Party-animal Rick Gassko (Tom Hanks), who makes his living as a Catholic school bus driver, decides to finally settle down and marry his girlfriend Debbie Thompson (Tawny Kitaen). After gathering his buddies to give them the news, his shocked friends (led by Jay (Adrian Zmed)) decide to throw him the bachelor party to end all bachelor parties. The bride's wealthy, conservative parents are not at all happy with her decision and her father decides to enlist the help of Debbie's ex-boyfriend Cole Whittier (Robert Prescott (actor)) to break them up and win her back.