History Characters / Ben10VillainsUltimateAlien

->'''Voiced by:'''Xander Berkeley

--> '''Prisoner 775:''' Do it! Do it! Please do it! Let me join my family! Please... I've got nothing...

* NoNameGive: 775's real name is never revealed.

* SitcomArchnemesis: When he is not building KillerRobot or secretly helping criminals, the worse things he does to Ben is insulting him on TV.

* StrawmanPolitical: Though a blender of several political pundits. (As one message board noted: he's like the worst of Bill O'Reilly, Keith Olbermann, Glenn Beck, Al Franken, and even Stephen Colbert mixed in a blender.)

A [[Creator/HPLovecraft Lovecraft-esque]] EldritchAbomination and DimensionLord who attempted to take over Earth during the Middle Age. His invasion was stopped by Sir George, who eventually took his heart apart, leaving him weakened, and sealed him away in his own dimension. George then created the Forever Knight to ensure the thing would never escape again. Unfortunately, following George's departure, the Forever Knight forgot their goal over time, and a faction of them ended up accidentally breaking the seal, partially freeing Dagon in the process. This, coupled with the intervention of a sect worshiping Dagon, eventually led to his imminent return as the major BigBad for season 3 of Ultimate Alien.

* RedEyesTakeWarning: Given his resemblance to Vilgax.

* EvilSoundsDeep: He’s got a very deep, gravelly, sinister voice courtesy of Creator/JohnDiMaggio.

* HornedHumanoid: Very small horns, but it still counts.

* NoShirtLongJacket

* RedEyesTakeWarning: [[spoiler:And he retains this colour as Ultimate Aggregor]].
* RubberForeheadAlien: In his default form he looks essentially like a human with a row of spikes on his head and [[RedEyesTakeWarning red eyes]]. [[spoiler:He IS human. Osmosians aren't really aliens; they're a human subspecies.]]

* BlatantLies: He tried save his reputation after the Incursean Invasion by pretending he was acting undercover to save Earth and was prevented from doing it by Ben. Nobody buys it. Not even [[MadScientist Chadwick]].

* WardensAreEvil: An amoral warden who uses Incarcecon for drug tarfficking and refuses to let the Plumbers find out.

* DirtyCoward: He used a device that activated sonic collars on prisoners, but become completely defenseless without it.

[[folder:Captain Nemesis]]
!Carl Nesmith (Captain Nemesis)
[[quoteright:309:https://static.tvtropes.org/pmwiki/pub/images/Overlord_1298.png]]
->'''Voiced by:''' Creator/ChristopherMcDonald

Originally a famous super-hero operating before Ben even got the Omnitrix, Captain Nemesis ended up causing a fake kidnapping attempt on young star actor Jennifer Nocturne, so he could save her and come back on the scene. After the kidnapping was stopped by Ben, he grew jealous of him, to the point he eventually offered a "friendly competition" between them to see who was the best hero. Ben ended up defeating him, causing Nemesis's jealousy to turn into a grudge, and he upgraded his armor to a dangerous level before attempting to get his revenge on him. He eventually lost all common sense and became a villain.

* FallenHero: he started out as a superhero, but ended up trying to cause fake kidnapping in order to get popular again, and eventually turned into a criminal due to his jealousy toward Ben. Both Ben and his Agent hinted he had been an actually great hero before.

* GodIsEvil: Galapagus actually invokes his name in a "Thank God" context, suggesting he is revered as a god by his people. However, WordOfGod states that no one knows that he became corrupt.

* AdaptationalBadass: In the original tale, he was slain by George, but here, even getting his heart cut out didn't kill him.

* SparedByTheAdaptation: In the original story, the Dragon was slain, but in this show's version of the story, he survived and was imprisoned.

* {{Hypocrite}}: Keeps calling Ben a menace on TV and denouncing [[DestructiveSavior the collateral damages he causes in his heroic acts]]. That coming from the guy who built a giant KillerRobot [[PickOnSomeoneYourOwnSize just to hunt down a 16 years old kid]], and pretty much caused as much, if not more, damage than Ben by doing so.

** This trope is finally avoided in "Return to Forever", which reveals that he lost viewers after "Frogs Of War" due to siding with the Incurseans, and then [[spoiler:[[KarmicTransformation gets permanently mutated into a tentacled alien hybrid]]]]. On top of this, in ''The End of an Era'', it's shown that Jimmy Jones is now a news reporter and Harangue is his cameraman, meaning he was booted off the desk.

* TheQuisling: Gladly sings the praises of the Incurseans when they exile Ben from Earth. [[KarmaHoudiniWarranty This is what finally turns the general public against him]].

