In Manhattan, when a client is bitten by a rat in the dressing room of the Garsons Department Store and contracts Weil's disease, the manager Susan Costello is assigned to hire and give all the necessary support to the best exterminator in New York, Jack Carver. The efficient Jack and his assistant Ty find a colony of mutant rats and try to convince the health department administrator and former partner of Jack, Ray Jarrett, how serious the infestation is. But the politician Ray is interested in covering the problem to protect economical interests of powerful groups.

The next door neighbors Nell Bedworth and Woody Deane have opposite behaviors and hate each other: the virgin geek Nell is polite, sensitive and well-prepared to go to Yale, while Woody is rude and his greatest expectation is to join a mediocre university due to his abilities playing football. When Nell and Woody are assigned to visit a museum together, they argue in front of a statue of an Aztec god. During the night, their souls swap bodies, bringing difficult situations to them. They first try to damage each others reputation in high school, but soon they discover that their dream of joining college can only happen with mutual respect and support.