The story takes place some time after the events of the second film. Stu Price (Ed Helms) is getting married to Lauren (Heather Graham), and the group of friends plan a wild bachelor party in Bangkok, Thailand. However, things quickly go awry when they discover that they have lost a friend, Doug Billings (Zach Galifianakis), who has been kidnapped by a notorious crime lord, Marshal (John Goodman).