'''Villains premiering in:''' [[Characters/Ben10VillainsOriginalSeries The Original Series]] ([[Characters/Ben10Vilgax Vilgax]]) | ''[[Characters/Ben10VillainsAlienForce Alien Force]]'' | '''''Ultimate Alien''''' | ''[[Characters/Ben10VillainsOmniverse Omniverse]]'' | [[Characters/Ben10VillainsSpecials The Specials]] | [[Characters/Ben10Villains2016Series The 2016 series]]\\

!!Forever Knights
[[folder:Sir George]]
!!George
[[quoteright:144:https://static.tvtropes.org/pmwiki/pub/images/c5cf8078bb1c11e1b8ad12313d1c2505_small_8360.jpg]]
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/4219451_9560.jpg]]
[[caption-width-right:320:Yes, this is the same guy.]]
->'''Voiced by:''' Peter Renaday

An enigmatic, immortal knight who is responsible for creating the Forever Knights in the Middle Ages. After being absent for centuries, George eventually comes back in ''Ultimate Alien'' to re-unite his order and ready them to fight an incoming threat, the EldritchAbomination Dagon. Though well-intentioned and extremely moral, George believes all aliens are monsters, and wants them banished from Earth or dead.

* AffablyEvil: Even when opposed to Ben and his team, he acts polite and respectful towards them. [[spoiler:When they fight together against Dagon and Ben is seemingly killed, George actually states he will ensure his death will be avenged.]]
* AntiHero: Type IV with shades of Type V.
* AntiVillain: Type III with shades of Type IV.
* ArchEnemy: To Dagon.
* BeethovenWasAnAlienSpy: [[spoiler:He is the same person the tale [[Myth/SaintGeorge Saint George and the Dragon]] speaks of.]]
* BigBadEnsemble: Shares the role with Vilgax and Dagon for most of season 2 in ''Ultimate Alien'' [[spoiler:until he makes a HeelFaceTurn and dies]].
* CoolOldGuy: Even before regaining his youth, he already was remarkably skilled in a fight.
* EvilVsEvil: He opposes his ArchEnemy Dagon, despite technically not that evil.
* FallenHero: Supposedly, as his past self seemed rather heroic in his actions. He might even not really be fallen.
* FamilyUnfriendlyDeath: [[spoiler:Dagon strikes him with lightning and electrocutes him to ''ash''.]]
* FantasticRacism: If it isn't a pureblooded Earth native, he wants it off-world or dead. However, if they're an enemy of Dagon, such as Ben and co., he'll work with them.
* AFatherToHisMen: George is deeply respected by his men and totally subverts all the BadBoss related tropes.
* FireForgedFriends: [[spoiler: George and Ben bond during their battle against Vilgax with him showing genuine concern for Ben's safety. Ben refers to him as a friend when confronting Vilgax.]]
* GoodVersusGood: Though he has KnightTemplar tendencies, he is still technically a good guy, so his opposition to Ben can be seen as this.
* HeelFaceTurn: [[spoiler:Debatably; at least he didn't mind Ben's team helping him fighting Dagon in the finale.]]
* HeroAntagonist: Really, FantasticRacism aside, he isn't such a bad guy.
* HeroOfAnotherStory: He did manage to defeat and seal away Dagon and save the Earth during Earth's darkest hour (the Medieval Ages). In a less tolerant time, he would have certainly been the ideal hero. Unfortunately in modern times, his prejudiced desire to purge aliens makes him a villain.
* HolierThanThou: He sees himself as this, but he's really just ALighterShadeOfBlack to the Forever Knights as a whole.
* {{Hypocrite}}: Doesn't like aliens living on his planet, even if they're just average people that do no harm. His legend was created when [[spoiler: an alien gave him the most powerful weapon ever created-that ''he'' created-without which George could never have beaten Dagon]].
* ImmortalityImmorality: Averted. Despite living for so long George holds tight to his ethics and founded an order to defend Earth from alien threats and Dagon in particular. If anything, [[WellIntentionedExtremist he has the]] [[KnightTemplar opposite problem]].
* ItsAllAboutMe: His goal is protecting humanity from Dagon which is noble enough in itself, but he seems to be convinced that only he can do it, cutting off the "alien" heroes and his own knights on occasion as he thinks [[TheOnlyOneAllowedToDefeatYou he's the only that can defeat Dagon]]. Of course, Ben feels the same way.
* KilledOffForReal: [[spoiler:Dagon kills him during the climax of ''Ultimate Enemy''.]]
* KnightOfCerebus: Responsible for making the Forever Knights formidable threats.
* KnightTemplar: He ''is'' well-intentioned, but he has strong racist anti-alien prejudices.
* ALighterShadeOfBlack: To Dagon. Downplayed, in that desite his prejudices he's not evil.
* NobleDemon: Despite being a xenophobic KnightTemplar, he actually does have a very strong sense of morals and honor.
* PublicDomainCharacter: He's [[spoiler:the titular St. George from the medieval legend of "St. George and the Dragon," with Dagon being the Dragon in question. In his initial appearance, the show even references the link by name, with the story itself being an example of DirectLineToTheAuthor.]]
* ReallySevenHundredYearsOld: [[spoiler:He was a Roman soldier in his first lifetime.]]
* RedemptionEqualsDeath: [[spoiler:He doesn't last long after joining forces with Ben and his team in the fight against Dagon.]]
* ShadowArchetype: To Ben. Both are humans who [[spoiler: use an AmplifierArtifact created by Azmuth]], have similar issues with trust from those they protect and possess rather high opinions of themselves. The key difference is that Ben doesn't see any difference between humans and aliens while George is a champion for humanity only. The similarities between the two even cause Ben to [[spoiler: allow George the chance to take on Dagon despite Azmuth's orders - but when he fails, Ben says he gets the sword of Ascalon to finish the job]].
* SuddenlyVoiced: He speaks for the first time in "The Purge".
* TakeUpMySword:[[spoiler:Ben takes up Ascalon after his death to defeat Vilgax.]]
* {{Telepathy}}: According to WordOfGod.
* TheVoiceless: He doesn't say a single word in his debut, nor in "Prisoner Number 775 is Missing".
* WellIntentionedExtremist: He really does want to protect humanity-whatever the cost.

