Scooby-Doo en de bende werken samen met hun vrienden, Bill Nye The Science Guy en Elvira Mistress of the Dark, om dit mysterie van gigantische afmetingen op te lossen en Crystal Cove te redden!
Nee, helaas is Happy Halloween, Scooby-Doo! nog niet beschikbaar op Netflix in Nederland.
| Production | Kris Zimmerman | Casting |
| Production | Colin A.B.V. Lewis | Line Producer |
| Sound | Kelly Ann Foley | Dialogue Editor |
| Production | Frances E. Chang | Administration |
| Art | Demetrice Wilson | Prop Designer |
| Production | Susan Ward | Production Supervisor |
| Sound | Steve Rucker | Original Music Composer |
| Art | Damon Moran | Prop Designer |
| Sound | Patrick J. Foley | ADR Editor |
| Sound | Michael Garcia | ADR Editor |
| Production | Chaz Murphy | Production Accountant |
| Production | Bobbie Page | Production Supervisor |
| Editing | Mike Mangan | Editor |
| Sound | Jeff O. Collins | Other |
| Production | Maral Simonian | Production Accountant |
| Editing | David Cowles | Online Editor |
| Production | Monique Mosbe | Assistant Production Manager |
| Production | Liz Carroll | Administration |
| Production | Greg Emerson | Other |
| Crew | Joe Ruby | Thanks |
| Art | Tim Divar | Storyboard Artist |
| Sound | Mark A. Keatts | Supervising Dialogue Editor |
| Sound | Michael Garcia | Dialogue Editor |
| Editing | Cris Mertens | Other |
| Production | Athena Wingate | Production Accountant |
| Crew | Robert J. Kral | Additional Music |
| Production | Shaun Avnet | Line Producer |
| Sound | David M. Cowan | Dialogue Editor |
| Sound | Kelly Ann Foley | ADR Editor |
| Sound | Patrick J. Foley | Dialogue Editor |
| Production | Jay Bastian | Executive In Charge Of Production |
| Sound | David M. Cowan | ADR Editor |
| Production | Debbie Lindquist | Production Accountant |
| Visual Effects | Daniel Schier | Character Designer |
| Crew | Brittany Canasi | Post-Production Manager |
| Art | Joey Adams | Storyboard Artist |
| Art | Danny Ducker | Storyboard Artist |
| Production | Ed Adams | Production Manager |
| Crew | Ken Spears | Thanks |
| Sound | Mark A. Keatts | Supervising ADR Editor |
| Directing | Maxwell Atoms | Director |
| Writing | Maxwell Atoms | Screenplay |
| Production | Sam Register | Executive Producer |
| Production | Maxwell Atoms | Producer |
| Art | Jess Marfisi | Background Designer |
