![Fan Casting Richard Horvitz as Grey Matter in Ben 10: Race Against Time (Animated Version) on myCast Fan Casting Richard Horvitz as Grey Matter in Ben 10: Race Against Time (Animated Version) on myCast](https://assets.mycast.io/characters/grey-matter-316273-normal.jpg?1571517352)
Fan Casting Richard Horvitz as Grey Matter in Ben 10: Race Against Time (Animated Version) on myCast
![Ben Tennyson on Twitter: "Race Against Time is a great movie, but did anyone else notice that Grey Matter's character was different from the OG series? He acted like a mischievous gremlin Ben Tennyson on Twitter: "Race Against Time is a great movie, but did anyone else notice that Grey Matter's character was different from the OG series? He acted like a mischievous gremlin](https://pbs.twimg.com/media/FAqlzefWEAMKoqg.jpg)
Ben Tennyson on Twitter: "Race Against Time is a great movie, but did anyone else notice that Grey Matter's character was different from the OG series? He acted like a mischievous gremlin
![Grey Matter Fan Casting for Ben 10: Race Against Time (Animated Version) | myCast - Fan Casting Your Favorite Stories Grey Matter Fan Casting for Ben 10: Race Against Time (Animated Version) | myCast - Fan Casting Your Favorite Stories](https://assets.mycast.io/posters/ben-10-against-time-animated-version-fan-casting-poster-17953-large.jpg?1571515446)