Grey Matter is a small, frog-like humanoid with grey skin and big green eyes. Grey Matter wears a green, white, and black chest plate attached to a body suit down to the thighs with green and black gloves, as well as black strappings.
The Omnitrix symbol is located on his back.
- High Intelligence- Grey Matter has a very high intelligence, allowing Ben to think more critically and logically in this form. Grey Matter's brain capacity makes Ben smarter about things he's never even seen before
- Technological Skills- Grey Matter works very well with machines, and can dismantle and build things as he pleases.
- Small Size- Grey Matter is small, which allows him to get through or inside places that most larger species cannot.
- Wall Scaling- Grey Matter's microscopic pads on his skin allow him to climb walls.
- Enhanced Jumping- Grey Matter can jump several times his height to get to high places.
- Universal Translation- Grey Matter has been shown to be able to understand complex and even foreign languages just by hearing them.
- Small Size- Grey Matter's small size can make it hard for him to fight in certain situations.
- Omnivoracious- The Omnivoracious is a Galvan's natural predator.
- Fragile Body- Grey Matter's body is not very durable, being weak to even the basic of attacks from most species larger then him.
In Chapter 2: The Lonely Ghost (Page 3), Grey Matter was in Ben's flashback along with the other original 10.
- Chapter 2: The Lonely Ghost (first appearance, flashback)
- Grey Matter, along with other Galvans, has two brains. One for basic activities and the other for knowledge and skills.
- Grey Matter's DNA source did not come from Azmuth nor Albedo.