Once Upon A Time In Mumbaai is a forthcoming Bollywood film, directed by Milan Luthria and starring Ajay Devgan, Emraan Hashmi, Prachi Desai, and Kangana Ranaut. The film is produced by Balaji Telefilms and Popcorn Entertainment. Once Upon A Time In Mumbaai is scheduled for release on 30 July 2010
The film will wrap the whole growth of the Mumbai underworld, from crime and smuggling in its near the beginning stages through its link with international terrorism in recent times. It is based on actual activities. It is believed to be loosely based on the lives of Haji Mastan and Dawood Ibrahim.