"The 13 Ghosts of Scooby Doo" was about the adventures of Scooby Doo, Shaggy Rogers, Daphne Blake, and Scrappy-Doo chasing after more mysteries. Now they are joined by a magnificent warlock called Vincent Van Ghoul, who is a cartoon caricature of Vincent Price, and a mischievous boy named Flim-Flam.