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34497a3fe0ef52949a1ba8e99894ed69 This article belongs to the Classic Continuity

Clancy is a mutant human who first appeared in Side Effects.


Clancy originally was a strange-looking man with bluish-green skin, a goatee, and black hair kept long and messy with purple highlights. Additionally, he had overgrown, blackened fingernails and fanged teeth. He wore a black hooded shirt with a gray beetle symbol on the front, a pair of blue-grey pants with the knees torn out and covered in dirt on the ankles, a brown leather coat torn at the shoulders, and black shoes.

As of Ben 10 vs. Negative 10: Part 1, Clancy has become a bipedal insect-like monster similar to a praying mantis with a green exoskeleton, yellow eyes on stalks, antennae, a pair of extra arms, and wings on his back.


Our grandfather built this building. We grew up here! Just me and my little friends... They are the only ones who understand, and no one is evicting us!

– Clancy.[2]

Clancy is mentally ill and has a vindictive attitude, especially towards humans. He was unwilling to leave the rundown apartment he called home despite the danger in order to honor his grandfather, who had both built and owned the apartment when he was alive. He is also obsessive and vengeful as seen by his attacks on the councilwoman and later the Tennysons. In fact, the only beings he shows any compassion for are the bugs he communicates with.



Clancy used to live at 8610 Chester Street, an apartment that was built by his grandfather long ago.

Ben 10[]

Clancy first appeared in Side Effects. When Councilwoman Liang attempts to redevelop the area, Clancy learns that his residential area must be torn down to successfully finish the project. He decides to take action and tries to scare the construction workers away by sending swarms of insects after them and sending an army of wasps to the gathering in Chinatown.

When he finds out that it was the Councilwoman who ordered the demolition, he intends to feed her to his black widow spiders, but Ben is able to come to the rescue as Four Arms. Sending fire ants to attack Four Arms, his attempt to save his home backfires as Four Arms crashes into several support beams, causing the old house to collapse in on itself.

A now homeless Clancy plans to get his revenge against the people who took his home through the idea of destroying the whole city by means of a nuclear meltdown, with him surviving the blast with an armor made of cockroaches. He is stopped by Heatblast (with his powers reversed due to Ben's cold) and is frozen in place to be carted away by the authorities.

Clancy manages to thaw out and escape, and soon decides to take revenge on the Tennysons for destroying his home and ruining his vengeance on the city. Luckily, Grandpa Max's San Ju Yen Pien medicine overrides Clancy's control over his insects and Max delivers the final blow to knock him out once and for all. And so, he waited for the authorities to drag him off.

In Ben 10 vs. Negative 10: Part 1, Clancy has joined the Negative 10 yet his appearance was drastically altered, as he has been mutated into a bipedal insect-like monster. It is heavily implied that Dr. Animo had a hand in this since he is a master of mutation, especially when it comes to animals. After helping steal one of the keys to the Sub-Energy from Seattle Space Needle Plumber Base, he and the other members of the Negative 10 went to Mt. Rushmore.

In Ben 10 vs. Negative 10: Part 2, Clancy and the rest of the Negative 10 did battle with the Tennysons and Cooper before they eventually fell victim to infighting after Forever King Sir Driscoll and the Red Knight departed. Along with the rest of the group, Clancy was trapped in the Sub-Energy containment field.

Powers and Abilities[]

Clancy has the ability to communicate with and control certain types of animals, essentially anything falling under the category of insects and arthropods, such as wasps, spiders, termites and cockroaches. His ability seems to be telepathically based, because whenever he executes a command, his eyes glow an ominous bright greenish-yellow color.[2]

Clancy could also tell his insect minions to cover up his entire body and form a sort of "bug suit" around him, which gives him a very muscular appearance and enhanced strength, enough to lift a full-grown man into the air with one arm.[2]

Clancy also had physically enhanced abilities, notably his agility.[2]

Clancy's current insect form has a durable exoskeleton, and the ability to fly. He can travel undetected in a cloud of bugs and spew living insects from his mouth. Additionally, he is even more dangerous as a combatant, with an arthropod's proportionate speed and strength.[1]


It is shown that Clancy greatly relies on his insect minions to do all the dirty work, including fighting. This means that he is helpless in a fight without them, as shown when Ben distracted his bugs with a jar of San Ju Yen Pien.[2]

Clancy can be immobilized by ice, such as that generated by a sick Pyronite[2] or an Opticoid.[3]

Video Games[]

In Ben 10: Protector of Earth, Clancy appears as a mini-boss for the south-east/Bayou level, appearing in his pre-insect form and working for Dr. Animo. After Ben defeats him, he is interrogated for the location of the kidnapped Gwen. Though he provides no useful information to Ben and Max, he does state that Animo is plotting to turn Gwen into another of his mutated monsters.


