Ben 10 Wiki
34497a3fe0ef52949a1ba8e99894ed69.png This article belongs to the Classic Continuity

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


Clancy originally was a strange-looking man with bluish 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 beetle on the front, a pair of blue-grey pants with the knees torn out, and a brown leather coat torn at the shoulders.

He later became an insect, with a green exoskeleton, yellow eyes on stalks, antennae, a pair of extra arms, and wings on his back.[1]


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 Four Arms is able to come to the rescue. 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.

Later on, Clancy becomes a part of the Negative 10, although his appearance drastically changes. He appears to have mutated into a bug-like monster similar to a praying mantis; it's 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 group went to Mt. Rushmore, where they did battle with the Tennysons.

Clancy and his comrades eventually fell victim to infighting after Forever King Driscoll and the Forever Ninja departed, and were trapped in the Sub Energy containment field. Unlike most of his other compatriots, Clancy has not been heard from since. His fate after these events is currently unknown.

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 green yellow color.

He also had physically enhanced abilities, notably his agility.

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.

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


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 he chuckled nervously at Max before being knocked out. His insect form lacks this weakness, however.

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

Clancy is vulnerable to electricity, such as that generated by an Opticoid.

Video Games

In Ben 10: Protector of Earth, he appears as a mini-boss for the south-east/Bayou level, working for Dr. Animo. He appears in his unmutated form though retains his ability to travel in a cloud of insects. After Ben defeats him, he's interrogated for the location of the kidnapped Gwen though he provides no useful information other than Animo is plotting to turn Gwen into one of his mutated monsters.


Ben 10

Season 1

Season 4

Video Games



Thomas Perkins


Vilgax DagonLucubraConduit EdwardsRichEsotericaBioid (Original)Bioid (Alien Force)MechadroidSquid Monsters
Zs'Skayr CrüjoKuphuluLord TransylMummyViktorYenaldooshiAnur-Mirrored BenAnur-Mirrored CharmcasterAnur-Mirrored HobbleAnur-Mirrored RookMutant Pumpkins
Aggregor Aggrebots
Evil Bens EonAlbedoBad BenBenzarroEon's ServantsMad BenNega Ben
Faction Dr. PsychobosKhyberKhyber's PanuncianMalware
Rooters ServantisPhil BillingsRagnarokSwiftLeander
Mutated Kevin Kevin 11Kevin 11,000Ultimate KevinOmniverse KevinOmniverse Flashback Kevin
Incursean Empire MilleousAtteaRaffMajor GlorffLieutenant RanaSangfroidWay Bads
Forever Knights DriscollEnochPatrickUrienCyrusJoseph ChadwickConnorDagonetDr. JekyllMortonReginaldTwin KnightsSquireCoach FinnMech DragonForever NinjaSquires
Dr. Animo Mutant FrogMutant HamsterMutant ParrotLiving MammothLiving TyrannosaurusHeatbatMutant SeagullMutant SquidMutant LepidopterranMutant BatMutant Prairie DogMutant HornetDragon MenImpossibleMutant KangarooMutant SnailMutant AntMutant MosquitoMutant GiraffeTechnobugMutant ChupacabraFrankencryptidMutant Squirrel
Psyphon Bug-LiteBouncersBubble HelmetLiamGorvanMinionNightmarish AlienPiscciss Volann PrisonerPickaxe AliensSweet-Eels SparklefunkHooded AlienThunderpigTummyhead
Magic AddwaityaCharmcasterDarkstarPallorfangScrutin
Highbreed Highbreed CommanderDNAliensXenociteMizaruSimian
Vreedles MaPaOctagonRhomboidParallelogramIsosceles Right TriangleDodyPretty Boy
Bounty Hunters SixSixSevenSevenEightEightSynthroidSunderKraabVulkanus
Vengers Billy BillionsCaptain NemesisKangaroo KommandoMazumaSimonsWill Harangue
Lenopan Mr. MannMrs. MannCamille's Ex-BoyfriendMann Family's Bodyguard
Fistrick CorvoHoodlumFistrick's Thug
The Hive Elena ValadisNanochipDecoy QueenEvil BuildingsShip It's Employee
Road Crew Baron HighwayTurbineRoad Rage
Zombozo Acid BreathFrightwigThumbskullZombie Clowns
Great One Enforcer AlienInterpreter AlienLeader Alien
Rojo's Gang RojoAzulAmarillo
Other Villains AntonioBenevelonBlue LeaderBuzzCharles ZenithClancyMayor ColemanCollectimusLord DoomicusDuaneEvil Way BigFrankPrince GyulaHammerHowell WainwrightHulex ColonelHulex WorkersInspector 13JackJarettJonah MelvilleKolarCaptain KorkKrakkenKundoLepidopterran PrisonerMaltruantMino-TogaMissyMorggMutant SeagullsMyceliumNyancy ChanOliver ThompsonPinkyPlant AlienPlant ClonesPoltroonPrisoner 775Red LeaderScooterSeebikSolid PluggSsserpentSubliminoSuemungousaurSunnySurgeonTetramand PrisonerTrans-Dimensional MonsterTrash MonsterTrombipulorViolet OffendersKing XarionYetta
Robots B.L.R.R.T.S.A.M.Slix VigmaRed RobotComputronComputron's MinionsOttoTechadon RobotsMechaneerNaljian DestructorR.E.D.sMouse MinionsStalkerMoon RobotsRemotePerplexahedron GuardsJungle Guardians
Original Future Timeline Dr. AnimoExo-SkullKevin LevinMot SnikrepSplootVilgax
Omniverse Future Timeline Dr. AnimoSubdora
Dimension 23 Orange Offenders
Mad Ben's Dimension Mad Pakmar
Gwen 10 (What-If?) Vilgax
Goodbye and Good Riddance (What-If?) VilgaxBird Villains
Books AnimusAztakCaeciliaDJ ZenutFrostbyteGontuGroombahInfinite MonkeyLouie the HairdresserParasiteScornSeñor ChaosSlezakThe Collector (Collectible Heroes)The Collector (Powerless)Trash Monster
Games Crystal ClawsRemoteSnap DragonTwo-Headed Snake
Generator Rex AlphaBlack KnightBiowulfI-BolSkalamander
The Secret Saturdays V.V. ArgostMunya