Irwin, Hoss Delgado, Jeff the Spider, Fred Fredburger, and General Skarr from the "Grim Adventures of Billy and Mandy" team up to fight an evil candy army from the Underworld on Halloween.
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Trailer
Underfist: Halloween Bash promo (2008)
Cast
Grey DeLisle
Mandy / Aunt Sis / Kid / Ike (voice)
Greg Eagles
Grim / Sperg / Giant Candy Bar (voice)
Richard Steven Horvitz
Billy / Harold / Pumpkin / Trick-or-Treater Eater (voice)
Vanessa Marshall
Irwin / Hoss's Mom (voice)
Diedrich Bader
Hoss Delgado (voice)
Armin Shimerman
General Skarr / Candy Skeleton / Rat / Creepy Gnome (voice)
C.H. Greenblatt
Fred Fredburger (voice)
Maxwell Atoms
Jeff the Spider (voice)
Phil LaMarr
Dracula / Grandmama / Bougersnatch (voice)
Rachael MacFarlane
Mindy (voice)
Dave Wittenberg
Bun-Bun / Trick-or-Treater Eater #1 / Jimbo (voice)
Dan Gilvezan
Confic / Humicun (voice)
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