The Hangover Part II is a 2011 American comedy film and sequel to the 2009 film The Hangover, and the second installment in The Hangover trilogy. The film was directed by Todd Phillips, who co-wrote the script with Craig Mazin and Scot Armstrong, and stars Bradley Cooper, Ed Helms, Zach Galifianakis, Ken Jeong, Jeffrey Tambor, Justin Bartha, and Paul Giamatti. It tells the story of Phil, Stu, Alan, and Doug, as they travel to Thailand. After the bachelor party in Las Vegas, Stu takes no chances and opts for a safe, subdued pre-wedding brunch.