than humans, making him look far older.
* ShoutOut: His voice and mannerisms are similar to Creator/SylvesterStallone.
* TheReveal: An Incursean traitor who saves Kevin, Gwen, and Blukic from Attea's trap and helps them rescue Max and Driba? It's Ben.
[[/folder]]

[[folder:Crashhopper]]
!!'''Crashhopper''' (OV-06)
[[quoteright:239:https://static.tvtropes.org/pmwiki/pub/images/crashhopper.png]]

->Voiced by Creator/DeeBradleyBaker

Crashhopper is the Omnitrix's DNA sample of an Orthopterran from an unknown planet.
----
* BigCreepyCrawlies: He is an alien giant anthropomorphic grasshopper.
* ButtMonkey: A lot of his first episodes have Ben getting bad stuff happening to him while in this form: He accidentally encased his head in rock when first testing his powers, is the first alien Khyber's pet confronts using the right predator, gets the crap beaten out of him by a Tetramand princess, mistaken for a locust by angry farmers, and the list goes on... he even had a ''voluntary'' example when Ben used himself as bait in this form to trap the Kraken. Sometimes, you just gotta wonder if Crashhopper's real power isn't to get the crap beaten out of him.
* InASingleBound: Much like grasshoppers, he can jump incredibly high. He combines this with UseYourHead to powerful effect.
* LightningBruiser: Crashhopper's incredible jumping abilities and tough exoskeleton make him a potent physical threat.
* ShockwaveStomp: He can generate powerful shockwaves upon landing.
* SpotlightStealingSquad: He is one of the most frequently used new aliens in ''Omniverse'', especially in the earlier seasons. This gets downplayed in the later ones.
* UseYourHead: His head is strong enough to destroy a small asteroid with one headbutt.
[[/folder]]

[[folder:Decagon Vreedle]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/decagon_vreedle_full_design.png]]

Decagon Vreedle is the Omnitrix's DNA sample of a Vreedle. [[NotMakingThisUpDisclaimer Yes, really.]]
----
* AllThereInTheManual: He never appeared in the show; his existence was revealed through Derrick J. Wyatt's Ask.fm account, and his design was later revealed during a [=GoFundMe=] campaign.
* BeautyEqualsGoodness: Decagon Vreedle is significantly more handsome than the rest of the Vreedle family members.
* BodyBackupDrive: Like the Vreedle Brothers, he has this power. If he were ever killed, his memories would be transferred into a clone.
* DemolitionsExpert: When asked about his powers, Derrick J. Wyatt [[https://ask.fm/DerrickJWyatt/answers/121285311604 replied]] that "he would blow stuff up [[{{Catchphrase}} REAL good]]."
* TheGhost: Apparently, Ben isn't even aware the Omnitrix ''has'' a Vreedle form [[https://ask.fm/DerrickJWyatt/answer/121287464052 and would be horrified to learn]].
* MeaningfulName: A decagon is a ''10''-sided regular polygon. Fitting for Ben 10.
* ShoutOut: His design is based on ComicStrip/LilAbner.
[[/folder]]

[[folder:Feedback]]
!!'''Feedback''' (OV-01)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/feedback.png]]

->Voiced by Creator/YuriLowenthal

Feedback was sampled from a Conductoid from Teslavorr, a species of living electric cables with the ability to absorb and redirect energy. Unlike other aliens listed in this section, Feedback was first used when Ben was 11 years old, in the time between the original series and ''Alien Force''. He was one of Ben's favorite and most used aliens during this period of time. This was eventually abused by Malware to hurt Ben by destroying the form with his abilities (and couldn't be rescanned since Azmuth programmed the Omnitrix to not scan Conductoid DNA). Ben was left traumatized by the experience, to the point he actually attempted to kill Malware.\\\

