With high school a distant memory, Jim and Michelle are getting married — and in a hurry, since Jim's grandmother is sick and wants to see him walk down the aisle — prompting Stifler to throw the ultimate bachelor party. And Jim's dad is reliable as ever, doling out advice no one wants to hear. It's the wedding of Jim and Michelle and the gathering of their families and friends, including Jim's old friends from high school and Michelle's little sister.