Ben 10 Planet

Grey Matter

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


Ben as Grey Matter

Grey Matter is a grey skinned, frog-like, bipedal alien that is only four inches tall with large green eyes, which have rectangular pupils and horizontal eyelids. He wears a white jumpsuit with a thin vertical black stripe going down it (a larger version of the same stripe exists on his head, in-between his eyes).

In the original series, Grey Matter wore the Omnitrix symbol on his back and his eyes were yellowish-green. He spoke with a high-pitched voice.

In Ultimate Alien, Grey Matter wore the Ultimatrix symbol on his chest.

In Omniverse, 11 year old Grey Matter looks exactly the same as the original, but his collar is now black. His skin tone is also slightly different.

16 year old Grey Matter now has a green jumpsuit with a black belt. His suit collar is now black, and the stripe on his head and jump suit are no longer present. He wears black, fingerless gloves with a green rectangle on the back. His neck is slightly longer. His Omnitrix symbol continues to be present on his back, and his voice is slightly deeper.

Gwen as Grey Matter

Gwen as Grey Matter has Gwen's hair and more oval shaped eyes, with much smaller pupils. She wears a light blue jump suit with dark blue sleeves. She wears the Omnitrix symbol on her back. She also lacks the stripes Ben's form has.

Powers and Abilities

Grey Matter's intelligence

Grey Matter using his technical intelligence

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, (such as a warp-drive engine). Grey Matter's intellect serves as a problem solver and analytical help in difficult situations. This allows Grey Matter 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 external stimuli.

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 appears to be stronger than he looks, as he was strong enough to move a cleaner's bucket with mops in it in Ultimate Weapon, and in So Long, and Thanks for All the Smoothies, he was able to break a coolant pipe to freeze the Vreedle Brothers.

According to Derrick J. Wyatt, Grey Matter is amphibious and has gills.[1]

Grey Matter has a long prehensile tongue, owing to his insectivore nature. As a Galvan, he also possesses a 'pre-brain' which deals with all basic bodily functions.

Grey Matter was able to understand Pyxi's speech in Rad.


Grey Matter's small size makes him unsuitable for physical battle, so he must outsmart his enemies in a fight. Animals like dogs and cats can be a problem, as they may see Grey Matter as a chew toy or food to them.


  • Grey Matter first appeared in Washington B.C.. Grey Matter searched through in cereal boxes for a Golden Sumo Slammer card.
  • In Hunted, Grey Matter defeated Kraab and Sixsix.
  • In A Small Problem, the Omnitrix malfunctioned, trapping Ben as Grey Matter for most of the episode.
  • In Secrets, Grey Matter defeated one of Vilgax's drones.
  • In Truth, Grey Matter defeated a Null Guardian.
  • In Grudge Match, Grey Matter defeated one of Slix Vigma's drones.
  • In Ultimate Weapon, Grey Matter snuck into a building, let Gwen and Max come in and opened a safe.
  • In They Lurk Below, Grey Matter saved a drowning man.
  • In Ghostfreaked Out, Grey Matter escaped Zs'Skayr.
  • Grey Matter appeared six times in Back with a Vengeance. Firstly, he appeared when Ben unlocked the Master Control. Then, he appeared in a photo. Grey Matter later tried to escape from Vilgax and Kevin. In the Null Void, Grey Matter escaped Kevin on a Null Guardian, then tried to escape a Null Guardian. At the end of the episode, Ben accidentally transformed into Grey Matter, realizing that the Master Control is once again locked.
  • In Midnight Madness, Grey Matter was hypnotized into being Gwen's slave.
  • In Merry Christmas, Grey Matter accidentally destroyed the Rustbucket's air conditioner and later destroyed the Jinglelator.
  • In The Unnaturals, Grey Matter stopped some thieves from stealing the Liberty Bell and won an MP3 player in a contest.
  • In Be Afraid of the Dark, Grey Matter escaped Zs'Skayr and built a Sun Gun.
  • In Perfect Day, In a dream, Grey Matter defeated a mutated Cash and J.T..
  • In Ben 10: Secret of the Omnitrix, Grey Matter defeated Dr. Animo.
  • In Ben 10: Destroy All Aliens, Grey Matter escaped from Retaliator.
Gwen 10
  • In Gwen 10, Grey Matter was chased by a raccoon.
  • In Ken 10, Ken as Grey Matter escaped his room. Later, Ken as Grey Matter unlocked his Omnitrix's Master Control.

  • In Snack Break, Grey Matter failed to retrieve his snack in a vending machine.

  • In Double or Nothing, it is revealed Albedo can only be Negative Grey Matter for about a second before reverting.

