Underfist: Halloween Bash (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.
- Release Date: 2008-10-12
- Runtime: 1h 1min
- Production Company: Cartoon Network Studios
- Production Country: United States of America
- Director: Shaun Cashman
