Jack Black
Dethklok's Original Manager / Fat Fan (voice)
Mark Hamill
Mr. Salacia / Senator Stampingston (voice)
Mike Keneally
Toki Wartooth (voice)
Malcolm McDowell
Vater Orlagg (voice)
Brendon Small
Nathan Explosion / Skwisgaar Skwigelf / Pickles / William Murderface / Young Toki Wartooth / Charles Offdensen / Ishnifus Meaddle / Edgar Jomfru / Eric Jomfru / Magnus Hammersmith / Dr. Rockzo (voice)
Victor Brandt
General Crozier (voice)
Raya Yarbrough
Abigail Remeltindrinc / Old Groupie (voice)
Ulrich Wild
Bald Fan (voice) (uncredited)
George Fisher
Metal Masked Assassin (voice)