Ben 23's version was named "Plug Man", but he changed it after hearing Ben's name.
----
* BackFromTheDead: He was (somehow) [[spoiler:brought back in "Showdown Part 2" when Ben finally forgives himself for what happened to the form]].
* BewareMyStingerTail: When Malware had him in a headlock, Feedback jabbed him from behind with his tail to break free.
* {{Cyclops}}: He's only got a single eye.
* ElectricSlide: Is shown running on power lines to catch up to the getaway car of two robbers in "Showdown: Part 1".
* EnergyAbsorption: He can absorb energy, and with seemingly no upper limit -- [[spoiler:not even the Big Bang was too much for him to handle]].
* EnergyWeapon: He can fire the energy he absorbs as beams.
* FamilyUnfriendlyDeath: [[spoiler: Malware pulls him out of the Omnitrix and he crumbles to dust]].
* {{Flight}}: He can fly by shooting energy at the ground.
* GRatedDrug: It's implied that he was this to Ben when he was younger. Ben became addicted to the form to the point where Feedback was the only alien he ever wanted to use, prompting Azmuth himself to come and warn Ben about his overuse of the form. Ben even admitted years later that he never understood why he liked him so much.
-->'''Ben:''' He just felt different. Better. Like he was a part of me.
* {{Leitmotif}}: An electric guitar theme plays every time Ben transforms into him.
* LightningBruiser: Both literally and figuratively. He's pretty fast and agile, and he also packs quite a punch with his powerful electrical abilities.
* MyGreatestFailure: Ben considers [[spoiler:Feedback's death]] to be this, and swore to never think or speak of it ever again.
* PerpetualSmiler: He is rarely seen without a cocky grin on his face.
* RememberTheNewGuy: He is introduced in the flashbacks as Ben's favorite alien during the original series' era when he was 11, despite never even being mentioned before. {{Justified|Trope}} in that the original series ended when Ben was still 10, and Ben swore to never think about him again after [[spoiler:his death]].
* ShockAndAwe: The latest in a long line of electrokinetic aliens, and without a doubt the most powerful. He's the one who ends up defeating both the first and final {{Big Bad}}s in ''Omniverse''.
* SpotlightStealingSquad:
** {{Invoked|Trope}}. 11-year-old Ben was quite fond of this alien, using him constantly in the time between the original series and ''Alien Force'', even when other aliens would have been a more logical choice. Lampshaded several times by Gwen:
--->'''Gwen:''' Don't you ever get tired of that alien?
** Deconstructed when it turned out using him too much might cause Ben to lose control over his other aliens. Then Malware took advantage of it and [[spoiler:destroyed the form]], devastating Ben.
** Averted with present Ben, as he's only used Feedback sparingly since he regained him. Ironically, in "Max's Monster," just when Feedback was needed the most, Ben had trouble trying to transform into him.
* StoryBreakerPower:
** His ability to absorb energy and fire it back often proves quite useful against Malware by reverting Malware's attacks. Malware eventually uses this to his advantage, [[spoiler:overloading Feedback with his own energy and disintegrating him.]]
** It's emphasized after his return that Feedback's absorption powers are virtually limitless; he absorbed enough energy from the Helix to easily overpower Malware's Tachyon Cannon, and he can easily drain the energy out of Terroranchula!Phil, an opponent who feeds on electric energy ''himself''. In the GrandFinale, he [[spoiler:absorbs the entire blast of the ''Big Bang'']].
* SuperSenses: Can smell radio waves, apparently via his antennae, as shown in "Clyde Five".
* SuspiciouslySimilarSubstitute: A downplayed one of Chromastone as both functioned as Ben's "energy absorption" aliens and both were also "killed" at one point in Ben's career, though Ben wasn't as devastated about Chromastone since he was busy fighting Vilgax.
[[/folder]]

[[folder:Gravattack]]
!!'''Gravattack/Ultimate Gravattack''' (OV-03)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/gravattack.png]]
[[caption-width-right:350:[[labelnote:Click here to see Ultimate Gravattack as used by Albedo]]\\
https://static.tvtropes.org/pmwiki/pub/images/ultimate_gravattack.png[[/labelnote]]]]

->Voiced by Creator/DavidKaye

Ben's second new alien to be unlocked in Omniverse. Sampled from a Galilean from planet Keplorr, Gravattack is a small [[GeniusLoci living planet]] with the ability to open itself in a more anthropomorphic form. He possesses his own orbit, which he has complete control over, granting him [[GravityMaster gravity powers]].\\\

Ben 23's version is named ''Orbit Man''.
----
* EvolutionPowerUp: Gravattack is the only alien form introduced in ''Omniverse'' to gain an ultimate form. In his evolved state, he becomes bigger, his gravity powers have completely phased out his legs, and his torso merges with his mouth. He also gains these three orbiting "moons" that resemble Koffing, Derrick J. Wyatt's favorite Pokemon.
* GeniusLoci: He may not be as big as an actual planet (though he is still quite tall), but he's been classified as a "living planet," hence his gravity powers. The sphere in his stomach represents the molten core of a planet.
* GentleGiant: While not really planet-sized, he is still bigger than Four Arms. According to Max in "Food Around the Corner," Galileans are well-known for being wise and patient.
* GravityMaster: As a living planet, he has his own orbit that he can manipulate at will, allowing him to control gravity. He can use it both manually, or go in planet mode and cause objects to gravitate around him.
* HoistByHisOwnPetard: Gravattack specializes in this by redirecting projectiles back at whoever fired them.
* LogicalWeakness: His powers of gravitational force makes him a potent threat to opponents, but this power is limited to weight only. As Albedo figured out, significantly changing one's individual shape and height, otherwise known as the amount of matter in an object, is enough to overwhelm Gravattack's orbit.
* MightyGlacier: In his standard form, he's bulky and not very fast on his feet, but is one of Ben's most powerful aliens.
* PowerFloats: When in planet form, he uses his gravitational field to float rather than roll.
* ShockwaveStomp: His size and weight allow him to pull this off.
* StoryBreakerPower: It's quite possible that he's not used terribly often due to the fact that his abilities amount to controlling gravity, which makes him much harder than most aliens to be defeated in a realistic fashion due to the fact that Ben could just make it hard for them to even move or launch them into space. "Food Around the Corner" required Ben to be Gravattack for most of the episode; said episode demonstrated that Gravattack's planetary core can be destabilized, resulting in a massive explosion, but this required flea-sized aliens to pull off and definitely isn't something that can be done on the fly. He also has a LogicalWeakness that if an opponent significantly increases their mass, they can throw off his orbit, but not many enemies can do this besides other Omnitrix users.
* ShoutOut: His Ultimate form is based on the Franchise/{{Pokemon}} Geodude with a pair of satellites resembling Koffing.
* SuperStrength: Expectable when you consider he is a vaguely human-sized anthropomorphic ''planet''. Even while still figuring out his powers, he was able to hold his own against Fistrick's mecha in his debut.
* VocalEvolution: In "Vilgax Must Croak," his voice is not as deep as it was in "A Jolt from the Past."
[[/folder]]

