Brahmastra: Ranbir Kapoor and Alia Bhatt to do a double shift to complete the shoot

Apart from Alia Bhatt, Ranbir Kapoor and Amitabh Bachchan, Ayan Mukerji's Brahmastra also stars Mouni Roy, Nagarjuna Akkineni, Shah Rukh Khan, Dimple Kapadia to name a few.