When Kim is tardy when going to class, she is sentenced to detention. Meanwhile, Drakken and Shego start their next evil plan.

Chester Yapsby has stolen a top-secret project that is capable of making insects grow to incredible heights. Kim is contacted for the assignment because she never fails to get a job done, though when it turns out that the giant cockroaches bother Kim as she has a personal fear of insects. Ron must help her overcome her fear in order to save the day. Meanwhile, Ron names one of the cockroaches Roachie and decides to keep it as a pet, much to Kim’s chagrin.