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 |
| Directing | Shaun Cashman | Director |
| Crew | Maxwell Atoms | Creator |
| Production | Shaun Cashman | Supervising Producer |
| Writing | Maxwell Atoms | Writer |
| Production | Maxwell Atoms | Executive Producer |
| Production | Brian A. Miller | Executive Producer |
| Production | Jennifer Pelphrey | Supervising Producer |
| Production | James Silverman | Associate Producer |
| Sound | Drew Neumann | Music |
| Editing | Illya Owens | Editor |
| Art | Maxwell Atoms | Art Direction |
| Production | Kris Zimmerman | Casting |
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