Years after their high school days, Jim and Michelle are rushing to tie the knot. With Jim’s grandmother seriously ill and eager to see her grandson marry before it’s too late, the couple decides to speed up their wedding plans. Meanwhile, Stifler is determined to throw the wildest bachelor party imaginable in celebration of Jim’s last days of freedom. As the big day approaches, Jim’s dad is as dependable as ever, offering unsolicited advice — much of which Jim would rather not hear. The countdown to the wedding promises plenty of chaos, awkward moments, and unforgettable memories as old friends reunite for one last big hurrah.