ZIM / SIR Walla (voice)
GIR / Old Man (voice) (as Rosearik Rikki Simons)
Dib Membrane / SIR Walla (voice)
Gaz Membrane (voice)
Ms. Bitters (voice)
Almighty Tallest Red / Megadoomer Computer (voice)
Almighty Tallest Purple (voice) (as Kevin Hamilton McDonald)
Zita (voice)
Melvin / Random Kid (voice)
Assistant #1 / Assistant #2 (voice)
Invader Tenn / Spuddy (voice)
Smikka Smikka Smoogoo / Buck (voice)
Gretchen (voice)
Countess von Verminstrasser (voice)
Neighbor / Communications Officer (voice)
Chuck / Cyborg (voice) (as Mr. Scolex)