Double bill of comedies from director todd phillips in 39the hangover39 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 in the sequel 39the hangover part 23