[[folder:Forever King Urian]]
!!Urian
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/300px-urian_001_2463.png]]
->'''Voiced by:''' Jim Piddock

The leader of another Forever Knight separate faction.

* BadBoss: His EstablishingCharacterMoment has him electrocute one of his knights as a punishment for failure.
* DroppedABridgeOnHim: [[spoiler:Supposedly died at the same time as Patrick.]]
* PoweredArmor: His classic armor gives him enhanced strength and the ability to shoot electrical blasts. In ''Duped'', he shortly acquires a new, mecha-like alien armor.
* ShoutOut: To Myth/KingArthur's brother-in-law of the same name in some versions of the legend.
* SmugSnake: Extremely arrogant, but the one time he got confronted to Ben, he was defeated fairly easily as far as Forever Kings go.

!!The Esoterica
[[folder:General]]
!!The Esoterica
[[quoteright:349:https://static.tvtropes.org/pmwiki/pub/images/_circle_soldiers_8265.png]]

The Esoterica, also known as the Flame Keepers' Circle, are a group introduced in season 2 of ''Ultimate Alien''. Though they initially appear to be a philanthropic organization that believes in aliens helping humans to evolve, they actually are a {{cult}} worshipping Dagon, and intending to bring him back on Earth. The season 3 story arc focuses on a war between them and the Forever Knights.

* ChurchOfHappyology: Appear to be this at first, but [[NotSoHarmlessVillain there is more to them than meet the eyes]].
* ETGaveUsWiFi: They believe Dagon was a benevolent alien who provided technology to Humanity. He wasn't.
* EliteMooks: As far as mooks go, they are quite competent and dangerous on their own. They possess actual powers, know how to use them to their advantage, and are pretty skilled in a fight.
* EvilVersusEvil: Against the Forever Knights.
* FacelessMooks: They wear masks that give them this look.
* {{Foil}}: To the Forever Knights; both are ancient organizations of [[WellIntentionedExtremist Well-Intentioned Extremists]] related to Dagon with superstitious tendencies. However, the Knights were created to protect Earth from him and despise aliens and magic, whereas the Esoterica worship him and believe in having more contact with aliens.
* TheHeavy: Technically, they never were part of the BigBadEnsemble, since they kept working either for Dagon or [[spoiler:Vilgax]], but since Dagon didn't show up until the finale, they were the ones who acted the most for his side of the Ensemble.
* RedAndBlackAndEvilAllOver: With a bit of gold added to the mix.
* ReligionOfEvil: Though they don't appear to be aware of it.
* SuperPowerLottery:
** EnergyBall: Their main form of attack behind martial arts-like techniques.
** {{Teleportation}}: Through jumping between dimensions.
* UnwittingPawn: [[spoiler:To Vilgax, who they mistake for Dagon. Later, they truly followed Vilgax after he became Dagon.]]
* WellIntentionedExtremist: Many of them seem genuinely convinced that Dagon is going to make things better for humanity.

[[folder:Conduit Edward]]
!!Conduit Edward
[[quoteright:187:https://static.tvtropes.org/pmwiki/pub/images/300px-conduit_edwards_8355.png]]

The leader of the Esoterica cult.