[[folder:Gutrot]]
!!'''Gutrot''' (OV-45)
[[quoteright:310:https://static.tvtropes.org/pmwiki/pub/images/gutrot_official.png]]

->Voiced by Creator/RobPaulsen

Gutrot was sampled from an unknown species. His innards are comprised mostly of gaseous chemicals, which he can combine into a virtually limitless array of compounds and unleash them in gaseous form from the vents on his body.
----
* AreaOfEffect: An actual limitation to his ability; when it can affect everyone around him, it includes his allies. Strong wind can also carry his gaseous chemicals away easily.
* ChemistryCanDoAnything: So long as Ben has a vague idea of what he needs to do, he can come up with a chemical compound that fits the situation.
* {{Fartillery}}: Given that he can generate and release any kind of gas he can imagine, this is essentially his power in a nutshell. When Animo first revealed what his powers were to Ben, the reactions from everyone around were... less than thrilled.
* FriendlyFireproof: Averted; he cannot will the chemical gases to not affect his allies in the process.
* InstantExpert: Instinctively knows how to form chemical compounds as necessary, including their names and specific effects. Points out that he has no idea how he knows this. This contrasts Chemistry normally being Ben's weaker subject.
* LoveIsInTheAir: He can produce a cloud of pheromones powerful enough to affect a To'kustar.
* PoisonousPerson: Through the ability to manufacture basically any chemical compound.
* ShoutOut: His appearance and powers are based off of [[Franchise/{{Pokemon}} Koffing]], Derrick J. Wyatt's favorite Pokémon. Much like Koffing, he's basically a living gas chamber that can expel gas attacks.
* StoryBreakerPower: Because ChemistryCanDoAnything, this form can defeat almost anything that breathes simply by spraying them with a gas to fit the current situation. He does to make sure said certain chemical compounds won't reach those he doesn't wish to affect, though (such as his allies).
* SuperIntelligence: A passive superpower. Along with chemical knowledge he casually discusses the implications of time loops and [[ConversationalTroping conversates]] about the reality of TapOnTheHead induced amnesia.
[[/folder]]

[[folder:Kickin Hawk]]
!!'''Kickin Hawk''' (OV-11)
[[quoteright:287:https://static.tvtropes.org/pmwiki/pub/images/kickin_hawk.png]]

->Voiced by Creator/YuriLowenthal

Kickin Hawk was sampled from Psyphon's alien henchman Liam during a confrontation in "Outbreak". A bird-like alien of unknown species, he possesses high physical abilities as well as a pair of [[BladeBelowTheShoulder natural blades on his two arms.]] Despite being of the same species as Liam, he looks very different from him. WordOfGod states that this is because the species has a very wide variety in plumage, and the king resembles a peacock.
----
* BladeBelowTheShoulder: Liam, another member of his species, is seen with these, and Kickin Hawk has them, too.
* EvilIsBigger: [[InvertedTrope Inverted]]; he is significantly taller and more muscular than Liam.
* GoodCounterpart: To Liam, a recurring {{Mook}} of the same species. In fact, Kickin Hawk was actually unlocked by Liam himself when he slammed down on the Omnitrix.
* HurricaneKick: In one episode, he was able to perform a breakdancing kick attack to repel Fistrick's army of Muroids.
* LightningBruiser: He's strong, fast, and remarkably agile. He's recognized as Ben's greatest hand-to-hand fighter, and was the only one that could put up even something of a fight against Rook's OldMaster Kundo.
* NobleBirdOfPrey: This hero form's name is a pun on "Chickenhawk", and he often screeches like a hawk, so he's likely intended to be one, rather than a chicken like Liam was.
* RoundhouseKick: His SignatureMove in battle, with his kicks being able to strike with the force of a cannonball. As he puts it, he's a "foot-to-head" fighter.
%%* UnderwearOfPower
* VocalEvolution: In “Collect This”, his voice has a higher pitch, making him sound more like Ben.
* WeakButSkilled: His strength is still superhuman, but compared to Four Arms, Rath, and Humungousaur, he relies less on brute strength and more on martial arts. In "Rook Tales," Ben even mentioned that Kickin' Hawk is his best hand-to-hand fighter.
* WrestlerInAllOfUs: Like Rath, he comes prepackaged with wrestling moves along with his martial arts.
[[/folder]]

[[folder:Mole-Stache]]
!!'''Mole-Stache''' (OV-11)
[[quoteright:266:https://static.tvtropes.org/pmwiki/pub/images/mole_stache.png]]

->Voiced by Creator/YuriLowenthal ("Outbreak") Creator/DavidKaye ("Breakpoint")

