Richard Steven Horvitz
Zim
/
ZIM
/
Invader Zim
/
Old Man
/
Actor
/
Animatronic Horrors
/
Baby
/
Boy
/
Business Man
/
Crowd Choir
/
Delivery Man
/
Driver
/
Hugh Monstro
/
Invader ZIM
/
Irken
/
Off Screen Voice
/
Puppets
/
Radio
/
SIR Walla
/
Scientist
/
Security Guard #2
/
Slaves
/
TV Voice #4
/
Video Kids
(27 episodes, 2001-2003)