The Hangover is a 2009 American
comedy film, co-produced and directed by
Todd Phillips and written by
Jon Lucas and
Scott Moore. The film stars
Bradley Cooper,
Ed Helms,
Zach Galifianakis,
Heather Graham,
Justin Bartha, and
Jeffrey Tambor. It tells the story of Phil Wenneck (Cooper), Stu Price (Helms), and Alan Garner (Galifianakis), who travel to
Las Vegas for a
bachelor party to celebrate their friend Doug Billings' (Bartha) impending marriage. However, Phil, Stu, and Alan have no memory of the previous night's events and must find Doug before the wedding can take place.