While their human family is away, Harold the dog and Chester the cat are boarded at Chateau Bow-Wow where Chester becomes increasingly alarmed by the strange behavior of his fellow guests and the sudden disappearance of one of them.

At head of title: Bunnicula's pals : Harold, Howie, and Chester. The Monroe family tests Harold the dog's willpower when they leave him alone with a pan of fudge.

When Bunnicula the rabbit starts acting strangely, the Monroe dogs and cat renew their suspicions that he is a vampire.

Harold, Chester, and Howie have a harrowing Halloween night worrying about Bunnicula as well as about a witch who comes into the house.

When Chester and Harold learn that the Amazing Karlovsky is coming to their town, they become suspicious that he may be using his performance as a way to pull Bunnicula, and others like him, out of his hat in order to take over the town.