Ben 10 Wiki
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Space Slime is an unknown life form that made its first appearance in That's The Stuff.


It appears as a highly viscous purple fluid. When transformed into another life-form, the life-form appears to have purple eyes.


It is extremely aggressive, when it prepares to attack it produces grunts and bristles even if it is transformed.


Not much is known where it came from, it leaves a bottle and finds Ben and transformed into Grey Matter. The vicious material changed shape adapting the appearance of Grey Matter, beating it in combat, and locking him in a room. Shortly it meets Gwen and Grandpa Max and confuses it for Ben until it decides to copy their appearances. When Ben returns as Omni-Enhanced Four Arms, the slime shape-shifts into him as well, then Ben turns into Omni-Enhanced Diamondhead in order to defeat it as soon as he discovers its weakness.

Powers and Abilities

It is capable of shapeshifting in a type of organic life, if someone looks at it, it will copy the foe's strength and size. It can also pass through small pieces.


The slime will deteriorate when surrounded by mirrors and revert to its original form. As Omni-Enhanced Four Arms, it was vulnerable to the real deal's Fulmini energy, which it lacks.


Ben 10

Season 2


  • The Space Slime shares similarities with a Lenopan, from the Classic Timeline even at one point turning purple, the Lenopan's standard color.
  • Kelly Turnbull pitched an episode for season 4 featuring the Space Slime in which it is contained in wherever Phil stores his alien tech before being taken over by the Forever Knight helmet. However, the episode was scrapped because the series was winding down by that point and the episode itself was not in the cards.[KT 1]


Kelly Turnbull

Sapient Species
AerophibianAmperiAntrosapienAppoplexianArachnichimpArburian PelarotaCascanCelestialsapienChimera Sui GenerisCrystalsapienEkoplektoidEctonuriteFloraunaFulminiGalvanGalvanic MechamorphHumanIckthyperambuloidIncurseanKineceleranLepidopterranLoboanNecrofriggianNosedeenian OpticoidPetrosapien (Surface Petrosapiens • Subsapiens)Piscciss PremannPiscciss VolannPolymorphPyroniteSegmentasapienSotoraggianTetramandTo'kustarVaxasaurianVulpimancerXerge
Unnamed Sapient Species
Bashmouth's SpeciesSpace SlimeTentacle Sentinels
Non-Sapient Species
Arburian CarcharodonPhase ParasitesHydromanderLavadrexMushroarStinkwormTongue Beetle
Unnamed Non-Sapient Species
Cascareau's LeviathanGalvan ParasitesKhoros' BehemothsKinet's Molluscarx