Once Upon a Time in Mumbaai is a 2010 Indian Hindi-language neo-noir crime thriller film written by Rajat Arora and directed by Milan Luthria. It stars Ajay Devgn, Emraan Hashmi, Kangana Ranaut, Prachi Desai and Randeep Hooda. Produced by Ekta Kapoor under the Balaji Motion Pictures banner, Once Upon A Time in Mumbaai was released on 30 July 2010 to generally positive reviews from critics, and was a commercial success. The film is loosely based on the lives of Mumbai underworld gangsters Haji Mastan and Dawood Ibrahim. A sequel, Once Upon ay Time in Mumbai Dobaara!, was released in 2013.