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Grey Matter is a Galvan from the planet Galvan Prime. He is Ben's 5th transformation who appeared first in [[Washington B.C.]]
Being very small grey matter is able to go through the smallest of spaces giving him an advantage. He is also the smartest being in 5 galaxies so he can create almost anything or destroy anything.
He first appeared in the episode Washington B.C. where he is looking for the gold [[Sumo Slammers ]]card in the [[M-Mart]]. After he makes a mess he leaves his cousin Gwen getting in trouble.
[[Video:Ben 10 Greymatter transformation|thumb|