Grey Matter
General Information
Species Galvan
Home World Galvan Prime
Body Humaoid Frog
Powers and Abilities
Abilities Super Intelligence
Slimy Skin
Suction Cup Fingers
Enhanced Jumping
Enhanced Dexterity
Enhanced Agility
Voice Actor Eric Bauza
First Appearance Washington B.C.
Grey Matter is the Omnitrix's DNA sample of a Galvan from Galvan Prime.


Grey Matter is a grey frog like alien. He is about 6 inches tall. He wears a green jumpsuit with a black collar and belt. He wears black gloves with a green rectangle and has the Omnitrix on his back.


  • Grey Matter has a superior intellect and can create almost anything from spare parts and know the function of any device at a glance.
  • His size allows him to squeeze into small spaces.
  • He can climb walls due to suction cups on his skin.
  • Grey Matter's skin is slimy so he is difficult to grab and he has sharp teeth.
  • He has enhanced strength for his size
  • He is amphibious.


Grey Matter's size makes him nearly useless in physical battle so he has to outwit his opponent. Large animals can see Grey Matter as food or toy making them a problem.


Ben 10

  • Washington B.C.
  • Hunted
  • Secrets
  • Truth
  • Gwen 10 (by Gwen)
  • Grudge Match
  • Ultimate Weapon
  • They Lurk Below
  • Ghostfreaked Out
  • Back With a Vengeance (x8)
  • Midnight Madness
  • Merry Christmas (x2)
  • The Unnaturals
  • Be Afraid of the Dark
  • Perfect Day
  • Ben 10: Secret of the Omnitrix
  • Ben 10: Destroy All Aliens


  • Snack Break

Ben 10: Omniverse

  • Have I Got a Deal For You
  • So Long, and Thanks For All the Smoothies
  • Of Predators and Prey: Part 2
  • Rad