|Home Planet||Galvan Prime|
|Abilities|| Enhanced Intelligence|
|Voice Actor||Eric Bauza|
Ben as Grey Matter
He looks like a humanoid frog with big yellow-green eyes, but in Ultimate Alien, he has the normal plain green eyes. He appears to be wearing a suit of some kind and has a stripe on his head that starts from the back of his head to his forehead, similar to Four Arms. He has a large (for him) Omnitrix symbol on his back, but it's on his chest in UA.
In The New Omniverse, he looks like his 11 year old appearance in Omniverse, except the black is now green, and the white is now black.
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, (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, and he was able to break a coolant pipe to freeze the Vreedle Brothers.
Grey Matter is amphibious and has gills.
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.
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.