Justin Paul Theroux is an American actor and filmmaker. He gained recognition for his work with director David Lynch in the mystery film Mulholland Drive (2001) and the horror film Inland Empire (2006). He also appeared in films such as Romy and Michele's High School Reunion (1997), American Psycho (2000), Charlie's Angels: Full Throttle (2003), Strangers with Candy (2005), Miami Vice (2006), Wanderlust (2012), The Girl on the Train (2016), The Spy Who Dumped Me (2018), On the Basis of Sex (2018) the voice of Dropkick in Bumblebee (2018), and Lady and the Tramp (2019).

The Girl on the Train is a 2016 American mystery psychological thriller film directed by Tate Taylor and written by Erin Cressida Wilson, based on the popular 2015 debut novel of the same name by British author Paula Hawkins. The film stars Emily Blunt, Rebecca Ferguson, Haley Bennett, Justin Theroux, Luke Evans, Allison Janney, Édgar Ramírez, and Lisa Kudrow. The film follows an alcoholic divorcée who becomes involved in a missing person investigation.