In the film, Norville "Shaggy" Rogers inherits a country estate and a Southern plantation from a recently deceased uncle.

Meanwhile, Shaggy also has to deal with a trigger-happy enemy of his uncle, who wants to shoot him, and a girl who wishes to marry him, both to settle the feud between their families.

Initially Shaggy wants to leave, but before they can do that, his truck apparently sinks into quicksand, forcing him, Scooby and Scrappy to spend the night there.

Intrigued by that very first clue, the gang decides to hunt down the rest of the jewels much to Farquard's chagrin and that of Sheriff Buzby, who drops by to provide a warning about the gorilla that escaped from the wrecked circus train and was seen headed towards the Beauregard estate.

Shaggy, Scooby and Scrappy follow the trail through a number of clues that the Colonel has hidden for them, which takes them to several different points in the mansion and also in the rest of the plantation.

To make matters worse, they also have to deal with Billy Bob and his sister Sadie Mae, both of whom continue to pursue Shaggy, and who keep showing up along with the escaped gorilla.

On top of that, the trio encounter a very angry bear, and the Boo Brothers reveal themselves incapable of getting rid of any ghost, only causing more mayhem whenever they try to help.

[1] The film was released on Blu-ray as part of a Hanna-Barbera Superstars 10 boxset through Warner Archive Collection on February 20, 2024.