One of the multiple aliens revealed in "Outbreak". Mole-Stache is a mole-like alien of unknown species. Few things are known about him, though, according to Ben, he is rather useless.
----
* BewareTheSillyOnes: He's one of, if not the absolute silliest alien in Ben's entire arsenal, but he can lay down quite the smackdown to anyone who underestimates him. He even managed to beat ''[[ArchEnemy Vilgax]]'' with help from Skurd, albeit a younger version of him.
* CallASmeerpARabbit: Ben refers to his species as looking like moles, but they look more like woodchucks or beavers than actual moles.
* ElementalPunch: Skurd bestowed his 'stache with Maces made from Heatblast's body to give this effect.
* HelicopterHair: This is how he achieves flight.
* InformedFlaw: Ben still describes Mole-Stache as "unsatisfactory" despite proving to actually be quite useful in combat. It's never explained why he still thinks this.
* JokeCharacter: Initially introduced as useless. It takes him several seasons to finally figure out his powers, after which he becomes a LethalJokeCharacter.
* LethalJokeCharacter: Turns out his mustache packs a wallop.
* PrehensileHair: Can use his mustache to, among other things, fly and punch people.
* QuintessentialBritishGentleman: Speaks like this.
-->'''Mole-Stache:''' I say, Mole-Stache? This is quite unprecedented!
* ShapeshifterWeapon: So far we've seen his mustache shape itself into helicopter blades, a parachute, and fists.
* SuperStrength: His mustache is strong enough to briefly lift a truck, although it's clearly a struggle for him.
* UnexplainedAccent: Suddenly has a British accent in "Breakpoint".
* WouldntHitAGirl: From a scene in "No Honor Among Bros", [[http://tannertrue.tumblr.com/post/100050979277/as-promised-here-is-the-animatic-for-a-scene-that where he fought Yetta]], that was cut for time:
-->'''Mole-Stache:''' Now, ordinarily, I would never strike a lady, but I'm afraid you leave me no choice!
[[/folder]]

[[folder:Pesky Dust]]
!!'''Pesky Dust''' (OV-11)
[[quoteright:230:https://static.tvtropes.org/pmwiki/pub/images/pesky_dust.png]]

->Voiced by Creator/YuriLowenthal (Outbreak), Creator/TaraStrong

Another of the many aliens revealed in "Outbreak". Pesky Dust is a fairy-like alien called a Nemuina.\\\

Ben 23's version is named ''Nighty Knight''.
----
* DreamWalker: He can put people to sleep, then enter and manipulate their dreams.
* TheDreaded: To ''Khyber'' of all people, who immediately freaks out when Ben accidentally turns into him. Since he refers Pesky Dust's species by name, it's likely he knows about how their abilities can be used for interrogation.
* DudeLooksLikeALady: Ben is male, but the alien looks female.
* {{Expy}}: He's basically [[WesternAnimation/PeterPan Tinker Bell]] if she were an alien.
* {{Flight}}: He can fly with his butterfly wings.
* JokeCharacter: Initially introduced as useless, but later shown to have a lot of purposes.
* LethalJokeCharacter: Once he's revealed to have LotusEaterMachine ability. Ben 23 wonders how Ben could possibly have considered him useless.
* LotusEaterMachine: His power is a rare ''heroic'' example; he has the ability to put people to sleep, and then enter inside their dreams to manipulate them into revealing information.
* MeaningfulName: His species name, Nemuina, is based on the Japanese word for "sleepy" (眠いな/Nemui na).
* OurFairiesAreDifferent: Like most things in the show, he's of alien origin.
* ShoutOut: His powers are similar to Butterfree and Jigglypuff from the Franchise/{{Pokemon}} franchise. His butterfly design also gives him some resemblance to the former.
* TertiarySexualCharacteristics: {{Averted}}: he has long eyelashes, pink markings on his cheek and wings, wears a dress, and has a [[HeliumSpeech high-pitched shrilly voice]], but he's still a male.
* VerbalTic: Makes a trilling sound whenever he speaks.
* WingedHumanoid: He has butterfly wings that can fold up into a cloak, similar to Big Chill's moth wings.
[[/folder]]

[[folder:The Worst]]
!!'''The Worst''' (OV-11)
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/omniversetheworst.png]]

->Voiced by Creator/YuriLowenthal (Outbreak) Creator/DeeBradleyBaker (No Honor Among Bros)

The Worst is an Atrocian with a pair of green underwear with white stripes on it. He was unlocked in "Outbreak".
----
* AtrociousAlias: He's the only alien that Ben ''intentionally'' gave an unflattering name, out of frustration toward his general uselessness.
-->'''The Worst''': He's not ''like'' the worst. He ''is'' The Worst!
* BlessedWithSuck: He's indestructible, but can still feel pain.
* JokeCharacter: He can't really accomplish anything. If the name didn't make it obvious, he's Ben's least favorite transformation as of ''Omniverse''.
* HealingFactor: When Malice manages to punch a hole in him the wound promptly healed.
* NotCompletelyUseless: Once he's revealed to be indestructible. He still can't do anything offensively, but can survive just about any attack, which gives him some use in very specific situations.
* StoneWall: He has zero combat ability, but his species is pretty much indestructible. He's actually effective at tanking, as he took a three-hour beating from an Appoplexian with not a mark to show for it before the latter fainted from exhaustion. In "Most Dangerous Game Show", a female of the species struts across lava like it's nothing.
* TitleDrop: Ben said that this alien was "The Worst" as a comment.
* WhatKindOfLamePowerIsHeartAnyway: Being ''completely indestructible'' isn't usually this, but the fact that he's not immune to pain combined with his poor physical ability means there's really no reason to ever ''want'' to turn into The Worst. There are certain situations where he's NotCompletelyUseless, but essentially none where another alien couldn't do the same thing better.
[[/folder]]

[[folder:Toepick]]
!!'''Toepick''' (OV-20)
[[quoteright:309:https://static.tvtropes.org/pmwiki/pub/images/toepick_art.png]]

->Voiced by Creator/EricBauza

Toepick is the Omnitrix's DNA sample of an unknown species from an unknown planet.\\\

