Vanessa Marshall
Greg Eagles
Grim (voice)
Richard Steven Horvitz
Billy (voice)
Grey DeLisle
Mandy (voice)
Rachael MacFarlane
Eris (voice)
Diedrich Bader
Phil LaMarr
Judge Roy Spleen (voice)
Billy West
Maxwell Atoms
Jeff the Spider (voice)
Dee Bradley Baker
Worm
Candi Milo
Grim's Mom (voice)
Armin Shimerman
General Skarr
David Warner
Nergal (voice)
Jake Thomas
Nigel Planter
Brian Tochi
Jennifer Hale
Gladys (voice)
Martin Jarvis
Nergal
John Vernon
Dean Toadblatt
Tom Kenny
PPG Narrator/ Bird (voice)
Quinton Flynn
Peter Renaday
Jess Harnell
Frank Welker
Boskov
Dawnn Lewis
Grim's Granny
Jane Carr
Pud'n
Henry Gibson
Lord Pain
'Weird Al' Yankovic
Squid Hat
C.H. Greenblatt
Fred Fredburger (voice)
Debi Derryberry
Nergal Jr.
Tom Kane
Professor Utonium (voice)
John Kassir
Lord Moldybutt
Jay Gordon
Zeus (voice)
Earl Boen
Mark Hamill
Jeff Bennett
Clyde Kusatsu
Jeannie Elias
Malaria
Alan Oppenheimer
Father Time
Keone Young
Kwan Ti
Wayne Knight
Jack O'Lantern
