When the Boogey Man causes Grim to lose his powers, rank, and title in the Underworld Court for misusing his powers, he plots to seek out Horror's Hand and take over the world. It's up to Billy, Mandy, Irwin, and Grim to get to Horror's Hand before the Boogey Man does.
| Sound | Drew Neumann | Music |
| Art | Don Watson | Background Designer |
| Directing | Robert Alvarez | Director |
| Directing | Russell Calabrese | Director |
| Directing | Shaun Cashman | Director |
| Production | Shaun Cashman | Producer |
| Writing | Shaun Cashman | Storyboard |
| Directing | Phil Cummings | Director |
| Directing | Matt Engstrom | Director |
| Directing | Eddy Houchins | Director |
| Directing | Gordon Kent | Director |
| Directing | Christine Kolosov | Director |
| Directing | Michel Lyman | Director |
| Directing | Sue Perrotto | Director |
| Directing | Kris Sherwood | Director |
| Crew | Nina G. Bargiel | Series Writer |
| Crew | Jeremy Bargiel | Series Writer |
| Visual Effects | Joo-Shik Yoo | Animation Director |
| Visual Effects | Soo-hyun Park | Animation Director |
| Visual Effects | Kwang-bae Park | Animation Director |
| Visual Effects | Hyung-tae Kim | Animation Director |
| Visual Effects | Lee Jae Bok | Animation Director |
| Production | Louis J. Cuck | Producer |
| Production | Jennifer Pelphrey | Producer |
| Production | Brian A. Miller | Executive Producer |
| Sound | Gregory Hinde | Music |
| Editing | Illya Owens | Editor |
| Production | Kris Zimmerman | Casting |
| Sound | Kris Zimmerman | Sound Director |
| Art | Marc Perry | Art Direction |
| Writing | Marc Perry | Characters |
| Production | Jay Bastian | Executive In Charge Of Production |
| Production | James Silverman | Production Manager |
| Crew | Tony Tedford | Post Production Supervisor |
| Writing | Alex Almaguer | Storyboard |
| Crew | Mark Bachand | Prop Maker |
| Writing | Jay Baker | Storyboard |
| Crew | Anna Chambers | Prop Maker |
| Writing | Mike Diederich | Storyboard |
| Writing | C.H. Greenblatt | Storyboard |
| Writing | Chris Headrick | Storyboard |
| Writing | John Holmquist | Storyboard |
| Writing | Spencer Laudiero | Storyboard |
| Writing | Ian Wasseluk | Storyboard |
| Writing | Tara Whitaker | Storyboard |
| Writing | Chris Mitchell | Storyboard |
| Sound | Jesse Aruda | Sound Editor |
| Sound | Brad Brock | Sound Re-Recording Mixer |
| Sound | Timothy J. Garrity | Sound Re-Recording Mixer |
| Editing | Jim Hearn | Dialogue Editor |
| Sound | Glenn Oyabe | Sound Editor |
| Sound | Eric Sequeira | Sound Re-Recording Mixer |
| Sound | Robert Serda | Sound Engineer |
| Visual Effects | Azariah Owens | Visual Effects |
| Visual Effects | Sandy Benenati | Animation |
| Art | Joe Binggeli | Background Designer |
| Writing | Joe Binggeli | Characters |
| Art | Bill Flores | Background Designer |
| Writing | Frank Homiski | Characters |
| Writing | Phil Rynda | Characters |
| Visual Effects | Phil Rynda | Color Designer |
| Art | Cliff Voorhees | Background Designer |
| Writing | Eva Wu | Characters |
| Editing | Rob Desales | Editor |
| Crew | Alicia Parkinson | Post Production Supervisor |
| Crew | Antonio Gonella | Supervising Technical Director |
| Directing | Juli Murphy | Director |
| Production | Ben Pile | Producer |
| Production | Pietro Piumetti | Producer |
| Production | Shalonda Ware | Production Accountant |
| Production | Maxwell Atoms | Executive Producer |
| Writing | Maxwell Atoms | Characters |
| Writing | Maxwell Atoms | Storyboard |
| Crew | Maxwell Atoms | Series Writer |