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This article is about his mutation. You might have been looking for Ultimate Aggregor, the eponymous episode.

That's because my plan succeeded! The aliens are all in ME!

– Ultimate Aggregor arising from his transformation.[1]

Ultimate Aggregor is the mutation Aggregor underwent so he could become strong enough to search for and reassemble the four fragments of the Map of Infinity, the one item capable of leading him to the Forge of Creation, where he could absorb the powers of an infant Celestialsapien (which he refers to as the "Ultimate Prize") to gain unlimited power and rule the universe.


Ultimate Aggregor is generally similar to the mutations Kevin Levin when through in his youth, an amalgamation of various characteristics from five powerful aliens that he hunted down from the Andromeda Galaxy.

However, unlike Kevin, Ultimate Aggregor's appearance is more refined and balanced, as opposed to Kevin's random and mixed placement of alien body parts. This is a result of a special machine he used, as Aggregor's powers have the full potency of his victims' energy.

Ultimate Aggregor's mixed body parts were comprised of the hands and lower body of Bivalvan, the front torso of Galapagus (though with a darker color), the unarmored back and arms of Andreas, P'andor's faceplate on his neck, and seal on his chest, and a head resembling that of Ra'ad. He had Aggregor's horns (which became blue and larger), his eyes became blood-red, and his height increased to roughly ten feet.


Ultimate Aggregor is a cruel, sadistic, menacing, and remorseless sociopath, who does whatever it takes to achieve his goals, having no remorse for any of his actions. His intelligence is extremely high and his plans go to very great lengths to succeed - as shown when he managed to trick Ben Tennyson and his team into retrieving the fragments of the Map of Infinity for him, much to the anger of the entire team.


By the end of Ultimate Aggregor, Aggregor used the Entropy Pump to transfer the powers and abilities of the five aliens into himself. Humungousaur managed to stop the pump before it destroyed reality. Unfortunately, it was too late as Aggregor had completely absorbed the five aliens, transforming into his massive, mutated chimeric state.

In Map of Infinity, Humungousaur became enraged over being unable to save the Andromeda aliens that he viciously attacked Ultimate Aggregor, demonstrating every ounce of his incredible strength. Unfortunately, Humungousaur's attacks did near nothing to Ultimate Aggregor. Showing off his newly acquired powers and abilities, Ultimate Aggregor toyed with Ben's team and easily defeated them all, greatly damaging Grandpa Max's nervous system in the process. After knocking Humungousaur out, Ultimate Aggregor left Earth.

Azmuth reveals that the reason Aggregor absorbed the aliens was so that he had the power to find the four fragments of the Map of Infinity, which will allow him to enter the Forge of Creation and obtain the greatest power in the universe. In order to stop him, Ben and the others must keep him from getting at least one of the fragments.

After going through a temple filled with booby traps on Mikd'lty, Ultimate Echo Echo and the others nearly reach the first piece, but due to Four Arms and Kevin being forced to hold up the door that leads to the chamber holding the piece and Gwen being hit by a poison dart, they were powerless to prevent Ultimate Aggregor (who used the trio to discover the traps and lead him to the first fragment) from escaping with the first fragment of the map.

In Deep, Ultimate Aggregor invaded the core of Piscciss to steal the second piece of the map, which was in the form of the planet's anti-gravity generator. With the ocean planet falling apart, Ultimate Big Chill had no choice but to save Piscciss and let Ultimate Aggregor escape.

In Where the Magic Happens, the trio chased Ultimate Aggregor to the Door To Anywhere, which Ultimate Aggregor used to enter Ledgerdomain. Gaining the assistance of Charmcaster, the trio entered Ledgerdomain. When the group was in a battle with Addwaitya, Ultimate Aggregor used it as a diversion to attack Addwaitya from behind and steal the Alpha Rune from him, the third piece of the map, before thanking Ultimate Humungousaur for helping him and teleporting away. With only one more piece left, Ben becomes more determined than ever to stop Ultimate Aggregor.

In Perplexahedron, Ultimate Aggregor travels to the Perplexahedron, which was built by Paradox to protect the fourth piece of the Map of Infinity. He uses the map's other pieces to enter the Perplexahedron and makes his way through it, where he encounters Gwen and leaves her to freeze in a snow room. He finally makes it to the fourth piece but has a battle with Ultimate Cannonbolt. Despite his best efforts, Ultimate Cannonbolt is beaten and loses the final piece to Ultimate Aggregor, who escapes the crumbling Perplexahedron, now able to enter the Forge of Creation. Despite losing the battle for the map, Ben and the others vow to stop Ultimate Aggregor once and for all.

Ultimate Aggregor is stopped just in time

In The Forge of Creation, Ultimate Aggregor attacks Ben, Young Ben, Kevin and Gwen in the Forge of Creation and easily defeats Gwen and Kevin, leaving the Bens to fight him. Ultimate Swampfire grows vines to hold Ultimate Aggregor in place while Young Stinkfly attacks him. Ultimate Aggregor breaks free and knocks down both Ultimate Swampfire and Stinkfly, who transform back to Ben and Young Ben.

Young Ben offers his Omnitrix to Kevin to absorb it and fight Ultimate Aggregor, but Kevin refuses and absorbs the energy from the Ultimatrix to give him more power. Ultimate Aggregor enters a Celestialsapien egg and prepares to absorb the infant inside it. However, Ultimate Aggregor is stopped by Ultimate Kevin, who eventually reverts him back to normal state and left him laying unconscious. After that, Aggregor's fate is left undetermined. It was later revealed in "Night of the Living Nightmare" that he is currently incarcerated.

