Tom Hanks as Rick Gassko leads his friends in a wild and debauched bachelor party on the eve of his wedding to Debbie Kitaen, but things take a turn when Debbie's ex-boyfriend Cole tries to sabotage their relationship and her wealthy parents disapprove of her choice. The party descends into chaos as Rick and his friends fight back against Cole, and in the end, it takes a dramatic showdown at a movie theater for Rick to prove his love and loyalty to Debbie.