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Grey Matter is the Omnitrix's DNA sample of a Galvan from the planet Galvan Prime.


Grey Matter is a grey-skinned, frog-like, bipedal alien who is only 5 inches tall.[1] He has large, orange eyes, with rectangular pupils. He wears a green jumpsuit with a black stripe going down the middle of the chest, which connects to black rings around his neck and waist, black rings around his wrists, and black coloring from the knees down.

Grey Matter wears the Omnitrix symbol on his back.

Powers and Abilities

Grey Matter's small size belies his great calculative and technical intellect. He can create complicated machines from spare parts, understand the function of any device at a glance, and make sophisticated repairs to complex machines. Grey Matter's intellectual and analytical prowess aids him in succeeding his opponents in difficult situations. In conjunction, his intelligence makes him a natural problem solver, enabling him to think more strategically when brute force is inefficient.

Grey Matter can sometimes manipulate living things by stimulating certain parts of their nervous system, if such beings can be controlled by an external stimulus.

Grey Matter's size allows him to squeeze into small spaces and can climb walls due to tiny suction cups on his skin. He also has sharp teeth and his slimy skin makes him difficult to grab.

Grey Matter is amphibious and has gills.


Grey Matter's small stature makes him ill suited for physical battle, so he must outsmart his enemies in a fight. Animals, such as cats and dogs, can be troublesome, as Grey Matter may appear to them as a plaything or a small snack.


Ben 10


Ben 10

Season 1

Season 2

Video Games

Ben 10

Grey Matter is a playable alien character in the game. He is initially unavailable, but is unlocked towards the end of the The City level.

Grey Matter is equipped with a mechanical backpack that assists him in combat, being able to fire energy blasts and vortices that drag enemies near.

Grey Matter's small size allows him to enter small areas that the rest of Ben's aliens, and Ben himself, are unable to access.

Grey Matter's Ultimate Ability consists of him modifying his backpack to shrink enemies down to a microscopic level, then stepping on them.

Grey Matter is vital for progression on the The City, the The Funhouse, the The Scrapyard and the The Hive levels of the game.

Naming and Translations

Language Name Origin
Russian Гуманоид From гуманойд, humanoid


  • Grey Matter's outfit is a combination of his outfits from the original series and Omniverse.
  • Grey Matter was replaced with Slapback.

See Also


Original Aliens
CannonboltDiamondheadFour ArmsGrey MatterHeatblastOverflowStinkflyUpgradeWildvineXLR8
Introduced in Season 1 Introduced in Season 2 Introduced in Season 3 Introduced in Season 4
Gax RathShock Rock HumungousaurSlapback Jetray
Omni-Enhanced Aliens
CannonboltDiamondheadFour ArmsGrey MatterHeatblastOverflowStinkflyWildvineXLR8
Omni-Kix Aliens
CannonboltDiamondheadFour ArmsHeatblastHumungousaurJetrayRathShock RockSlapbackXLR8
Fusion Aliens Not In The Show Non-Canon
Amalgam BenGrey ArmsXLRArmBlastDiamondHeat Mole-Stache Banana AlienHot Dog AlienOmnitrix Glitch FusionRath ArmsShock Blast

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