The Hangover (film series) 2010, in Ontario, California, before moving on location in Thailand. Two years after "The Hangover Part II", Phil, Stu, and Doug are happily living uneventful lives at home. The only member of the Wolfpack who is not content is Alan. Still lacking a sense of purpose, Alan has ditched his meds and given in to his natural impulses until the untimely death of his father forces him to finally re-evaluate his lifestyle and seek the help he needs. Phil, Stu, and Doug are there to make sure Alan takes the first step. This time, Alan gets married to Cassandra, and
The Hangover (film series) opts for a safe, subdued pre-wedding brunch. However, things do not go as planned, resulting in another bad hangover with no memories of the previous night. Once again someone is lost, this time Stu's future brother-in-law, and Phil, Stu, and Alan search for him in Bangkok. Warner Bros. hired Todd Phillips and Scot Armstrong to write a sequel to "The Hangover" after a trailer brought down the house at ShoWest in April 2009, two months before the film was released. The principal actors were cast in March 2010 to reprise their roles from the first film. Production began in October