Two days before his wedding, Doug and his three buddies drive to Las Vegas for an unforgettable stag-night. However when they wake up the next morning in a wrecked hotel room and with pounding headaches, the groom is nowhere to be found. With no clue of what happened and little time to spare, the trio must 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.