Ruby is mortified when the classroom becomes infested with creepy crawlies that everyone has brought in for a group study project. When she goes crazy trying to kill every critter, Earl is furious! Not only were bugs the first creatures on earth, but Earl's first pet was an insect! Earl morphs the school into a giant field, complete with sophisticated ant tunnels and insects 10 times the size of the students. Fortunately, the kids recall that insects are attracted to smells, and they maneuver through the school via the ant tunnels in search of Buford's cologne. Once they find the wretched cologne, they spray a trail of scent -- all the way to Earl's boiler room! Naturally, the insects follow the trail and descend upon Earl's room, destroying yet another of his evil plans. Once the dust has settled, Ruby's adventure makes her realize that every creature, even the smallest insect, has value

It's Career Day, and a variety of career exhibits have set up shop throughout the school. Marcus feels sorry for Buford. No one seems interested in his janitorial exhibit. Marcus guilts the gang into visiting by reminding them how helpful Buford has been in their past adventures. Pleased by their visit, Buford enthusiastically tells the kids about his general duties. He gets into plumbing, explaining such things as clogs, traps, sewer gas, etc. But the kids show no interest. Buford picks up on this and slinks off, his feelings hurt. Marcus is angry with his friends. Made to feel guilty, Ruby argues with him. She really likes Buford, but she doesn't think that he should be pushing sanitation engineering as a career. Making a living in a sewer? ""Come on, what kind of a crazy person would want to work underground for a living?""

Earl is outraged! He works underground for a living, and he's certainly not crazy! He transforms the school into a sewer, complete with noxious sewer gas, bursts