Underfist: Halloween Bash (2008)
- HD 1080
- Runtime: 61m.
- Status: Released
0
- Languages: en
- Director: Shaun Cashman
- Stars: Grey DeLisle, Greg Eagles, Richard Steven Horvitz, Vanessa Marshall, Diedrich Bader
- keywords: halloween, grim reaper, spin off
- Production_studio: Cartoon Network Studios
- The Underfist: Halloween Bash is featured in the top rankings of 2008
- #15 in Top Animation of 2008
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.