Doug and his groomsmen, in The Hangover, head to Vegas for his bachelor party, but when they wake up the next morning with the worst hangovers they have ever had, they realize Doug is missing and no one can recall the events of the past twelve hours.
Two days before his wedding, Doug (Justin Bartha) and his three friends (Bradley Cooper, Ed Helms and Zach Galifianakis) drive to Las Vegas for a blow-out bachelor party they’ll never forget.