Two days before his wedding, Doug (Justin Bartha) drives to Las Vegas with his best buddies Phil and Stu (Bradley Cooper and Ed Helms) and his future brother-in-law Alan (Zach Galifianakis), for a blow-out bachelor party they vow they’ll never forget.

But when the three groomsmen wake up the next morning with pounding headaches, they can’t remember a thing.  Their luxury hotel suite is beyond trashed and the groom is nowhere to be found.

With no clue about 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 in the hopes of finding Doug and getting him back to L.A. in time for his wedding.

But the more they begin to uncover, the more they realize just how much trouble they’re really in.

The Hangover stars Bradley Cooper (Yes Man, He’s Just Not That Into You), Ed Helms (TV’s The Office), Zach Galifianakis (What Happens in Vegas), Heather Graham (Austin Powers: The Spy Who Shagged Me) and Justin Bartha (the National Treasure films).

The film’s forward-in-reverse structure appealed to director Todd Phillips as a storyteller.  “Starting from that morning, these three grromsmen have to put their heads together and pursue one potential lead after another that will take them back through every twist and turn and screw-up of the night before and, hopefully, get them to the place where they last saw Doug.  And the audience gets to take that ride along with them.  You pick up the pieces when they do.  In some ways it’s like a classic detective story,” the director offers.

Opening soon across the Philippines, “The Hangover” is distributed by Warner Bros. Pictures, a Warner Bros. Entertainment Company.