Hanna-Barbera series featuring Scooby Doo, a dog who joins Velma, Daphne, Freddie, and Shaggy on many quests to solve mysterious. Each mystery is new and unusual and involves the group stopping someone from wreaking certain havoc on the world. Scooby-Doo was a large, lovable but cowardly Great Dane who hung around four California high school students (Fred, Velma, Daphne and Shaggy). The four teenagers were in constant search of mysteries and adventures, driving around in a bright green van known as the Mystery Machine. Many of the group's adventures involved villains who took on supernatural disguises (ghosts and monsters); the villains' activities usually involved blackmail, theft, fraud and other forms of corruption. At the first hint of trouble, Scooby-Doo (and usually, Shaggy as well) running for cover; they usually found themselves in even deeper trouble. It usually took the promise of a Scooby snack to get Scooby (and Shaggy) to come out of hiding. The mysteries were always solved by the end of each show.