Richard Steven Horvitz
3 titles in the 𝕏TVDb catalog
Ben 10
2005
as Grey Matter (voice)
The Grim Adventures of Billy and Mandy
2001
as Billy (voice)
Invader ZIM
2001
as Zim (voice)
3 titles in the 𝕏TVDb catalog
Ben 10
2005
as Grey Matter (voice)
The Grim Adventures of Billy and Mandy
2001
as Billy (voice)
Invader ZIM
2001
as Zim (voice)