Warner Bros. "The Hangover" is a 2009 comedy feature directed by Todd "Old School" Phillips, starring actors Bradley Cooper, Ed Helms, Zach Galifianakis, Justin Bartha, and Heather Graham, scheduled for a North American release June 5.
Premise follows bride-groom 'Doug Billings' (Justin Bartha), his soon-to-be brother-in-law 'Alan Garner' (Zach Galifianakis), his two best friends 'Phil Wenneck' (Bradley Cooper) and 'Stu Price' (Ed Helms) as they travel to Las Vegas for Doug's bachelor party.
After a wild night of alcohol, gambling and partying, Alan, Stu, and Phil awake the next morning not remembering the events of the prior night.
Unable to find Doug, the groomsmen encounter a variety of problems as they retrace their steps in order to find their friend...