After a wild stag party in Las Vegas for their friend Doug (Justin Bartha), Alan, Phil and Stu (Zach Galifianakis, Bradley Cooper and Ed Helms) head for Thailand for Stu's wedding. Unfortunately these male members of the wedding party are still as prone to degenerate party antics as they were during their male bonding episode (as seen in The Hangover).

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The Hangover 2