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.

Houndsley and Catina run into trouble when they decide to prove that they are the best at cooking and writing, respectively.

Chester the cat is more than ever convinced that Bunnicula is a vampire when there is a harvest of white vegetables on the morning after the night that Bunnicula was probably wandering through the neighborhood.

The Monroes leave their cat and two dogs alone on Halloween night, unaware that their pets are about to be visited by a strange figure who might be a wicked witch.

Houndsley likes canoeing and his friend Catina likes bicycling, but each has to help the other learn to enjoy these activities in order to do them together.

Continuing his search for fame as a writer, Howie the wire-haired dachshund creates a story remarkably similar to the popular one he has heard about a heroic boy wizard.

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