With East Great Falls High now just a memory, the kids have grown into young adults ready to wreak havoc with a new rite of passage - Jim (Jason Biggs) and Michelle (Alyson Hannigan) are getting married - in a hurry. Jim's grandmother is sick and wants to see Jim walk down the aisle, so they're going for it in two frantic weeks.

Stifler plans to be there (bridesmaids!), and more importantly to throw the ultimate bachelor party (strippers!). Finch (Eddie Kaye Thomas) is all for the hedonistic rituals, but not for letting Stifler steal the maid of honor, who happens to be Michelle's sexy younger sister, Cadence (January Jones). While everybody else sweats and frets, Jim's Dad (Eugene Levy) is cool as ever, dispensing advice that no one wants to hear and getting ready for one of the best days of his life.