* BitchInSheepsClothing: Initially introduced as a very nice, polite, well-intentioned businessman. Later revealed as a fanatic cult leader who has no problem threatening to trap Julie between two dimensions to get Ben to obey him.
* CorruptCorporateExecutive: Played with; he isn't seen doing anything technically criminal, but he is a wealthy businessman, and he ''does'' lead an evil cult trying to bring back an EldritchAbomination in our world.
* TheDragon: To Dagon.
* DyingCurse: [[spoiler:To George, after getting impaled on Ascalon.]]
-->[[spoiler:"May Dagon curse you."]]
* ImpaledWithExtremePrejudice: [[spoiler:How he meets his demise at the hands of George.]]
* InTheHood: His Esoterica attire.
* KilledOffForReal: [[spoiler:And ''on-screen'', at that.]]
* UndyingLoyalty: To Dagon. [[spoiler:Best shown when he ''actually dies.'']]

!!Independent Villains
[[folder:Will Harangue]]
!Will Harangue
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/will_harangue.png]]
[[caption-width-right:350:Click [[labelnote:here]]\\
https://static.tvtropes.org/pmwiki/pub/images/alien_harangue.png[[/labelnote]] to see him [[spoiler:as an Alien]]]]
->'''Voiced by:''' Creator/JohnDiMaggio

An anchorman who for unknown reasons developed a violent hatred of aliens after Ben's existence was revealed to the world in ''Ultimate Alien''. Harangue is convinced that aliens are a menace (especially Ben), and passes most of his time trying to convince everyone that he is right. Occasionally, he will also attempt things against Ben himself, but most of his appearances only have him criticizing Ben on TV.

* BlatantLies: He tried save his reputation after the Incursean Invasion by pretending he was acting undercover to save Earth and was prevented from doing it by Ben. Nobody buys it. Not even [[MadScientist Chadwick]].
* EvenEvilHasStandards: He seems to draw a line at mass alien genocide, if only because no spin doctor could make that go over well with the public.
* {{Expy}}: He's [[Franchise/SpiderMan J Jonah Jameson]] mixed with [[ComicBook/XMen Senator Kelly]] as a TV pundit.
* FantasticRacism: Against aliens. [[{{Hypocrite}} Though that doesn't stop him from siding with the Incursean during their invasion]].
* HateSink: There is nothing to like about this guy. He besmirches Ben and supports the Incursean Invasion in "The Frogs of War". [[spoiler:It's amusing to see him get splashed by Ben as Water Hazard (even though it was an accident) and get mutated into an alien in "Return to Forever".]]
* HumiliationConga: [[spoiler: Suffers this in "The Frogs of War". Due to supporting the Incurseans, he loses his viewers and by the time of "Return to Forever", he gets mutated into an alien.]]
* {{Hypocrite}}: Keeps calling Ben a menace on TV and denouncing [[DestructiveSavior the collateral damages he causes in his heroic acts]]. That coming from the guy who built a giant KillerRobot [[PickOnSomeoneYourOwnSize just to hunt down a 16 years old kid]], and pretty much caused as much, if not more, damage than Ben by doing so.
** He makes arguments against aliens in "Frogs of War", even citing Ben as a possible alien invader. The second part has him ''supporting and praising their new frog-like overlords'' for getting rid of Ben. The public didn't miss this one, though, and it cost him their support.
* IrrationalHatred: There is no stated reason as to why he hates aliens (especially Ben) so much. Though it is implied that he is racist against aliens partially for rating, partially just to be harsh.
* {{Jerkass}}: There are many other names for him, though ''nothing'' seems strong enough. He finally learns this ''the hard way'' [[spoiler:when Ben turns Harangue into an alien]].
* KarmaHoudini: Pretty much got off scot-free for his actions in "Computer Games", save for the billions he spent on the robot. [[AndThatsTerrible And his car]].
** This trope is finally avoided in "Return to Forever", which reveals that he lost viewers after "Frogs Of War" due to siding with the Incurseans, and then [[spoiler:[[KarmicTransformation gets permanently mutated into a tentacled alien hybrid]]]]. On top of this, in ''The End of an Era'', it's shown that Jimmy Jones is now a news reporter and Harangue is his cameraman, meaning he was booted off the desk.
* ManipulativeEditing: He resorts to this at times to paint Ben in a bad light. It's pretty blatant, but it convinces people anyway.
* MeaningfulName[=/=]PunnyName: He goes on long, critical and aggressive rants about Ben on a regular basis, so of course his last name means ''exactly that''.
* NeverMyFault: Spending the whole of ''Frogs of War'' vigorously [[TheQuisling kissing the Incursean invaders' jackboots]] has torpedoed his ratings. [[BlatantLies He insists that he was trying to undermine them before Ben ruined everything]], which no-one buys at all, and cannot understand why people think he's the bad guy.
* PayEvilUntoEvil: Ben finally gives this to him by shooting water at him as Water Hazard. With the randomizer function on and Ben creating accidental damage, what he did to Harangue was obviously not an accident, especially since Ben's response to this is a sarcastic-sounding "Oooops!". Ben does it again by [[spoiler:using Juryrigg to mess with the Forever Knights' machine to mutate Harangue into an alien]].
* TheQuisling: Gladly sings the praises of the Incurseans when they exile Ben from Earth. [[KarmaHoudiniWarranty This is what finally turns the general public against him]].
* {{Sadist}}: In that one of the reasons that he's racist against aliens is just to be harsh, apparently taking joy in his harshness.
* SitcomArchnemesis: When he is not building KillerRobot or secretly helping criminals, the worse things he does to Ben is insulting him on TV.
* ShutUpHannibal: Finally, in "Frogs of War" Ben does this to him as Water Hazard. He should've done something like this a long time ago.
* StrawmanPolitical: Though a blender of several political pundits. (As one message board noted: he's like the worst of Bill O'Reilly, Keith Olbermann, Glenn Beck, Al Franken, and even Stephen Colbert mixed in a blender.)
** ObfuscatingStupidity: A lot of the StrawmanPolitical pundit stuff is for show; behind the scenes, he's pretty sinister.
* VillainWithGoodPublicity: Zigzagged. Despite ''many'' problems in his smear campaign against Ben, he not only managed to somehow avoid being arrested by the feds, but also seems to still have enough of a following to keep his show. He finally lost it in "Return to Forever", because he supported the Incursean Armada. However, he got it back after being turned into an alien hybrid, if only because an alien anchorman is a novelty to the general public. Then his ManipulativeEditing was exposed, ruining his reputation once again.

