Harold the dog and Chester the cat try to figure out why Howie the puppy dreads the arrival of Santa Claus.

Howie the dog is afraid of Santa Claus and believes ghosts are haunting Christmas.

Why is Howie the puppy so scared that "a big fat man in a red suit is going to come down the chimney? Why are Harold the dog & Chester the cat hearing noises in the basement in the middle of the night? Is Bunnicula's house being invaded by Christmas ghosts?

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

When Toby Monroe has a birthday party, his pets' curiosity is aroused by seven strange suitcases which they investigate, with surprising consequences.

The Monroe family tests Harold the dog's willpower when they leave him alone with a pan of fudge.

When Chester learns that the Amazing Karlovsky will use a rabbit in his school magic show, he comes up with a plan to stop vampire bunnies.