Scooby inherits part of a fortune. The catch is he and the four other inheritors must remain in Col. Sanders's "creepy old mansion" for one night. If one does not last the night, then his inheritance will divided among the other inheritors. Throughout the night, the gang discovers that the house may indeed be haunted. Scooby finds a phantom in the basement and the other four inheritors disappear.
The cartoon is full of interesting bits. The gang discover an old organ and work to crack its code. Scooby and Shaggy use wine corks to fend off pursuing phantoms. The trap the gang sets for the phantoms is classic Hanna Barbera cartoon fun. My favorite: a cranky goldfish growls at Shaggy for stealing fish food for his sandwich. As a musician, I would like to point out that the animators correctly had Thelma play the notes F-E-E-D on the organ, and also the correct pitches were sounded. So, bravo for the attention to detail.
This episode holds many of the elements that gave the early Scooby Doo cartoons all of their charm: a mystery, creepy surprises, comedy, a great soundtrack, among others.