Ben 23's version is named ''Fright Face''.
----
* AcidAttack: He can supposedly shoot acid from his fingertips, [[InformedAbility but this has never been demonstrated on-screen]].
* AscendedExtra: Was briefly mentioned in the original series episode "Ken 10"; He was one of the aliens on Ken's Omnitrix, but Ken had Ben swap him out for Grey Matter, as Toepick was too disgusting for his taste. He finally makes an appearance in the episode "Special Delivery" in ''Omniverse''.
* BadPowersGoodPeople: Despite the gross, disturbing effects of his powers, he's used for good. For the same reason, though, he seems to largely be a last resort against threats Ben can't take down through other means.
* BrownNote: Just seeing his ''face'' inflicts either a terror response, madness, nausea, or all three on just about anyone who sees it. During his debut, he scares Psyphon so badly that the color ''actually drains out of him''.
* CreepyGood: He doesn't look scary at first, but the effect of people seeing his face is... disturbing. To better put it: Toepick's face scared the hell out of ''[[AxCrazy Psyphon]]''.
* TheDreaded: His literal power when he opens the cage on his head.
* HeartIsAnAwesomePower: Kenny was ''not'' fond of this alien. It was never explained exactly what he does, but Toepick was the one alien he couldn't even tolerate being in his Omnitrix. When he's finally shown for real in ''Omniverse'', it turns out his powers are actually extremely useful, if very unpleasant.
* InformedAbility: The trivia pop-up version of "Ken 10" said that Toepick could shoot acid from his fingers. He has not demonstrated such an ability in ''Omniverse''. This is because the staff of ''Omniverse'' didn't know this, so they invented a power, which is how the current Toepick came to be.
* LogicalWeakness: His horrifying face is useless against beings without sight or emotions.
* NightmareFace: One look at his face will immediately leave characters paralyzed or even sick with fear. It's never directly shown to the audience, but the characters' terrified reactions speak for themselves.
* NonIndicativeName: His abilities don't have anything to do with his toes. Instead, they're based vaguely off of the statement that Toepick grosses Kenny out.
* PleaseKeepYourHatOn: Like with NRG, the Omnitrix automatically supplies Toepick with additional gear to protect those around him: in his case, a mask covering his NightmareFace. It can be traumatic to others if he takes it off.
* ShoutOut[=/=]{{Expy}}: To Yukk from the obscure 80s Creator/HannaBarbera cartoon ''Mighty Man and Yukk''.
* StoryBreakerPower: All three times he has appeared, he saved the day by merely standing in front of the villain. One of them was an accidental transformation, and Ben didn't even seem to realize who he was. However, given the disgusting nature of his powers, Ben doesn't seem to use him much unless he has to.
* TakeOurWordForIt: His face is so hideous that it has to be hidden behind a cage-like mask. When it opens, it's so horrible that it isn't shown onscreen.
* VocalEvolution: In "Something Zombozo This Way Comes", he had a high-pitched voice. In "Cough It Up", he had a deep, [[VaderBreath wheezing]] voice.
[[/folder]]

[[folder:Ventrilosquid]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/ventrilosquid_no_background_1.png]]
* AllThereInTheManual: Just like Decagon Vreedle, his existence was revealed through WordOfGod and his design was later revealed during a [=GoFundMe=] campaign.
* TheGhost: According to Derrick J. Wyatt, [[https://ask.fm/DerrickJWyatt/answer/121379462772 he was one of the aliens Ben turned into off-screen in "Let's Do The Time War Again."]]
* {{Telepathy}}: His power is "sort of" this, according to Matt Wayne. According to Derrick J. Wyatt, it's just enough to implant thoughts and words into another's brain.
* {{Ventriloquism}}: As his name implies, this is his main power. He can imitate others' voices and make his voice appear to come from other places.
[[/folder]]

[[folder:Walkatrout]]
!!'''Walkatrout''' (OV-11)
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/Walkatrout_1893.png]]
->'''Voiced by:''' Creator/YuriLowenthal

Walkatrout was sampled from an Ickthyperambuloid. Ickthyperambuloids live on a planet with naturally occurring sidewalks. Their king walks briskly.\\\

They are also known as Walkatrouts, an inoffensive slang term.
----
* ADogNamedDog: His name is a slang term for his species. The name was first used by Driba in "Outbreak" and adopted by Ben in later episodes.
* JokeCharacter: He doesn't have any serious or practical use whatsoever. Every single appearance of his is purely used as a gag at his expense.
* TheLoad: Even ''The Worst'' has more utility than him. Walkatrout is the only one of Ben's aliens to never have accomplished a single thing onscreen; the ''one'' time Ben intentionally transformed into him was so he could [[ItMakesSenseInContext flush himself down the toilet]], and he couldn't even do that. Skurd had to use Four Arms's strength to force him down.
* SlipperySoap: His only "power" (besides having gills) is that his body is so slippery, no one can hold him.
* SuperNotDrowningSkills: Being a fish, he can breathe underwater.
[[/folder]]

[[folder:Whampire]]
!!'''Whampire''' (OV-48)
[[quoteright:196:https://static.tvtropes.org/pmwiki/pub/images/whampire.png]]
->'''Voiced by:''' Creator/JohnDiMaggio

Whampire is the Omnitrix's DNA sample of an extinct species called the Vladat, from Anur Vladias and Anur Transyl in the Anur System.\\\

Anur Vladias was a vast, spike-filled, rocky, honeycombed network of underground cathedral cave crypts. The caverns plunge so deep into the planet's crust that they are cut off from any light. All life was purged from the world during the Vladat's extermination by their former slave species. Now, Anur Vladias is itself an undead planet. No life can exist there, not even the hardiest life, not Celstialsapiens, not Ectonurites, not [[https://www.youtube.com/watch?v=rOT7gGEYQrg water bears]], not anything. So powerful is the undeath of the planet, merely being in its orbit will begin to drain the life force of the living.\\\