[[folder:Addwaitya]]
!Addwaitya
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/14_105810721084_107510761077_108810861078107610721077109010891103_10841072107510801103_mkv_000964172_2811.jpg]]
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/adwaita_ov_4781.png]]
->'''Voiced by:''' Creator/JohnDiMaggio (''Ultimate Alien''), Creator/SteveBlum (''Omniverse'')

A villain introduced in "Where the Magic Happens", and the BigBad from Charmcaster's perspective. A Geochelone Aerio magic-user, Addwaitya was once a revered philosopher amongst his people, until he somehow ended up in the possession of the Alpha Rune, an artifact that granted him control over Magic itself. He used it to take over the dimension of Ledgerdomain, exterminating the civilization of human spellcasters who had been living here and enslaving the others. Hex and Charmcaster were the only known survivors thanks to the sacrifice of Charmcaster's father, Spellbinder.

* AboveGoodAndEvil: What he, and any possessor of the Alpha Rune, perceive themselves as due to their [[AGodAmI practical godhood]]. He doesn't care about helping or harming the universe, just about maintaining a tight grip on his dimension.
* AndIMustScream: [[spoiler:Charmcaster puts him in this situation after she overthrew him...twice, in fact, through two different methods. The second method ends up a subversion, as he's mostly kept in her magic bag where he is free to move around like normal.]]
* ArchEnemy: To Charmcaster.
* AssholeVictim: [[spoiler:Probably the only one of Charmcaster's victims that no one will miss. Though his life was returned to him afterwards.]]
* BigBrotherIsWatchingYou: He uses magical drone-like creatures to watch everything that happens in Ledgerdomain.
* BlowYouAway: Though he's never been shown using them, and despite lacking holes in his torso, WordOfGod states that he still has his specie's wind abilities.
* CharacterizationMarchesOn: His personality in ''Omniverse'' is much more sane and pragmatic. [[spoiler:He's [[EnemyMine willing to work with Gwen, Darkstar, and the reformed Hex]] to get out of Charmcaster's bag, manipulating Charmcaster with poisonous advice to eventually let him out, and is very blunt that he hasn't changed his ways about planning to rule Ledgerdomain.]] A lot of it is probably due to not having the Alpha Rune on-hand anymore, which has damaging effects on a person's sanity.
* DimensionLord: While he is never seen attempting to conquer ours, he does rule another dimension.
* {{Expy}}: A DimensionLord with a flaming head... looks like [[Comicbook/DoctorStrange Dormamuu]] has a relative.
* FallenHero[=/=]FromNobodyToNightmare: WordOfGod states that he was originally a revered philosopher of his species until he got his hands on the Alpha Rune.
* GodIsEvil: Galapagus actually invokes his name in a "Thank God" context, suggesting he is revered as a god by his people. However, WordOfGod states that no one knows that he became corrupt.
* KarmaHoudini: [[spoiler:In ''Third Time's a Charm'', he, Hex, and Darkstar are freed from Charmcaster's bag, and regain their original forms, while Charmcaster herself ends up trapped inside her own bag. Darkstar is arrested, but Addwaitya just thanks/congratulates Gwen with a sinister slow-clap for getting them out, and teleports away. He'd made it clear in the episode that he hadn't changed one bit, so Gwen and company are in for trouble now.]]
** This has to do with the Friedkin University episodes being a PoorlyDisguisedPilot for a Gwen spinoff. If it had gotten off the ground, Addwaitya would have become the BigBad.
* ManipulativeBastard: [[spoiler:From his containment trinket in Charmcaster bag, he gives "advice" to aid his "master", having her take a path of action that ultimately lead to his freedom. His slow-clap and sarcastic congratulation to Gwen for freeing him later only emphasizes this.]]
