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

Three stories about Bunnicula the vampire bunny, Harold the dog and Chester the cat. In the first, Chester tries to warn his human family that their foundling baby bunny must be a vampire. In the second, Harold and Chester are boarded at a strange pet boarding house called Chateau Bow-Wow. In the third, Bunnicula vanishes from his cage and zombie vegetables start to appear in the neighborhood gardens.

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.

Howie the wirehaired dachshund tries his paw at writing a new kind of novel, a mystery in which he imagines himself as a private investigator and Delilah as the "mysterious dame."

Though scoffed at by Harold the dog, Chester the cat tries to warn his human family that their foundling baby bunny must be a vampire.