The DNA sample was acquired in extraordinary circumstances when Zs'Skayr brought the Vladat DNA source Lord Transyl back to life by using the power he stole from the Alpha Rune.\\\

Ben 23's version is named ''Bat-Dude''.
----
* {{Animorphism}}: He can transform into a bat.
* BadPowersGoodPeople[=/=]DarkIsNotEvil: It's still Ben, despite his MindControl and LifeDrain powers. He does have to resist the urge to use the latter, however.
* ComboPlatterPowers: Whampire can fly, have greater strength than average, creates sonic blasts, can mind control most life forms in the universe in ''two'' different ways, turn into a bat and a host of other tricks in a single versatile form. He just needs to avoid sunlight lest he explodes.
* {{Flight}}: He can fly in his natural form and while transformed into a bat.
* GoodCounterpart: To Lord Transyl. While Transyl embraces his HorrorHunger and seeks to conquer the universe, Whampire is able to restrain his natural desire to feed upon others, and acts as a hero.
* HorrorHunger: Like Lord Transyl, he has an intense desire to feed on other living beings. Immediately upon transforming, he attacked Hobble out of instinct. He even commented on this side-effect after swallowing a fly.
* HypnoticEyes: Can use this in conjunction with (or instead of) his Corrupturas.
* LastOfHisKind: Vladats were hunted into extinction by the Transylians before Azmuth started collecting DNA for the Omnitrix.
* LifeDrain[=/=]VampiricDraining: Like all Vladats, he can do this, though Ben tries to resist the urge to do so.
* LogicalWeakness: His Corrupturas won't work if they can't stick to an opponent's forehead. This provides several ways to avoid his mind control powers: phasing through them, blocking them, natural protection like the slimy mucus on Hobble's body, or wearing armor. Characters that could burn through them, such as a Pyronite, would also logically be immune.
* LooksLikeOrlok: Despite the overarching [[ClassicalMovieVampire Dracula theme]], he has no visible hair, long-clawed fingers, his mask resembles long pointed ears, and he doesn't have an OminousOperaCape. He seems to incorporate elements from both Dracula and Nosferatu.
* MakeMeWannaShout: He can produce a sonic blast powerful enough to launch an entire crowd off if he tries hard enough.
* MindControl: Like his genetic donor, he can create Corrupturas.
* ShoutOut: His status as a heroic vampire-like creature is reminiscent of ComicBook/{{Morbius}}. The wing flaps under his arms also resemble the ones in Morbius' classic costume.
* SuperStrength: Able to send a large mob of mind-controlled Anur Transyl denizens flying.
* StoryBreakerPower: His Corrupturas can take control over any alien except for other Vladats, allowing Whampire to end conflicts rather quickly. Unfortunately, if Whampire times out, then so do his Corrupturas.
* OurVampiresAreDifferent: An alien vampire.
* PunnyName: His name is a pun on [[VampireVords his accent]].
* VampireVords: Has a stereotypical Transylvanian/Hungarian accent to reflect his vampire basis.
* VeinOVision: Sees this way, at least when hungry
* WeakenedByTheLight: In "Blukic and Driba Go to Area 51", Ben accidentally transforms into Whampire, and nearly burns to death, running around in agony until Max taps the Omnitrix symbol, changing him into Four Arms.
[[/folder]]

!!Reboot Aliens
[[folder:Gax]]
!!'''Gax''' (RE-37)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/gax_0.png]]
->'''Voiced by:''' Creator/YuriLowenthal

Gax is the first new alien form of the reboot series seen that was not displayed before in any of the shows. Gax is the Omnitrix's DNA sample of a Chimera Sui Generis from the planet Vilgaxia. Yes, as in ''Vilgax's species''.
----
* AwesomeButImpractical: Ben's lack of restraint causes tons of collateral damage with both his SuperStrength and EyeBeams.
* CombatTentacles: His arms can unravel into multiple tentacles.
* {{Cthulhumanoid}}: His appearance as a Chimera Sui Generis.
* DrunkWithPower: Gax becomes an instant hit with Ben as soon as he sees how powerful he is. Given how Ben has historically favored Four Arms and Humungousaur, it's not a huge surprise.
* {{Expy}}: An overpowered alien with CombatTentacles that Ben falls in love with, but it gets destroyed from the Omnitrix? Almost reminds you of Feedback.
* EyeBeams: Has powerful eye beams that can ignite and outright vaporize objects and easily carve stone.
* KnightOfCerebus: His appearance in the series marks it taking a more dramatic turn.
* MythologyGag:
** His whole existence is one to when Ben got Blitzwolfer for the first time; he remarks how he should've let Vilgax touch the Omnitrix to obtain his DNA. ''Several'' years later (and in a new continuity), he finally can transform into a Chimera Sui Generis.
** When the Omnitrix changes Ben into Gax in midair, Ben wonders if Gax can fly. In ''Alien Force'', Vilgax could fly due to absorbing the power of heroes from the planets he conquered. It was also implicitly where he gained EyeBeams, but Gax possesses it naturally.
** Gax is also heavily based on Vilgax's original appearance before he got cybernetics, including his original coloration for his skin, head tube, and mace ball shoulder pads.
* NeverTheSelvesShallMeet: Non-TimeTravel example: When "Vil" touches the Omnitrix on Gax, it literally sucks the form off of Ben and Vil returns to his full glory as [[BigBad Vilgax]].
* RedEyesTakeWarning: Notable that, unlike other Omnitrix aliens, he does not have Ben's green eyes.
* SealedEvilInACan: Half of Vilgax sealed within the Omnitrix, although Gax himself isn't evil.
* SpikesOfVillainy: Although he ''himself'' is not evil, just his genetic source.
* SuperpoweredEvilSide: Downplayed; apparently aware enough to give Ben his name. Even though Ben has a notable PowerHigh using him he's just more reckless with him, not outright evil.
* SuperStrength: Manages to ''crack'' a mountain.
* SuperToughness: Appears to be as durable as Vilgax was in previous incarnations. He also has no difficulty fighting one of Animo's mutants [[ConvectionSchmonvection on an active lava flow]].
[[/folder]]

