The film revolves around a bachelor party that a group of men throw for their friend Rick Gassko (Hanks) on the eve of his wedding and whether he can remain faithful to his fiancée Debbie (Kitaen).

Party animal Rick Gassko, who makes his living as a Catholic-school bus driver, decides to settle down and marry his girlfriend, Debbie Thompson.

After learning the news of the engagement, Rick's shocked friends, led by Jay, decide to throw him an epic bachelor party.

The bride's wealthy, conservative parents are unhappy with her decision, and her father enlists the help of Debbie's ex-boyfriend Cole to sabotage her relationship with Rick and win her back.

While Debbie worries and goes off to a bridal shower thrown by her friends, Rick heads to the bachelor party, which takes place in a lavish, spacious hotel suite, and promises to remain faithful.