Douglas "Doug" Billings is best friends with Phil and Stu, and the brother-in-law of Alan, with whom he also shares a friendship. He is the most mild-mannered of the Wolfpack. His bachelor party trip to Las Vegas is the basis of The Hangover, although he is "lost" for the majority of the movie as the other three guys are searching for him. Stu finally puts the pieces together and figures out that they locked Doug up on the roof of Caesar's Palace, where he gets severely sunburned with no shade in the desert heat. They end up getting him back "better late than never" to his wedding, where he is forced to get married with a beet-red sunburned face. While standing before the minister, Doug tells his soon to be wife Tracy "I promise for as long as we're married, to never, ever put you through