From the director of Old School comes a comedy about a bachelor party gone horribly wrong. Two days before his wedding Doug (Justin Bartha) & his three friends (Bradley Cooper Ed Helms & 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 & the groom is nowhere to be found. With no clue of what happened & 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 & 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.