When a young accountant is devastated after discovering his inspiringly beautiful girlfriend is cheating on him, his best friend, who's engaged to a girl he doesn't love, convinces him to go on a "run" and sleep with as many women as he can to get over his heart break.
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.