The Hangover (2009) | Official Trailer

The Hangover is a 2009 American comedy film directed by Todd Phillips. The film stars Bradley Cooper, Ed Helms, Zach Galifianakis, Heather Graham, Justin Bartha, Ken Jeong, and Jeffrey Tambor.

It tells the story of Phil Wenneck (Cooper), Stu Price (Helms), Alan Garner (Galifianakis), and Doug Billings (Bartha), who travel to Las Vegas for a bachelor party to celebrate Doug's impending marriage. However, Phil, Stu, and Alan wake up with Doug missing and no memory of the previous night's events, and must find the groom before the wedding can take place.