In the last gasp of Scooby Doo the show was called "The 13 Ghosts of Scooby Doo." In it Scooby, Shaggy, Scrappy Doo (who ever created him should be tarred and feathered for this annoying dog), a side kick Flim-Flam, and Daphne have to capture 13 Ghosts that were locked in a Chest of Demons. Scooby and Shaggy had let the ghosts out. They were added by Vincent Von Ghoul (done by Vincent Price who was the best part of the show).
Daphne finally gout out of her usual mini dress, not that there was anything wrong with it. The Purple jump suit was a nice touch.