Leslie Chow, also known as Mr. Chow, is the main antagonist of The Hangover. He became a supporting protagonist in Part II, but again became an antagonist in Part III - considered to be the secondary antagonist behind Marshall, but reforms yet again after reconciling with the protagonists. He is one of the series' five main characters, the others being Phil Wenneck, Stu Price, Alan Garner, and Doug Billings. He is also the most infamous characters besides Alan.