[[folder:Overflow]]
!!'''Overflow''' (RE-01)
[[quoteright:230:https://static.tvtropes.org/pmwiki/pub/images/overflow_re.png]]
->'''Voiced by:''' Creator/MaxMittelman

Overflow is the Omnitrix's DNA sample of a Cascan from the planet Cascareau. He replaces Ripjaws as one of Ben's original ten aliens for the reboot.
----
* AnIcePerson: In his Omni-Enhanced form.
* MakingASplash: He possesses hydrokinesis.
* NighInvulnerability: His exoskeleton is extremely durable.
* NotQuiteFlight: He can propel himself into the air by blasting the ground. For obvious reasons, this limits his flight ceiling.
* ShoulderCannon: A huge pair appear every time he uses the Omni-Enhanced form.
* SuperNotDrowningSkills: Can breathe underwater.
* SurprisinglyRealisticOutcome: His basic water blast is absolutely useless underwater in terms of offense, though it can propel him in any direction he pleases in short order.
* SuspiciouslySimilarSubstitute: He's basically Water Hazard, but with a new name and different species. Some WordOfGod bits suggest his and Water Hazard's species are related genetically.
* ThisLooksLikeAJobForAquaman: The reason for him replacing Ripjaws is likely to avoid this, as his set of powers allow him to be useful in more situations than Ripjaws. Ironically this makes him ill-suited for situations that Ripjaws excelled at, such as underwater combat.
[[/folder]]

[[folder:Shock Rock]]
!!'''Shock Rock''' (RE-49)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/latest_1_35.png]]
->'''Voiced by:''' Creator/DavidKaye

The second new alien form of the reboot series, a being of pure energy given structure through rocky armor plating. He is the Omnitrix's DNA sample of a Fulmini from the planet Fulmas.
----
* TheAce: So far in the Reboot, he has shown to be Ben's most powerful alien (with the exception of [[spoiler:[[EleventhHourRanger Way Big]]]]): not only he has strength and durability similar to Four Arms and Diamondhead, but can also absorb energy, create weapons and give a boost to the other Omnitrix's alien.
** In "The 11th Alien" ha was able to go toe to toe with Vilgax on his own, something none of Ben's other transformations could (not even when enhanced by Shock Rock himself).
* BadassCape: When the High Override took control of him, he gave Shock Rock one similar to his own.
* BattleBoomerang: He can use his powers to create a "Bluemerang" out of pure energy.
* BrainwashedAndCrazy: When the Fulmini hone in on Shock Rock's location, The High Override begins to communicate with Ben telepathically. This culminates in Ben as Shock Rock [[DarkestHour becoming his minion]], fighting Gwen and Max in his stead.
* ConservationOfNinjutsu: Shock Rock, a lone Fulmini on his own? Gives Vilgax the toughest fight he's ever had. A whole army of Fulmini? Vilgax knocks them down like bowling pins without effort.
* DiscardAndDraw: Even though he's billed as Ben's eleventh alien, he replaced Upgrade in the Omnitrix's loadout.
* TheDreaded: Vilgax is terrified when Ben activates the form, claiming Ben would not only destroy himself but the entire planet. Considering Shock Rock was able to defeat Vilgax, it's easy to see why Vilgax would want to dissuade Ben from using him. Later, it turns out Shock Rock ''himself'' wasn't the threat, it was that his existence was a beacon for the Fulmini empire which destroy planets to harvest their energy.
* EnergyAbsorption: He can absorb energy and fire it back at his opponents.
* EnergyBeings: Shock Rock is living electricity with rocky armor.
* EquippableAlly: Before becoming a form by himself, Shock Rock manifested as enhancements to Ben's other forms, granting them Shock Rock's powers in addition to their own.
* GoodColorsEvilColors: He is usually a bright, nice shade of blue. When the High Override controls him, he turns a slightly sick-looking shade of purple.
* PowerIncontinence: Subverted; at first it seemed like his powers were beyond Ben's control, but really it was Vilgax scheming with the Weatherheads to make him think that so he'd give up the Omnitrix.
* ShockAndAwe: He's made of electricity and can use it as a weapon.
* ShapeshifterWeapon: He eventually learns how to shapeshift his arm into a chainsaw.
* ShapingYourAttacks: He can shape his electricity, such as creating a "bluemerang" out of energy.
* UnwittingInstigatorOfDoom: Ben using Shock Rock and flaunting Fulmini energy with his "Omni-Enhanced" aliens allowed the rest of the Fulmini species to detect him and plan a full-scale invasion using the Omnitrix as a gateway.
[[/folder]]

[[folder:Slapback]]
!!'''Slapback''' (RE-81)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/latest_2_7.png]]
->'''Voiced by:''' Creator/ToddHaberkorn