Ben 10[]

Season 1[]

Season 4[]

Video Games[]

Ben 10[]


  • After working with Clancy, Animo discovered ways to gain psychic control over animals.[pop-up 1][4]
  • Though Clancy appears in his original form in the Protector of Earth videogame, he shown being able to travel in a cloud of insects. This ability would eventually be adapted into canon in Ben 10 vs. Negative 10, albeit while in his mutated form.
  • Clancy's bug form in Ben 10 vs. Negative 10 was designed by Thomas Perkins.[TP 1]
  • Had Clancy appeared in Omniverse, he would look like the cockroach monsters from the 1997 sci-fi/horror film Mimic.[DJW 1]


Derrick J. Wyatt[]

Thomas Perkins[]


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
Bounty Hunters SixSixSevenSevenEightEightSynthroidSunderKraabVulkanus
Zombozo Acid BreathFrightwigThumbskullZombie Clowns
Rojo's Gang RojoAzulAmarillo
Magic AddwaityaCharmcasterDarkstarPallorfangScrutin
Forever Knights Sir DriscollEnochPatrickUrienSir CyrusJoseph ChadwickConnorSir DagonetDr. JekyllSir MortonSir ReginaldTwin KnightsSquireCoach FinnMech DragonRed KnightSquires
Great One Enforcer AlienInterpreter AlienLeader Alien
Zs'Skayr CrüjoKuphuluLord TransylMummyViktorWerewolfAnur-Mirrored BenAnur-Mirrored CharmcasterAnur-Mirrored HobbleAnur-Mirrored RookLiving Pumpkins
Vengers Billy BillionsCaptain NemesisKangaroo KommandoMazumaSimonsWill Harangue
Lenopan Mr. MannMrs. MannCamille's Ex-BoyfriendMann Family's Bodyguard
Road Crew Baron HighwayTurbineRoad Rage
Evil Bens EonAlbedoBad BenBenzarroEon's ServantsMad BenNega Ben
Highbreed Highbreed CommanderDNAlienEdnaMoeShemMizaruXenocite
Incursean Empire MilleousAtteaRaffMajor GlorffLieutenant RanaSangfroidWay Bads
Vreedles MaPaOctagonRhomboidParallelogramIsosceles Right TriangleDodecahedronPretty Boy
The Hive Elena ValadisMicrochipDecoy QueenLiving BuildingsShip-It Employee
Aggregor AggrebotsUltimate Aggregor
Dagon LucubraConduit EdwardsRichEsoterica
Faction Dr. PsychobosKhyberKhyber's PanuncianMalware
Psyphon Bug-LiteBouncerBubble HelmetLiamGorvanPsyphon's MinionNightmarish AlienPiscciss Volann PrisonerPickaxe AliensSweet-Eels SparklefunkHooded AlienThunderpigTummyhead
Fistrick CorvoHoodlumFistrick's Thug
Rooters ServantisPhil BillingsRagnarokSwiftLeander
Robots B.L.R.R.T.S.A.M.Slix VigmaRed RobotComputronComputron's MinionsOttoTechadon RobotsMechaneerNaljian DestructorR.E.D.sMouse MinionsStalkerRemoteJungle Guardians
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
Books AnimusAztakCaeciliaDJ ZenutDr. DoomFrostbyteGontuGroombahInfinite MonkeyLouie the HairdresserParasiteScornSeñor ChaosSlezakThe Collector (Collectible Heroes)The Collector (Powerless)Trash Monster (Down in the Dumps)Triple Trouble
Games Crystal ClawsFeralineForever NinjaFusion BenGiant Vilgax DestroyerMacerootRemoteSnakeflySnap DragonTerracotta ArmyTerracotta GeneralTerracotta DragonThornhoundVulpin Serpent
Non-Ben 10
Generator Rex AlphaBlack KnightBiowulfI-BolSkalamander
The Secret Saturdays V.V. ArgostMunya