Lisa is inspired to learn dancing, so she begins taking classes. All the while, Bart and Milhouse pretend they are at camp, when they are actually staying overnight in the Springfield Mall. Police Chief Wiggum is conviced that giant rats have made their home in the mall, so he tries to exterminate them.
During a drought, Hank installs low-flow toilets in his house. But he soon finds that they require so many flushes that they actually waste more water than the old toilets. Hank joins the Arlen zoning board in an attempt to get high-flow toilets legalized again.
Mulder and Scully cross paths with two women who are identical and have followed each other across 17 states in the last three years, causing chaos and mayhem wherever they are.
When the Planet Express crew lands on a previously undiscovered plant, they find that it is covered in a new and delicious animal life form which they call 'popplers'. These edible and highly addictive 'popplers' soon become a new business venture for the crew as Earthlings just can't seem to get enough of these delicacies. The dreaded Omnicrons reveal just what these 'popplers' actually are, and seek restitution for Earth's 'poppler' consumption.