No Watch Ben


Gwen 10


No Watch Ben

Cartoon Network Action Packs
  • Ole!
  • Techno Zombies
  • Blast from the Past
  • Space Camp and Beyond
  • Wanted (Captured! and The Once and Future Ben)

Naming and Translations

Language Name Origin
Arabic جراي ماتر From ماتر, matter, and جراي grey
Bulgarian Сиво Вещество (Civo Veshtestvo) From сиво (civo), grey and вещество (veshtestvo), matter
Chinese 小奇兵 From (Xiǎo), little, and 奇兵 (Qí Bīng), soldier
Croatian Siva Tvar From siva, grey, and tvar, matter
Danish Grå Substans From Grå, grey, and Substans, matter
Dutch Grijze Massa From grijze, grey, and massa, matter
Finnish Harmaa Haitta From harmaa, grey, and haitta, disadvantage
French Le Tétard Gris From gris, grey, and tétard, tadpole
Greek Γκρίζα Ύλη From Γκρί, gray, and ύλη, matter
Hebrew תא אפור From תא, cell, and אפור, grey
Hungarian Ragacska From ragacs, putty
Italian Materia Grigia From materia, matter, and grigia, grey
Japanese グレイマター From グレイ (gurei), grey, and マター (matā), matter
Korean 미니그레이 From 미니, mini, and 그레이, grey
Norwegian Gråbarken From grå, grey, and barken, bark
Polish Szara Materia From szara, grey, and materia, matter
Portuguese (Br) Massa Cinzenta From massa, mass, and cinzenta, grey
Romanian Cerebel
Materie cenusie
From cerebel, cerebellum
From materie, matter, and cenusie, grey
Russian Гуманоид (Gumanoyd) From Гуманойд (gumanoyd), humanoid
Serbian Сива Материја (Siva Materija) From сива (siva), grey, and материја (materija), matter
Spanish (HA) Materia Gris From materia, matter, and gris, grey
Spanish (Spain) Materia Gris From materia, matter, and gris, grey
Swedish Grå Dvärgen From grå, grey, and dvärgen, dwarf
Turkish Gri Madde From gri, grey, and madde, matter


Grey Matter is named after grey matter, one of the components of the central nervous system.


  • According to Derrick J. Wyatt, Grey Matter is Ben's smartest alien.[2]
  • As shown in Ken 10, Grey Matter is smart enough to unlock the Prototype Omnitrix's Master Control.
  • It was revealed that neither Azmuth nor Albedo was the source of Grey Matter's DNA sample.
  • A running gag in the original series was that when Ben selected an alien with enhanced strength, he got Grey Matter instead.
  • Grey Matter and Feedback are the only aliens with their own theme song.


See Also

Ben 10 Aliens
Introduced in Ben 10
ArctiguanaBlitzwolferBuzzshockCannonboltDiamondheadDittoEye GuyFour ArmsFrankenstrikeGhostfreakGrey MatterHeatblastRipjawsSnare-ohStinkflyUpchuckUpgradeWay BigWildmuttWildvineXLR8
Introduced in Ben 10: Alien Force Introduced in Ben 10: Alien Swarm
Alien XBig ChillBrainstormChromastoneEcho EchoGoopHumungousaurJetrayLodestarRathSpidermonkeySwampfire Nanomech
Introduced in Ben 10: Ultimate Alien Introduced in Heroes United
AmpFibianArmodrilloChamAlienClockworkEatleFasttrackJury RiggNRGTerraspinWater Hazard Shocksquatch
Introduced in Ben 10: Omniverse
AstrodactylAtomixBall WeevilBloxxBullfragCrashhopperFeedbackGravattackGutrotKickin HawkMole-StachePesky DustThe WorstToepickWalkatroutWhampire
Ultimate Forms
Big ChillCannonboltEcho EchoHumungousaurSpidermonkeySwampfireWay BigWildmutt
Future Aliens Fusion Aliens See Also
SandboxShellheadSnakepitSpitter Diamond MatterHeat JawsStink Arms Decagon VreedleRocksSquidstrictorThriller WhaleVentrilosquid
PortalerAntigraviteslaBob the BlobPlantapocalypse

Start a Discussion Discussions about Grey Matter

  • Grey matters DNA origin

    13 messages
    • Have you created any wikis
    • I have
  • Default DNA Galvan

    8 messages
    • Stryzzar wrote:The Omnitrix probably damaged Albedo's actual DNA, as well as every alien form he can turn into, which is why even his Gal...
    • Oh it's a stabilizer? Right, that makes sense.