From the director of Old School comes a comedy about a bachelor party gone horribly wrong. Two days before his wedding, Doug (Justin Bartha) and his three friends (Bradley Cooper, Ed Helms and Zach Galifiankis) drive to Las Vegas for a blow-out night they’ll never forget. But when the three groomsmen wake up the next morning with pounding headaches, they can’t remember a thing. Their hotel suite is beyond trashed and the groom is nowhere to be found. With no clue of what happened and little time to spare, the trio attempt to retrace their bad decisions from the night before in order to figure out where things went wrong and hopefully get Doug back to Los Angeles in time for his wedding. However, the more they begin to uncover, the more they realise just how much trouble they’re really in.