* MySpeciesDothProtestTooMuch: As demonstrated by Galapagus, Geochelone Aerio usually are peaceful, innocent, kind beings who don't even know how to tell a lie. Addwaitya... [[TheSociopath is none of those things]].
* NinjaPirateRobotZombie: An alien turtle SorcerousOverlord and DimensionLord.
* NotSoHarmlessVillain: While he ''was'' in [[DimensionLord position to be a big threat]] in ''Ultimate Alien'', he was [[OvershadowedByAwesome outsmarted by Aggregor in his introduction]], and his second appearance had him [[HowTheMightyHaveFallen reduced to Charmcaster's prisoner and a shadow of his former glory]]. In ''Omniverse'', not only is he implied to be more dangerous since time without magic power has made him completely sane, in that condition he actually manages to [[ManipulativeBastard outsmart and trick Charmcaster into getting herself defeated and thus helping him escape]] [[PoisonousCaptive while still being her prisoner]], and is on the loose when last seen.
* PaletteSwap: He looks like a dark recolor of Terraspin, despite barely sharing his abilities. His ''Omniverse'' redesign avoids this, by adding a belt with a skull and loincloth, armbands, and with SpikesOfVillainy around his neck and shell.
* PoisonousCaptive: [[spoiler:To Charmcaster in ''Omniverse''. Charmcaster insists she's his master now, but his all-too calm acceptance of this fact makes it rather obvious that he's playing her. As expected, the advice he gives her eventually leads her to being defeated by the heroes and Addwaitya is set free.]]
* ReptilesAreAbhorrent: A rare case where turtles ''aren't'' an exception to the rule.
* SeriesContinuityError: In ''Ultimate Alien'', he seems to be irreparably insane even without his magic and Charmcaster is very clearly implied to have physically killed him ''before'' she takes his soul. Due to ''Omniverse'' retconning that episode through BroadStrokes, he is alive, now sane, and implied by Charmcaster to have been turned into a statue from the start after she overthrew him.
* SmugSnake: More like smug turtle, but in ''Ultimate Alien'', he is, for all his big talk, constantly overshadowed and outsmarted by bigger villains at the end of all his appearances. In ''Omniverse'', [[NotSoHarmlessVillain on the other hand]]...
* TheSociopath: He was presumably a regular kind Geochelone Aerio once, but years and years of possessing the Alpha Rune have thoroughly corrupted him.
* SorcerousOverlord: And an alien one, no less.
* WithGreatPowerComesGreatInsanity: Years and years of wearing the Alpha Rune have made him a paranoid psychopath. [[spoiler:He is restored to sanity after spending a long time without it in Charmcaster's bag, though this doesn't change his unrepentantly evil and arrogant nature.]]
* YouKilledMyFather: Is responsible for killing Charmcaster's father Spellbinder.

[[folder:Captain Nemesis]]
!Carl Nesmith (Captain Nemesis)
[[quoteright:309:https://static.tvtropes.org/pmwiki/pub/images/Overlord_1298.png]]
->'''Voiced by:''' Creator/ChristopherMcDonald

Originally a famous super-hero operating before Ben even got the Omnitrix, Captain Nemesis ended up causing a fake kidnapping attempt on young star actor Jennifer Nocturne, so he could save her and come back on the scene. After the kidnapping was stopped by Ben, he grew jealous of him, to the point he eventually offered a "friendly competition" between them to see who was the best hero. Ben ended up defeating him, causing Nemesis's jealousy to turn into a grudge, and he upgraded his armor to a dangerous level before attempting to get his revenge on him. He eventually lost all common sense and became a villain.

