Molly becomes smitten with her pretty and popular chemistry partner's clique; Mary and Jerry's anniversary celebration goes awry.Molly's new lab partner in science class is Nick's current girlfriend, with whom Molly soon bonds after Nick dumps the popular girl. Meanwhile, Jerry arranges to take Mary to a swing-club outing to celebrate their anniversary, not realizing that it's not a dance group but rather a spouse-swapping coterie.
