Scooby-Doo and the gang team up with their pals, Bill Nye The Science Guy and Elvira Mistress of the Dark, to solve this mystery of gigantic proportions and save Crystal Cove!
You can now watch Happy Halloween, Scooby-Doo! online on the following streaming providers in the United States.
| Writing | Maxwell Atoms | Screenplay |
| Directing | Maxwell Atoms | Director |
| Production | Maxwell Atoms | Producer |
| Production | Sam Register | Executive Producer |
