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34497a3fe0ef52949a1ba8e99894ed69 This article belongs to the Classic Continuity

Protosts are a gelatinous alien species from the moon Myceto.[pop-up 1][1]


Protosts are pink blob-like aliens with a pair of antennae on their head and three yellow pupil-less eyes with black stripes running down the back and sides.

Only male Protosts have been seen, so it is unknown what female Protosts look like.


Protosts have their own equivalent of Human coffee: an opaque white liquid with small alien fish swimming around.[pop-up 2][1]


The Protosts are responsible for making the Null Void Containment Eggs that Ben 10,000 would use in the future.[pop-up 3][2]

Powers and Abilities[]

Protosts bodies made of liquid slime, which they can control and shapeshift at will. They can morph and take on the shape of a blob for faster movement; stretch or elongate parts of their body; and slip through small spaces. They can even spawn tentacles to grab or interact with things.[1]

Protosts can envelop people or objects in their slime to shield them from outside attacks, or to shield the outside from dangerous objects, as Gluto did to protect Gwen.[1]

Protosts have exceptional healing capabilities, and are able to regenerate completely from any subdivision of themselves, no matter how small, as long as that piece of them doesn't evaporate first.[pop-up 4] Its only flaw is that they seem to take a while to completely regenerate their entire bodies.[1]

Protosts are very strong, as Gluto was able to wrestle with Vilgax, pick up and toss his bioids with one tentacle, and rip them in half.[1]

Protosts' gel-like bodies makes them invulnerable to most physical attacks.[pop-up 5][1]

Protosts are very quick and agile when they move as one blob, easily able to overwhelm opponents and dodge their attacks.[1]


2SOTO (1711)

Energy Attack Vulnerability

Protosts are weak to energy attacks.[pop-up 6][1]

Notable Protosts[]


The name Protost is a play on protists, which is any eukaryotic organism (that is, an organism whose cells contain a cell nucleus) that is not an animal, plant, or fungus.


  • Despite having a body made of uniform material, Protosts can still both blush and sweat, as demonstrated by Gluto.[1]
  • A Protosts' multiple limbs allow them to control and pilot vehicles that few other species can.[pop-up 7][1]



Sapient Species AcrosianAerophibianAmperiAnoditeAppoplexianAquarianArachnichimpArburian PelarotaAtrocianBiot-savartianCelestialsapienCerebrocrustaceanChimera Sui GenerisChronosapienChurlCitrakayahConductoidContumeliaCrystalsapienDetroviteDracosianDragonEctonuriteFloraunaGalileanGalvanGalvanic MechamorphGeochelone AeriosGimlinopithecusGourmandHighbreedHulexHuman (Osmosian)IckthyperambuloidIncurseanKineceleranKraahoLenopanLepidopterranLewodanLimaxLoboanLucubraMaxatomarMerlinisapienMethanosianNecrofriggianNemuinaNosedeenianOpticoidOrishanOrmerowonOrthopterranOryctiniPantophagePetrosapienPiscciss PremannPiscciss VolannPlanchakülePolar ManzardillPolymorphProtostPrypiatosian-APrypiatosian-BPugnavorePyroniteRevonnahganderSegmentasapienSlime-BiotSonorosianSotoraggianSphoeroidSplixsonSylonnoidSynthroidTalpaedanTetramandThalassianThep KhufanTo'kustarTransylianUxoriteVaxasaurianVladatVreedleVulpimancerYetiZaroffian
Unnamed Sapient Species Argit'sAstrodactyl'sAtomix'sBall Weevil'sDagger AliensDecka'sEnforcer Alien'sGutrot'sHobble'sInspector 13'sKickin Hawk'sMedic'sMole-Stache'sPakmar'sPickaxe AliensProbity'sRock MonstersSmoothie Vendor'sTack'sTentacle Vendor'sTiny'sToepick'sVulpinic Tortugan
Evolved Sapient Species Evolved AppoplexianEvolved ArachnichimpEvolved Arburian PelarotaEvolved GalileanEvolved GalvanEvolved HumanEvolved MethanosianEvolved NecrofriggianEvolved Polar ManzardillEvolved SonorosianEvolved To'kustarEvolved VaxasaurianEvolved Vulpimancer
Non-Sapient Species Aldebaran BeidafangAnubian BaskurrBuglizardCassiopeian Dream EaterChupacabraCorrupturaCrabdozerDasypodidaeDravekGracklflintHavoc BeastKaosseffexx UltimasauriaKrakkenMammothMicrochipMuroidMycetian Swamp HoppersNight MareNull GuardianOmnivoraciousPallorfangPanuncianPsycholeopterranPterodactylPyroxovoreQuartilloptusRoot SharkSandripperScreegitScrutinSlammoidTime BeastsTyrannosaurus RexVicetopusVolaticus biopsisWigzelian Org BeastXenociteZombie Clown Virus
Unnamed Non-Sapient Species Alien VerminKhoros Reptilian MountLiving MushroomsLiving PumpkinsMucilator'sPiscciss KrakenRobotic Squid AlienSquid MonsterTerroranchula's
Evolved Non-Sapient Species Evolved Panuncian
Non-Canon Sapient Species BasaltCephalod-aeChronianHumpbackusLaurianSool and Gontu's
Non-Canon Non-Sapient Species Cyber SquidMacerootPlant MonsterThornhoundVulpin Serpent