|Home World||Galvan B|
|Powers and Abilities|
|Voice Actor||Tara Strong|
Ben turns grey and his head changes shape and gets smaller.
Powers and Abilities
- Enhanced Intelligence
- Enhanced Agility
- Enhanced Flexibility
- Enhanced Jumping
- Wall Crawling
- Sharp Teeth
- Underwater Breathing
- Prehensile Tongue
- Small size
In Brain Power, Gurey Matter studied, did homework and thought.
Grey Matter is named after grey matter, one of the components of the central nervous system.
- Grey Matter is Ben's smartest alien.
- Grey Matter is smart enough to unlock the prototype Omnitrix's Master Control.
- 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.
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