One morning on the way to school, Otto takes the bus on a short detour to propose to his girlfriend Becky through the drive-in window of the restaurant where she works. Bart persuades Marge to have the wedding in their backyard, and everything goes well until Otto insists on playing the heavy metal music Becky hates so much. The marriage is over as soon as it starts and Becky winds up living with the Simpsons as she tries to put her life back together. Soon, it becomes clear that Becky is becoming competition for Marge in the home, baking, teaching the kids karate, and helping them with homework. It's only a matter of time before Marge snaps and tries to take back her life--by force.