Comedy trilogy from director Todd Phillips. In 'The Hangover' (2009) Ed Helms, Bradley Cooper and Zach Galifianakis star as three friends who lose their best friend, Doug (Justin Bartha), just 40 hours before his wedding during the various drunken misadventures that occur at his Las Vegas bachelor party. The trio must attempt to retrace all the bad decisions they made the night before and figure out where things went wrong. Heather Graham co-stars.