Powers and Abilities

Thanks to the use of his modified Entropy Pump, Ultimate Aggregor had access to Bivalvan, Galapagus, P'andor, Andreas, and Ra'ad's abilities at full strength, unlike Kevin's various mutations. This is because the alien prisoners were converted into pure energy, which Aggregor absorbed during the initial transformation.[1][DM 1]

Ultimate Aggregor was extremely strong, being able to destroy a large portion of Los Soledad and knock out Humungousaur with a powerful seismic strike.[2]

Ultimate Aggregor was seemingly invulnerable, being able to survive a savage beating from Humungousaur thanks to a combination of Bivalvan's armored exoskeleton,[2] Andreas' natural armor, Galapagus' shell, and P'andor's Containment Suit.

Being part-Orishan, Ultimate Aggregor shared many of the same powers as both Bivalvan and Water Hazard, including hydrokinesis and underwater breathing.[3]

Being part-Geochelone Aerio, Ultimate Aggregor shared many of the same powers as both Galapagus and Terraspin, including aerokinesis and Mana immunity,[2] the latter of which was previously a weakness for Aggregor.

Being part-Prypiatosian-B, Ultimate Aggregor shared many of the same powers as both P'andor and NRG, including nuclear energy blasts, heat generation, pyro immunity, and cryo immunity.[2]

Being part-Talpaedan, Ultimate Aggregor shared many of the same powers as both Andreas and Armodrillo, including terrakinesis and earthquake generation.[2]

Being part-Amperi, Ultimate Aggregor shared many of the same powers as both Ra'ad and Ampfibian, including electrokinesis, electrical telepathy, flight, energy shield, and space survivability.[4]

Being part-Osmosian, Ultimate Aggregor retained his natural matter and energy absorption powers.[DM 2] As the circumstances behind this form were vastly different from Kevin's, Aggregor never suffered from insanity.


Despite his immense durability, Ultimate Aggregor still felt pain from plasma pistols,[2] an Evolved Arburian Pelarota's attacks,[4] an Aerophibian's nueroshock blasts, a Cerebrocrustacean's electric beams, and a Methanosian's fire attacks.[5]

Correlating with his durability limit, Ultimate Aggregor was unable to absorb enemy attacks because of inexperience and poor skills with his absorption abilities.[DM 3]

Ultimate Aggregor was vulnerable to being reverted back into his normal form by another Osmosian, mainly due to the full strength of his powers coming from converting the prisoners into energy and absorbing it.[5][DM 1]


Ultimate Alien

Season 1

Season 2

Season 3

Mobile Games


Ultimate Aggregor's name comes from the word "aggregate", which means to form a collection from different parts. This is obviously a reference to his body being made of parts from the Andromeda aliens.


  • Ultimate Aggregor was not just "standing there in shock" when Ultimate Kevin attacked him. Rather, he was trying to absorb Ultimate Kevin's attacks but could not due to his inexperience in absorbing the kind of energy the latter possessed.[DM 3]
  • In the game FusionFall, there is a code set that comes with an Ultimate Aggregor Mask.
  • Ultimate Aggregor is similar to Perfect Cell from Dragon Ball Z in which they are incredibly powerful forms gained in quests to gain ultimate power and perfection that are very difficult for heroes to defeat.


Crew Statements

Dwayne McDuffie

See Also

Vilgax DagonLucubraConduit EdwardsEsotericaBioidsDronesSquid 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 Kevin
Incursean Empire MilleousAtteaRaffMajor GlorffLieutenant RanaSangfroidWay Bads
Forever Knights DriscollEnochPatrickUrienCyrusJoseph ChadwickConnorDagonetDr. JekyllMortonReginaldTwin KnightsSquireCoach FinnDragon RobotForever NinjaSquires
Dr. Animo Mutant FrogMutant HamsterMutant CockatielMutant MammothMutant TyrannosaurusHeatbatMutant SeagullMutant SquidMutant LepidopterranMutant BatMutant Prairie DogMutant HornetMutant ChickensMutant Chicken LeaderMutant KangarooMutant SnailMutant AntsMutant MosquitoMutant GiraffeTechnobugMutant ChupacabrasFrankencryptidMutant SquirrelsCrystal Claws
Psyphon Bug-LiteBouncersBubble HelmetLiamGorvanMinionNightmarish AlienPiscciss Volann PrisonerPickaxe AliensSweet-Eels SparklefunkHooded AlienThunderpigTummyhead
Magic AddwaityaCharmcasterDarkstarPallorfangScrutin
Highbreed Highbreed CommanderDNAliensXenocyteMizaruSimian
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 ThugFistina
The Hive Elena ValidusNanochipDecoy 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 ColemanCollectimusDr. DoomacusDuaneEvil Way BigFrankGarbage MonsterPrince GyulaHammerHowell WainwrightHulex ColonelHulex WorkersInspector 13JackJarettJonah MelvilleKolarCaptain KorkKrakkenKundoLepidopterran PrisonerMaltruantMino-TogaMissyMorggMutant SeagullsMyceliumNyancy ChanOliver ThompsonPinkyPlant AlienPlant ClonesPoltroonPrisoner 775Red LeaderScooterSeebikSolid PluggSsserpentSubliminoSuemungousaurSunnySurgeonTetramand PrisonerTrans-Dimensional 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
Future Dr. AnimoExo-SkullMot SnikrepSplootSubdoraVilgax
Gwen 10 (What-If?) Vilgax
Alternate Dimension Mad PakmarOrange Offenders
Generator Rex AlphaBlack KnightBiowulfI-BolSkalamander
Secret Saturdays V.V. ArgostMunya
Books AnimusAztakCaeciliaDJ ZenutFrostbyteGontuGroombahInfinite MonkeyLouie the HairdresserParasiteSeñor ChaosSlezakThe Collector (Collectible Heroes)The Collector (Powerless)
Games RemoteSnap DragonTwo-Headed Snake