Don (1978) , a 1978 crime film/bollywood movie released on 4/20/1978 starring Amitabh Bachchan, Zeenat Aman, Pran, Helen, Iftekhar, produced by Nariman A. Irani. Simpleton Vijay is recruited by D'Silva, a cop, to replace Don, a wanted criminal, and trace the details of his illegal activities. But, things take a turn for the worse when D'Silva is killed..