- James Hetfield - Lorkey (voice)
- James Hetfield - Fan #1 (voice)
- James Hetfield - Sniper (voice)
- James Hetfield - Troll (voice)
- Kirk Hammett - Smoked Fingers fan (voice)
- Kirk Hammett - Queen of Denmark (voice)
- Kirk Hammett - Barkeep (voice)
- Jon Schnepp - Additional Voices (voice)
- Jon Schnepp - Dr. Gibbits (voice)
- Jeff Loomis - Mr. Murderface (voice)
- Warrel Dane - Sammy Twinskins (voice)
- King Diamond - The Blues Devil (voice)
- King Diamond - Fast Food Restaurant Manager (voice)
- King Diamond - Ronald von Moldenberg (voice)
- King Diamond - Employee 421 (voice)
- George Fisher - Metal Masked Assassin (voice)
- George Fisher - Angry Customer (voice)
- George Fisher - Hippie (voice)
- George Fisher - Football Player (voice)
- Laura Silverman - Valerie Vransinn / Grishnack's Assistant (voice)
- Laura Silverman - Rebecca Nightrod (voice)
- Andy Richter - J.F. Amarth (voice)
- Mike Keneally - Doctor (voice)
- Laraine Newman - News Anchor / Woman (voice)
- Laraine Newman - Pickles' Mom (voice)
- Laraine Newman - News Reporter / Grandma / GMILF (voice)
- Laraine Newman - TV Host / Sucubboso Explosionite (voice)
- Laraine Newman - Nathan's Grandma (voice)
- Laraine Newman - Serveta Skwigelf / Molly / Rose Explosion (voice)
- Laraine Newman - Liz Bane (voice)
- Laraine Newman - Newscaster (voice)
- Devin Townsend - Teenage Fan at Juice Joint (voice)
- Devin Townsend - Additional Voices (voice)
- Silenoz - Bobby (voice)
- Silenoz - Prison Inmate (voice)
- Silenoz - Yaneemango Indian (voice)
- ICS Vortex - Mitch (voice)
- ICS Vortex - Yaneemango Indian (voice)
- Frankie Ingrassia - Rachel / Sucubboso Explosionite (voice)
- Angela Gossow - Lavona Sucubboso (voice)
- Angela Gossow - Lavona Sucubboso / Sucubboso Explosionite (voice)
- Bill Braudis
- Brendon Small
- Keith Crofford
- Tommy Blacha
Brendon Small interpreta a Skwisgaar Skwigelf / Pickles the Drummer / Nathan Explosion en la serie.
Tommy Blacha interpreta a Toki Wartooth / William Murderface (voice) en la serie.
Mark Hamill interpreta a Senator Stampingston / Mr. Selatcia (voice) en la serie.
Victor Brandt hace el papel de General Crozier / Cardinal Ravenwood (voice).
Malcolm McDowell hace el papel de Vater Orlaag (voice).
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