Once Upon a Time in Mumbaai is a 2010 Indian Hindi-language gangster film written by Rajat Arora and directed by Milan Luthria. It stars Ajay Devgan, 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 box office success. The film is loosely based on the lives of Mumbai underworld gangsters Haji Mastan and Dawood Ibrahim. A sequel, Once Upon a Time in Mumbai Dobaara!, was released in 2013.