When Billy Broccoli finds out his personal ghost, Hoover Porterhouse, is failing Responsibility, Billy decides it's his mission to help Hoover turn his grade around. But how?

Then inspiration hits. Billy is going to get Hoover a pet. There's only one catch -- the Hoove scares dogs out of their fur, birds out of their wings, and fish out of their gills. If Billy can't find the perfect pet, how will Hoover ever learn make the grade?