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Evolved Vaxasaurians (or Vaxasaurian Ultim)[merch 1] are the evolved counterparts of the Vaxasaurian species.


Evolved Vaxasaurians are an ankylosaurus-like species, being about twenty feet tall. Evolved Vaxasaurians have green or grey skin. On the sides of their face are black spikes, pointing down.

Evolved Vaxasaurians possess a dark blue, spiked shell. Their chest and torso is dark blue with spikes on them. Their tail has a blue mace on the end of it, with silver spikes.

An evolved Vaxasaurian's knuckles have barrels on them, which they can transform into four-barreled missile launchers at will.

Evolved Vaxasaurians are more Ankylosaurus-like than Stegosaurus-like, their skin becoming green and gaining a more prominent natural armor, colored steel blue. Being evolved for combat, an evolved Vaxasaurian has a weaponized mace tail and several spikes protruding from its armor and shell.

Evolved Vaxasaurian have claws instead of fingernails.


It was implied that evolved Vaxasaurians reproduce by laying eggs like Vaxasaurians, when Sentient Ultimate Humungousaur stated that his mother tried to eat him before he had hatched.[1]

Powers and Abilities

Evolved Vaxasaurians are exponentially stronger than their devolved counterparts, even when at full size. They are strong enough to lift and throw a To'kustar in record timing[1] and make a giant crater in the ground by punching it.[2]

Evolved Vaxasaurians have very durable armor plating throughout their body, giving them enhanced durability combined with their thick skin.

Evolved Vaxasaurians can transform their hands into bio-gatling guns that shoot missiles,[note 1] which deal major damage.

An evolved Vaxasaurian's tail has a mace-like structure at the tip, which can be used as a flail.

Like regular Vaxasaurians, evolved Vaxasaurians can survive in the vacuum of space for a short time and can create shock waves by clapping their hands.


Evolved Vaxasurians lack their devolved counterparts' ability to change their size.[DM 2][DM 3][DM 4]

An evolved Vaxasaurian's missiles can be absorbed by Conductoids.[3]

Like regular Vaxasaurians, evolved Vaxasaurians are vulnerable to electricity, such as that generated by a Conductoid.[3]

Despite their enhanced strength, evolved Vaxasaurians can still get muscle cramps, meaning their strength has a limit.[4] They are also physically weaker than members of Atomix's species, as Atomix easily defeated Negative Ultimate Humungousaur.[5]

Evolved Vaxasaurians can be harmed by magic, as demonstrated with Sentient Ultimate Humungousaur.[1]

Notable Evolved Vaxasaurians

Notable Evolved Vaxasaurian Hybrids

Naming and Translations

Language Name Origin
Spanish (HA) Vaxasaurio Supremo
Máximo Vaxasuaurio (The Ultimate Heist)
From Vaxasaurio Supremo, Supreme Vaxasaurian
From Máximo Vaxasuaurio, Maximum


Vaxasaurian comes from the Icelandic "vaxa", which means "to grow", and "sauria", which is a clade of lizards.


  • In Ben 10 Ultimate Alien: Cosmic Destruction, evolved Vaxasaurians retain human-like nails with their claws.
  • The Ultimate Alien Database on the Ben 10 Ultimate Alien: Escape from Aggregor DVD incorrectly claims that their homeworld is Terradino Ultim, despite the species being artificial.


  1. In Alien Force and Ultimate Alien, an evolved Vaxasaurian's missiles were depicted as kinetically unstable bone fragments.[DM 1][merch 1] In Omniverse, the missiles have been changed to better resemble traditional missiles.



  1. 1.0 1.1 Ben 10 Ultimate Alien: Escape from Aggregor DVD; file

Dwayne McDuffie

Sapient Species
AcrosianAerophibianAmperiAnoditeAppoplexianArachnichimpArburian PelarotaAtrocianBiot-savartianCelestialsapienCerebrocrustaceanChimera Sui GenerisChronianChronosapienChurlCitrakayahConductoidContumeliaCrystalsapienDetroviteDracosianDragonEctonuriteFloraunaGalileanGalvanGalvanic MechamorphGeochelone AerioGimlinopithecusGourmandHighbreedHulexHuman (Osmosian)IckthyperambuloidIncurseanKineceleranKraahoLenopanLepidopterranLewodanLimaxLoboanMaxatomarMerlinisapienMethanosianNaljianNecrofriggianNemuinaNosedeenianOpticoidOrishanOrthopterranOryctiniPantophagePetrosapienPiscciss PremannPiscciss VolannPlanchakülePolar ManzardillPolymorphProtostPrypiatosian-BPugnavorePyroniteRevonnahganderSegmentasapienSlimebioteSonorosianSotoraggianSphoeroidSplixsonSylonnoidSynthroidTalpaedanTetramandThep KhufanTo'kustarTransylianUxoriteVaxasaurianVladatVreedleVulpimancerZaroffian
Unnamed Sapient Species
Argit'sAstrodactyl'sAtomix'sBall Weevil'sDagger AliensDecka'sEnforcer Alien'sGutrot'sHobble'sInspector 13'sKickin Hawk'sMedic'sMole-Stache'sPakmar'sPickaxe AliensProbity'sStone CreaturesTack'sTiny'sToepick's
Evolved Sapient Species
Evolved AppoplexianEvolved ArachnichimpEvolved Arburian PelarotaEvolved GalileanEvolved GalvanEvolved HumanEvolved MethanosianEvolved NecrofriggianEvolved Polar ManzardillEvolved SonorosianEvolved To'kustarEvolved VaxasaurianEvolved Vulpimancer
Non-Sapient Species
Airborne Clown VirusAldebaran BeidafangsAnubian BaskurrBuglizardCassiopeian Dream EaterChupacabraCorrupturaCrabdozerDasypodidaeDravekGracklflintHavoc BeastHumpbackusKaosseffexx UltimasauriaLucubraMuroidNanochipNight MareNull GuardianOmnivoraciousPallorfangPanuncianPsycholeopterranQuartilloptusRoot SharkSand RipperScreegitScrutinSlammoidTerroranchulaVicetopusVolaticus biopsisWigzelian Org BeastXenocite
Unnamed Non-Sapient Species Evolved Non-Sapient Species
Cyber SquidsKhoros Reptilian MountLiving MushroomsMucilator'sSquid MonstersTerroranchula's SpeciesTime BeastsUnnamed Turrawuste Species Evolved Panuncian
Non-Canon Sapient Species
Sool & Gontu's Species
Non-Canon Non-Sapient Species
Cyber Squids (Vilgax Attacks)