Phil (Bradley Cooper), Stu (Ed Helms), Alan (Zach Galifianakis) and Doug (Justin Bartha), set out to exotic Thailand to marry Stu. After an unforgettable bachelor party in Las Vegas, Mr. Young did not want to risk and decides to organize a late breakfast just before his wedding. But the plans do not go his way and lost his fiancee's younger brother Stu. This is what happened in Las Vegas have already been recorded in the pages of history, but what happens in Bangkok, it is impossible to even imagine.