S1, E20: Nick has become an eco-warrior, patterning himself after his latest hero, Roger Persimmons, agent of the EPA. In an effort to regain his son's admiration (and also solve the world's environmental woes), Wayne invents the world's first Refuse Ingesting Protozoa, RIP. Meanwhile, Persimmons has targeted Jentech as number two on his Environmental Enemy list. Jennings must find a way to dump three tons of toxic by-products before the EPA conducts a full inspection of the facilities the next day.