A sorority moves in next door to the home of Mac and Kelly Radner who have a young child. The Radner's enlist their former nemeses from the fraternity to help battle the raucous sisters.

Jason Kelly is one week away from marrying his boss's uber-controlling daughter, putting him on the fast track for a partnership at the law firm.

Through a series of misunderstandings, Alvin, Simon and Theodore come to believe that Dave is going to propose to his new girlfriend in New York City - and dump them.

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