The gang goes out boating, but gets lost in a fog and crashes their boat on the mysterious Haunted Isle. They decide to venture to the abandoned Vázquez Castle on the island for help, but instead encounter a transparent phantom running loose, who threatens them to leave the island and never return.

Thanks to Shaggy reading the map upside down, the sleuths end up in Gold City, an old mining town in the California desert, which is being haunted by the ghost of a miner from 1849 who is said to wander the mines looking for the last vein of gold.

The gang’s beach party is interrupted by a ghost in a glowing deep sea-diving suit, who they think is connected with the disappearance of several yachts. The mystery leads the gang underwater, to a bay known as “The Graveyard of Ships” where they run into the ghostly diver again.

Scooby-Doo is named in the will of Colonel Beauregard Sanders, an eccentric millionaire whose life he saved several years earlier. The only way to claim the inheritance is for Scooby, and the other four heirs to spend the night in the Colonel’s mansion — which they quickly learn is haunted by two phantom shadows, later […]