A new alien Ben acquires in season 3. He is the Omnitrix's DNA sample of an Ekoplektoid from the planet Ekoplekton.
----
* AppropriatedAppellation: Gwen was the one who coined the name "Slapback". Ben didn't like it at first, but eventually, he grudgingly admitted how fitting it was, and accepted it as a name.
* AsteroidsMonster: His basic power set is that every time his back is struck he becomes two doubles who are half the size but twice the weight, strength, and durability.
* BigOlEyebrows: Which appear to be made of metal.
* MadeOfIron: He literally looks to be so and is quite durable. This only goes up the more he multiplies.
* PintSizedPowerhouse: At four copies he's basically a bunch of super-strong living cannonballs.
* SelfDuplication: Like Ditto and Echo Echo before him with the unique spin that the doubles get smaller but stronger, heavier, and more durable. This limits how many he can reasonably make but at the same time reduce the risk of copies being harmed.
[[/folder]]

[[folder:Surge]]
!!'''Surge''' (RE-173-176)
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/surge_2.PNG]]
->'''Voiced by:''' Creator/FredTatasciore

An alien unlocked by Ben in season 5 who's DNA comes from a hivemind species known as Xerge.
----
* BroughtToYouByTheLetterS: Is a member of the Xerge species, and his body is in the shape of an X.
* ChuckCunninghamSyndrome: Despite his DNA never explicitly being removed from the Omnitrix, he doesn't show up in Ben Gen 10 along with all the other aliens, one episode after his debut.
* HiveMind: The Xerge all share a collective consciousness when combined, with one being the dominant Xerge.
* TheLoad: Surge is practically useless on his own and needs other Xerge to do anything substantial in a fight.
* SynchronizedSwarming: The primary power of his species is configuring into basically anything when in groups.
* TronLines: Has these, similar to Upgrade.
* ZergRush: The second biggest strength of his species is unceasing attacks in endless swarms.

* SuperIntelligence: 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.

* GoodColorsEvilColors: Aside from the eyes and Ultimatrix symbol, in ''Omniverse'', Ben's Goop has a green body and Anti-Gravity Projector, while Albedo's is red.

* TheCharmer: Out of all of Ben’s alien transformations, he is by far the ''smoothest''. All it takes is a little sweet talking for him to turn the "naturally cold-blooded" Attea into a blushing, stuttering mess.

* TheCharmer: Out of all of Ben’s alien transformations, he is by far the ''smoothest''. All it takes is a little sweet talking for him to turn the normally cold-blooded Attea into a blushing, stuttering mess.

[[quoteright:166:https://static.tvtropes.org/pmwiki/pub/images/8f04be39_38ac_4b0a_916e_a6abeca0b2f6.jpeg]]

[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/bullfrag_8177.png]]

* CoolShades: Of the [[TriangleShades triangle]] variety. He originally wore them to hide his green eyes, [[http://www.formspring.me/DerrickJWyatt/q/437682229531928909 but the crew liked them, so they decided to keep them in his normal outfit]].

* WeaksauceWeakness: 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 LoadsAndLoadsOfCharacters, many of which can survive in and out of water.

* FragileSpeedster: Ben's fastest alien in ''Alien Force'' era and remains one of the fastest period, behind [=XLR8=] and Fasttrack. However, he isn’t very tough and goes down quite easily if he gets hit.

* FragileSpeedster: Ben's fastest alien in ''Alien Force'' era and remains one of the fastest period, behind [=XLR8=] and Fasttrack. However he isn’t very tough and goes down quite easy if he gets hit.

* SuspiciouslySimilarSubstitute: Jetray is practically one to Ripjaws in ''Alien Force''.

* EnergyBeing: What he really is inside of his suit. And a ''radioactive'' one, to boot, which is why he only sparingly exits it.

* FantasticLightSource: His true form, being an EnergyBeing, can cast a glow powerful enough to badly injure [[WeakenedByTheLight Zs'Skayr]].
* FlyingFirepower: When you get him out of the armor, he can use his status an an EnergyBeing to defy gravity.

The third of the Andromeda Five to be acquired by Ben. NRG was sampled from alien criminal P'andor, a Prypiatosian-B, who was actually a radioactive EnergyBeing trapped inside a PoweredArmor to prevent his radiation from killing those around him. While in the armor, NRG can produce intense heat and shoot energy beams from his visor, but, if the armor is opened, he can unleash his real powers, which include radiation, flight, heat beams, and the ability to ''feed'' on radioactive sources.

* ChuckCunninghamSyndrome: 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.

* ChuckCunninghamSyndrome: He was last used in "Ken 10", and present-day Ben was never seen using him.

* TookALevelInBadass: While he was already one of Ben's favorites in the original series when he returned in ''[[WesternAnimation/Ben10AlienForce 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''.

* KamehameHadoken: He can fire a powerful energy beam from his hands by putting them into a plus sign. In ''Omniverse'', this changes to an X formation.

* OmniscientDatabase: The Codon Stream, for the previous models. Since the Codon Stream and Primus have been erased from continuity, the Omnitrix in ''Omniverse'' doesn't rely on the Codon Stream, instead having all of the DNA stored within itself in a computerized form.

* VoluntaryShapeshifting is the power it grants Ben and the forms available for shifting [[SerialEscalation can escalate upwards forever]].
* YoungerThanTheyLook: Ben's transformations are the same age as him or at least an equivalent for that species.