When Billy Broccoli finds out he's got to demonstrate a special skill for a class contest, he thinks he's got it made. With his ghostly best friend, Hoover Porterhouse, by his side, Billy's got the competition in the bag. But when Billy lands a spot on the sixth-grade team, he starts spending more time with his new teammates than he does with Hoover. And the Hoove plays second fiddle to no one.

When Billy Broccoli finds out that his ghostly best friend, Hoover Porterhouse, is failing Responsibility, he decides to give him a pet. The problem is that pets are scared of Hoover.