|Home World||Galvan Prime|
|Powers and Abilities|
|First Appearance||Life of a Vulpimancer|
Grey Matter is a gray-skinned, frog-like, bipedal alien, only six inches tall with large green eyes with little minus sign like pupils. He wears a white jump suit with a black stripe going down it.
- In Ren X, he has a slightly bigger mouth like most of the other aliens, and seems to have some sort of Galvanic spacesuit on, although unremovable (for some reason). He has a bit smaller eyes, and wears "shoes" attached to his spacesuit. He still has the omnitrix symbol on his back.
Grey Matter's size belies his great calculative and technical intellect. He can create almost anything from spare parts and know the function of any device at a glance. Grey Matter's intellect serves as a problem solver and analytical help in difficult situations.Grey Matter can sometimes manipulate living things by stimulating certain parts of their anatomy, if such beings can be controlled by external stimuli.Grey Matter's size allows him to squeeze into small spaces and he can climb walls thanks to tiny suction cups on his skin. He also has sharp teeth and his slimy skin makes him difficult to grab. He is stronger than he looks.He is also amphibious and has gills.
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 food or toy.
- In Life of a Vulpinmancer, He was used to drive a spacedisc and deactive and remove a Vulpimanted-Stimulator from Zon.
- In T-Hawk, (randomized transformation) he removes a wheel from a T-Hawk's truck
- In Small is best, he defeats a Tokustar (unbelievable until you watch the episode)