It was just announced yesterday that Happy Halloween Scooby-Doo! will be released on DVD on Tuesday, September 15th exclusively at Walmart and, as they originally said, released everywhere else and digitally on Tuesday, October 6th.
According to the press release, found below, Crystal Cove is terrorized by flying jack-o-lanterns that were created due to the pumpkin patch being infected with toxic ooze. The gang has to solve the mystery with the help of Bill Nye the Science Guy and Elvira, who will guest star in this new animated movie.
ORIGINAL TRAILER: https://www.youtube.com/watch?v=lxy0FN6nvNM&feature=youtu.be