Dean Wormer gives the Delta House one week to clean up the house or face expulsion because of a new college bi-law of displaying clean frat houses. So, Hoover and the guys hire a house mother to help get things together. Meanwhile, Blotto enters a weightlifting contest to try to win the money that is required to make repairs to the house.

The Deltas somehow manage to trick the Omegas into town and away from campus. The Deltas switch the Greek letters on their house and the Omega's house. So the Deltas' Moms and Dads are visiting them in the clean Omega house,while the Omegas' Moms and Dads end up in the messy Delta house. The Deltas switch the letters back before the Omegas return. Naturally, the Omegas never find out that this has happenned.

Pinto gets severe acne on his face which makes him self-conscious about his looks, so his frat brothers try to help him regain his confidence. Meanwhile, Dean Wormer tries angling for grant money for the science program from a visiting military officer and his best chance at getting it is Hoover's new science project.