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And last, but not least, the freak whose unique skill is as vile as his attitude, Acid Breath!

– The Barker introducing Acid Breath.[1]

Acid Breath is one of Zombozo's three minions, and without a higher rank to command them, he acts as the trio's leader.


Acid Breath has wrinkly, pale skin. He has red eyes with different-sized pupils, and little bits of straight black hair poking out of the top of his head. Most of his teeth are missing and his gums are green.

His outfit is black with bright yellow stripes on his arms, and he has a little bit of a hunch back.

In Omniverse, Acid Breath looks much younger than in the Original Series He looks paler, the hair on his head has curled, and he has a more greenish skin tone. His outfit looks similar to his original one, but his shirt goes all the way to his neck, and it has a more overall-like appearance.


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Ben 10[]

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Acid Breath first appeared in Last Laugh. He performed in a circus to attract an audience and later went out to rob while Zombozo fed on the laughter of the town. He and the other Circus Freaks were stopped by Wildmutt but saved by Zombozo. During Upgrade's attack later on, Acid Breath's mouth was plugged by a baseball, following Upgrade merging with a baseball launcher.

In Ghostfreaked Out, Acid Breath and the rest of the Circus Freaks robbed Bancroft Academy, until they were stopped by Zs'Skayr, who later forced them to work for him. He later battled Four Arms and failed to capture Grey Matter. When Zs'Skayr sent the Circus Freaks after Max and Gwen, Acid Breath cornered Gwen in a kitchen. Gwen managed to neutralize him with a fire extinguisher, then hit him on the head with a frying pan, knocking him out.

In Ben 10 vs. Negative 10: Part 1 and Part 2, Acid Breath, Thumbskull and Frightwig were part of the Negative 10. Acid Breath attempted to wrest control of the group from the Forever King early on, but he and the rest of the Freaks were beat back by the Red Knight.


Acid Breath appeared in Something Zombozo This Way Comes where he and his team were re-hired by Zombozo to distract Ben while he fed off people's fear. He was defeated when Frankenstrike shoved Frightwig's hair in his mouth. Zombozo used Acid Breath's breath to light a cannon to escape and then threw him aside. After Zombozo escaped, Acid Breath and his team were arrested by the Plumbers.

Powers and Abilities[]

Acid Breath can release corrosive acid from his mouth in the form of either a vapor or a liquid; he claims that he learned this from his mother. This acid can easily dissolve whatever he wants it to, even metal and stone. It can also be used to light the fuse of a cannon.

Acid Breath is also quite agile.


If his mouth is jammed by an object, such as a baseball, or if something causes him to cough and gag, such as the contents of a fire extinguisher, Acid Breath will be briefly unable to use his acid breath or spit.

Acid Breath is vulnerable to being possessed by an Ectonurite.[2]

Acid Breath is weak against electricity, such as that generated by a Transylian.[5]


Ben 10[]

Season 1[]

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Prime Timeline
Vilgax Bioid (Original)Bioid (Omnitrix Army)MechadroidSquid MonsterUltimate Vilgax
Dr. Animo Mutant FrogMutant HamsterMutant ParrotLiving MammothLiving TyrannosaurusHeatbatMutant Seagull (Original Series)Mutant OctopusMutant Lepidopterran/Splixson HybridMutant BatMutant Prairie DogMutant HornetPterodactylPterodactyl LeaderMutant KangarooMutant SnailMutant AntMutant MosquitoMutant GiraffeTechnobugChupacabraFrankencryptidMutant Squirrel
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Zombozo Acid BreathFrightwigThumbskullZombie Clowns
Rojo's Gang RojoAzulAmarillo
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Lenopan Mr. MannMrs. MannCamille's Ex-BoyfriendMann Family's Bodyguard
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Dagon LucubraConduit EdwardsRichEsoterica
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Rooters ServantisPhil BillingsRagnarokSwiftLeander
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Others AntonioBenevelonBlue LeaderBuzzCharles ZenithClancyCodon Stream MonsterConvictMayor ColemanCollectimusLord DoomicusDuaneFrankPrince GyulaHammerHowell WainwrightHulex ColonelHulex WorkersInspector 13JackJarettJonah MelvilleKolarCaptain KorkKrakkenKundoLepidopterran PrisonerLiving MushroomsMaltruantMino-TogaMissyMorggMutant SeagullsMyceliumNyancy ChanPiscciss KrakenPinkyPlant AlienPlant ClonesPoltroonPrisoner 775Red LeaderSeebikSimianSolid PluggSsserpentSubliminoSuemungousaurSunnySurgeonTetramand PrisonerTrash MonsterTrombipulorViolet OffendersKing XarionYetta
Alternate Dimensions/Timelines
Original Future Timeline Dr. AnimoExo-SkullKevin LevinMot SnikrepSplootVilgaxVulkanus
Omniverse Future Timeline Dr. AnimoExo-SkullSubdora
Time Heals Timeline CharmcasterHex
Dimension 23 Carrot MonsterOrange Offenders
Mad Ben's Dimension Mad Pakmar
Gwen 10 (What-If?) Vilgax
Goodbye and Good Riddance (What-If?) VilgaxBird Villains
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Non-Ben 10
Generator Rex AlphaBlack KnightBiowulfI-BolSkalamander
The Secret Saturdays V.V. ArgostMunya