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|Home planet:|| Galvan Prime (destroyed)|
Galvan Mark II
|Abilities:|| Super Intelligence|
Powers and AbilitiesEdit
Ben 10 and Ultimate AlienEdit
- Grey Matter first appeared in Washington B.C., Grey Matter was searching in cereal boxes for a Gold Sumo Slammer card.
- In Hunted, Grey Matter defeated Kraab and Sixsix.
- In A Small Problem, the Omnitrix malfuntioned, trapping Ben as Grey Matter for most of the episode. Grey Matter snuck onto a water slide and got captured by Howell Wainright.
- In Secrets, Grey Matter appeared when the Omnitrix malfuntioned. He defeated one of Vilgax's drones.
- In Truth, Grey Matter defeated a Null Guardian.
- In Grudge Match, Grey Matter defeated one of Slix Vigma's drones.
- In Ultimate Weapon, Grey Matter snuck into a house, let Gwen and Max come in and opened a safe.
- In They Lurk Below, Grey Matter saved a drowning man.
- In Ghostfreaked Out, Grey Matter appeared.
- In Back With a Vengeance, Grey Matter appeared 8 times.
- In Midnight Madness, Grey Matter was hypnotized into being Gwen's slave.
- In Merry Christmas, Grey Matter accidently destroyed the Rustbucket's air conditioner and later destroyed the Jingleator.
- In The Unnaturals, Grey Matter appeared.
- In Be Afraid of the Dark, Grey Matter escaped Zs'Skayr and built a sungun.
- In Perfect Day, a dream Grey Matter defeated a mutated dream Cash and J.T.
- In Ken 10, an alternate timeline Grey Matter was used by Kenny to escape his room and later, to unlock his Omnitrix's Master Control.
- In Ben 10: Secret of The Omnitrix, Grey Matter defeated Dr. Animo.
- In Ben 10: Race Against Time, an alternate timeline Grey Matter caused trouble in a diner.
- In Snack Break, Grey Matter failed to retreive his snack in a vending machine.
- In Ben 10,000 Returns, Grey Matter was re-unlocked by Ben 10,000.
- In Double or Nothing, Negative Grey Matter explains that he won't attack Ben, Gwen or Kevin anymore. Until it is revealed Albedo can only be Negative Grey Matter for about second before reverting back.
Ben 10 UltiVerseEdit
- Washington B.C. (first appearance)
- A Small Problem (accidental transformation; selected alien was Ripjaws)
- Truth (accidental transformation; selected alien was Four Arms)
- Grudge Match
- Ultimate Weapon
- They Lurk Below (accidental transformation; selected alien was Ripjaws)
- Ghostfreaked Out
- Back With a Vengeance (8x) (last time was an accidental transformation)
- Midnight Madness (under hypnosis)
- Merry Christmas (2x) (last time the selected alien was Four Arms)
- The Unnaturals (accidental transformation; selected alien was XLR8)
- Be Afraid of the Dark (acciendental transformation)
- Perfect Day (accidental transformation; selected alien was Heatblast)
- Ken 10 (used by Kenny Tennyson)
- Ben 10: Secret of The Omnitrix (accidental transformation; selected alien was Stinkfly)
- Ben 10: Race Against Time (accidental transformation; selected alien was Four Arms) (Race Against Time Timeline version)
- Snack Break
Ben 10: Ultimate AlienEdit
- Double or Nothing (used by Albedo)
- Grey Matter has the most accidental transformations.
- As shown in Ken 10, Grey Matter is smart enough to unlock the Omnitrix's Master Control.
- Grey Matter is the same species as the Omnitrix's creator, Azmuth.
- Grey Matter is Ben's second smallest form, first is Nanomech.
- Grey Matter has the most appearances in Back With a Vengeance. This is ironic considering Ben dislikes Grey Matter for fights. However, most times Ben used Grey Matter on purpose were for escaping.
- When talking, Grey Matter doesn't always know what he is talking about.
- It was revealed that neither Azmuth or Albedo were where Azmuth got Grey Matter's Galvan DNA sample from.
- Grey Matter was the only seen alien with the Omnitrix symbol on his back.