* AttentionWhore: {{Deconstructed}}; over the course of years, he became this due to not standing the fact people were forgetting him. This ends up leading to his FaceHeelTurn.
* BrokenPedestal: Ben used to idolize him before finding out how much of a jerk he had become, and is clearly disgusted to see what he is now ready to do.
* DisproportionateRetribution: He went evil, kidnapped Ben's LoveInterest, pulled out a SadisticChoice and got a fixation on killing him. Why? Because Ben upstaged him and defeated him in a so-called "friendly contest".
* EvenEvilHasLovedOnes: [[spoiler:His feelings for Jennifer Nocturne were apparently sincere, or at least became so.]]
* {{Expy}}: His appearance, abilities and characterization owe a lot to ComicBook/IronMan, and some of his stories about his old adventures call to mind the ComicBook/FantasticFour. His name and style, as a whole, are a rather obvious ShoutOut to Silver Age Superheroes.
* GreenEyedMonster: The major reason for him turning evil was because of his jealousy toward Ben. Ironically, Ben didn't mean to ruin his reputation and [[BrokenPedestal was actually a big fan of him before he turned evil]].
* FallenHero: he started out as a superhero, but ended up trying to cause fake kidnapping in order to get popular again, and eventually turned into a criminal due to his jealousy toward Ben. Both Ben and his Agent hinted he had been an actually great hero before.
* HeKnowsTooMuch: [[spoiler:He got a doctor to perform plastic surgery on him. Ben and Gwen later found the guy's body in a freezer.]]
* HumansAreTheRealMonsters: Partway into his second appearance, Ben reflects on Nesmith's casual brutality[[spoiler:, which by this point has included outright murder]]. He's aware that his usual opponents are leagues more dangerous than a human antagonist, but he still finds facing a hate-filled psycho driven by a petty, one-sided grudge to be very disturbing. As Gwen says, humans can be monsters, too.
* IgnoredEpiphany: When his agent tries to convince him against looking for revenge against Ben, he admits he does feel like he crossed the line when he freed the Robots from Dimension 12 just so he could save people from them, but thinks there is no way back.
* KickTheDog: [[spoiler:He was one of the few villains in the show to be explicitly shown to have killed human beings. At one point, he even killed an innocent driver just to steal his car.]]
* NotSoHarmlessVillain: His first episode portrays him as something like a Silver Age superhero parody turned evil, who is rather quickly disposed off. [[spoiler:Come his next appearance, he becomes the first villain to successfully commit homicide in the whole saga.]] ''Omniverse'' undoes this, basically making him an evil parody of Iron Man/Tony Stark.
* PetTheDog: [[spoiler:Surrendered so his accomplice Jennifer Nocturne could get medical attention.]]
* PickOnSomeoneYourOwnSize: By the time of his second appearance, he has developed an obsession on taking his revenge on Ben.
* PoweredArmor: He has a set of Iron Man-styled armor that tellingly [[AttentionWhore leaves his face exposed.]]
* {{Retcon}}: He had a face change operation in Ultimate Alien, but in ''Omniverse'', his face is back to its original appearance. That and everything else about him in the episode implies that in the new universe created in ''Omniverse'', the events of "To Catch a Fallen Star" never happened.
* RevengeBeforeReason: After escaping prison and getting a good head-start, he insists on taking care of Ben before fleeing the country. He tries to justify it by pointing out how Ben will relentlessly pursue him, but the way he angrily rebuffs any talk of just letting it go makes it clear he wants to settle a personal vendetta. [[spoiler:However, he does surrender when Jennifer is injured so that she can receive medical attention]].
* ThatManIsDead: "Captain Nemesis is dead! Now, call me ''Overlord''!". [[SubvertedTrope Although, it doesn't take]], since afterwards they either call him by his real name or Captain Nemesis.

[[folder:Trombipulor]]
!Trombipulor
[[quoteright:236:https://static.tvtropes.org/pmwiki/pub/images/Trombipulor_Omniverse_4842.png]]
->'''Voiced by:''' Creator/DeeBradleyBaker (''Ultimate Alien''), Creator/EricBauza (''Omniverse'')
-->''"You think you can stop me? I am Trombipulor! The Galaxy's biggest EvilGenius! In Height ''and'' Weight"''

An elephant-looking alien criminal who claims to be the biggest EvilGenius in the galaxy.

* AscendedExtra: In ''Ultimate Alien'', he was just a {{Bit Part Bad Guy|s}} who showed up a couple of times and did very little. His first ''Omniverse'' appearance gives him a whole episode.
* BitPartBadGuys: Was introduced as this in ''Ultimate Alien''.
* CurbStompBattle: In ''Universe vs. Tennyson'', Way Big defeats him by literally stepping on him.
%%* EvilSoundsDeep
* GeniusBruiser: Claims to be one, but there is no real evidence to prove he is ''that'' much of a genius. He does, however, possess some degree of scientific knowledge, seeing how he was able to build an army of robotic mice.
* TheJuggernaut: In ''Omniverse'', he proves to be somehow stronger than Humungousaur, despite the fact that Ben, Gwen and Kevin could apparently defeat him easily in ''Ultimate Alien''.
* NotSoHarmlessVillain: In ''Omniverse'' he manages to hold his own against Humungosaur and Way Big, and nearly had Ben and Rook on the ropes. Had Bluikc and Driba not reprogrammed his rats, he would have killed them.
** DiminishingVillainThreat: When he does come back in ''Special Delivery'' however, Ben uses Humungousaur against him and easily {{Curb Stomp|Battle}}s him. To add insult to injury, he does so with a move that had previously no effect on him.
* PowerUpFood: Peanuts are regarded by his people as a "sacred substance" and "ultimate power". They cause him to [[MakeMyMonsterGrow grow to gigantic size]] and make him stronger than Way Big.
* SuddenlyVoiced: In his first appearance, he spoke in elephant noises, which Ben understood through his universal translator. In his second appearance in ''Ultimate Alien'', and ''Omniverse'', he speaks English.
%%* WarElephants
* WhyDidItHaveToBeSnakes: He is ''terrified'' by mice or anything resembling them. He even based his robotic minions' design on them, believing this was would be terrifying to others. Needless to say, [[NightmareRetardant Ben and Rook are less than impressed]].
[[/folder]]

