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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.[CN 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. Grey Matter's mind is able to generate energies that lead to accelerated synaptic activity.[DR 1] 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.

Despite his small size, Grey Matter is durable enough to withstand being throw against a wall.[1] He is also strong enough to carry a fork with both of his hands.[2]

Grey Matter is capable of breathing underwater thanks to his gills,[3] making him amphibious.


Grey Matter's small stature makes him ill-suited for physical battle,[3] 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.

Grey Matter is vulnerable to fire.[4]

Grey Matter can be easily thrown and lifted by species with as much or more strength than a Chimera Sui Generis.[4]

Because he is light, Grey Matter can easily be blown back by strong winds.[5]


Ben 10


Ben 10

Season 1

Season 2

Season 5


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
Portuguese (Br) Massa Cinzenta From the original English name
Russian Гуманоид From гуманойд, humanoid
Spanish (HA) Materia Gris From the original English name


  • Grey Matter's outfit is modelled after the one worn in the original series, but with the white portion recolored green to match the outfit worn in Omniverse.
  • Despite being replaced with Slapback beginning in Season 3, it was hinted by Duncan Rouleau that Grey Matter would return in the future,[DR 2] foreshadowing his appearance in Ben Gen 10.
    • Ben could also regain access to Grey Matter, given how he has learned how to access the entire cache of Omnitrix aliens by cycling in new chambers from Azmuth.[DR 3][6]
    • Had Grey Matter appeared in Season 4, his Omni-Kix and Omni-Naut forms would both resemble big mech suits.[DR 4][DR 5]
  • Grey Matter is Montserrat Hernandez's favorite alien.[MH 1]
  • It's implied that Grey Matter was added back to the active playlist during Ben Gen 10, as his DNA pod can be seen briefly in the loading chamber while Rex Salazar was removing his nanites from the Omnitrix.

See Also


Cartoon Network India

Crew Statements

Duncan Rouleau

Montserrat Hernandez

Introduced in Season 1 CannonboltDiamondheadFour ArmsGaxGrey MatterHeatblastOverflowStinkflyUpgradeWildvineXLR8
Introduced in Season 2 RathShock Rock
Introduced in Season 3 HumungousaurSlapback
Introduced in Season 4 GoopJetrayWay Big
Introduced in Season 5 Alien XBig ChillBloxxBuzzshockChromastoneRipjawsSpidermonkeySurge
Omni-Enhanced Aliens CannonboltDiamondheadFour ArmsGrey MatterHeatblastOverflowStinkflyWildvineXLR8
Omni-Kix Aliens CannonboltDiamondheadFour ArmsHeatblastHumungousaurJetrayRathShock RockSlapbackXLR8
Omni-Naut Aliens HeatblastJetrayHumungousaurShock Rock
Fusion Aliens Amalgam AlienAmalgam BenGrey ArmsXLRArmBlastDiamondHeat
Non-Canon Aliens Banana AlienBlack Hat AlienHotdawgMole-StacheScooter Alien
Non-Canon Fusion Aliens Omnitrix Glitch FusionDiamondhead-Humungousaur FusionRath ArmsShock Blast