The Great Gambler

Jai (Amitabh Bachchan) is an expert gambler and has never lost a game. These skills bring him to the attention of the underworld don Saxena (Utpal Dutt), Jai agrees to work under him and do so,unknowingly to entrap a patriotic Indian named Nath who works for the government. After losing large amounts of money, he is blackmailed into revealing the blueprints of a top-secret military laser weapon The only problem is that Inspector Vijay is Jai's look-alike, and is not at all a good gambler.