[[folder:Inspector 13]]
!Inspector 13
[[quoteright:320:https://static.tvtropes.org/pmwiki/pub/images/inspector_13_3086.png]]
->'''Voiced by:''' Creator/DeeBradleyBaker

Formerly one of the Weapon Masters of Techadon. In the ''Ultimate Alien'' episode of the same name, he attempted to steal the Ultimatrix from Ben. In ''Omniverse'', it is revealed that he was removed from the Techadon Empire for his failure to capture the Ultimatrix, and has become an independent businessman.
----
* ArmsDealer: After being disgraced, he puts his skills to use selling weapons to other villains.
* BadassBookworm: A technological genius who knows how to use his arsenal for offensive and defensive purposes.
* CrazyPrepared: Seems to have weapons and defenses to deal with ''every'' situation.
* CreepyMonotone: Except for the one time he laughs, he is this.
* EvilLaugh: Has one in his first appearance when Ben insists that the Ultimatrix isn't a weapon. And it's ''extremely'' creepy.
* EvilGenius: It comes with the territory of his work.
* EvilVersusEvil: In ''Omniverse'', Albedo's reason for impersonating Ben was to steal a polymorphic crystal to stabilize his transformations from him.
* GadgeteerGenius: Comes with being one of the Techadons' creators.
* HeWhoMustNotBeSeen: In-universe example; He is the only member of the Techadon Empire we actually get to see, and even then it's stated Ben and co. could see him and survive only because they were lucky.
-->'''Ben''': Nobody has ever seen the Techadons' creators!
-->'''Inspector 13''': Correction: Nobody has ever seen the Techadons' creators and ''survived''.
* HisNameReallyIsBarkeep: Inspector 13 isn't just his title, it's his actual name.
* HumansByAnyOtherName: Refers to Ben as a "Terran", which is a common term used in sci-fi used by extraterrestrials to refer to humans.
* KickTheSonOfABitch: Albedo gives this to him.
* TheSpock: Extremely cold and logical.
* SquishyWizard: He has access to extremely advanced technology, allowing him to deploy a whole arsenal of very powerful weapons, traps, [[MechaMooks Techadons]] and other defenses to fight, but once Ben is able to reach him with Four Arms for a direct fight, he is defeated in a single punch.
* TerseTalker: Expresses ''entirely'' this way.
* TookALevelInBadass: In his first appearance all it took was one punch from Fourarms to bring him down. In his second appearance he can fight evenly with several of Albedo's Ultimate alien forms and even gets the edge a few times.
* YouHaveFailedMe: Prior to his first appearance in ''Omniverse'', he was removed from the Techadon Empire for failing to capture the Ultimatrix, and has since resorted to illegal trade.
[[/folder]]

[[folder:Prisoner 775]]
!Prisoner 775
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/83e8ee81_5791_42e3_9d56_134cb936c689.png]]
[[caption-width-right:350:''"Nothing will ever be okay... '''AGAIN!'''"'']]
->'''Voiced by:''' Creator/DeeBradleyBaker

A Merlinisapien who was once the leader of a revolution against a tyrannical and oppressive government, he was captured and exiled from his homeworld. He arrived on Earth seeking refuge and aid, but in spite of his pleas, Colonel Rozum imprisoned him in Area 51. Prisoner 775 spent 50 years imprisoned, during which time the revolution was destroyed and his family killed. The traumatic loss and his imprisonment left him a vengeful and unhinged wreck who will do anything it takes to get revenge on Rozum.
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'''Villains premiering in:''' [[Characters/Ben10VillainsOriginalSeries The Original Series]] | ''[[Characters/Ben10VillainsAlienForce Alien Force]]'' | '''''Ultimate Alien''''' | ''[[Characters/Ben10VillainsOmniverse Omniverse]]'' | [[Characters/Ben10VillainsSpecials The Specials]] | [[Characters/Ben10Villains2016Series The 2016 series]]\\