Grey Matterzarro is the Omnitrix's DNA sample of a Galvan from the planet Galvan Prime. Grey Matterzarro's design was created by Andre Prates.
Grey Matterzarro is a grey-skinned, frog-like, bipedal alien that is only four inches tall with large purple eyes, which have rectangular pupils and a horizontal eyelid on his left eye, and a vertical one on his right eye. He wears a yellow hazmat suit with a black stripe on the middle, with the Omnitrix symbol located on his left glove, which is connected to a pack on the back. He also wears a purple gas mask.
Powers and Abilities
Grey Matterzarro'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 Matterzarro's intellect serves as a problem solver and analytical help in difficult situations. This allows Grey Matterzarro to think more strategically when brute force is inefficient. In fact, Grey Matterzarro is smart enough to know how to unlock the original Omnitrix's Master Control.
Grey Matterzarro's brain capacity makes Ben smarter about things he's never even seen before, like Kraab's alien circuitry. Grey Matterzarro can sometimes manipulate living things by stimulating certain parts of their nervous system if such beings can be controlled by external stimuli. Grey Matterzarro's size allows him to squeeze into small spaces and can climb walls due to microscopic pads on his skin. He also has sharp teeth and his slimy skin makes him difficult to grab.
Grey Matterzarro is amphibious and has gills. Grey Matterzarro 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 Matterzarro'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 Matterzarro as a chew toy or food to them.
Despite possessing immense intelligence, Grey Matterzarro can still make miscalculations. According to himself, Grey Matterzarro sometimes does not know what he is talking about and he does not know everything, as seen when he did not know (at first) which galaxy his species is from.
Being a Galvan, Grey Matterzarro would be vulnerable to his natural predator, the Omnivoracious, if the latter's species was not extinct.