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.
Unfortunately the movie Underfist: Halloween Bash is not yet available on Netflix. Follow us on Facebook to see when Underfist: Halloween Bash becomes available on Netflix!
| Art | Maxwell Atoms | Storyboard Artist |
| Production | Brian A. Miller | Executive Producer |
| Art | Maxwell Atoms | Art Direction |
| Directing | Shaun Cashman | Director |
| Editing | Illya Owens | Editor |
| Production | James Silverman | Associate Producer |
| Writing | Maxwell Atoms | Writer |
| Production | Maxwell Atoms | Executive Producer |
| Production | Jennifer Pelphrey | Supervising Producer |
| Crew | Maxwell Atoms | Creator |
| Sound | Drew Neumann | Music |
| Production | Shaun Cashman | Supervising Producer |
| Production | Kris Zimmerman | Casting |
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