Four Superhits In A Month

In July 1999, Bachchan was named the "Greatest Star of stage or screen of the Millennium" by BBC online poll where he defeated many Hollywood legends such as 

Alec Guinness, 

Marlon Brando, 

Laurence Olivier and 

Charlie Chaplin

https://en.wikipedia.org/wiki/List_of_awards_and_nominations_received_by_Amitabh_Bachchan

Kasme Vaade	1978	Amit / Shankar[a]	Ramesh Behl

Trishul	1978	Vijay Kumar	Yash Chopra

Don	1978	Don / Vijay	Chandra Barot

Muqaddar Ka Sikandar	1978	Sikandar	Prakash Mehra

There is no doubt that megastar of the millennium, Amitabh Bachchan , at 74, is one of the top three names on the wishlist of all filmmakers. And why not... there was a time when the superstar delivered as many as four superhits in one month. Yes, you read that right! While today’s actors celebrate short-term successes, Big B delivered four commercial successes in a row in October 1978. In one of his recent interviews, Bachchan revealed how the audience doesn’t mind watching four films of the same actor in the same month as long as the film delivers good content and entertainment. The films that released back-to-back and went on to become superhits were ‘Muqaddar Ka Sikander,’ ‘Kasme Vaade,’ ‘Don’ and ‘Trishul.’ Interestingly, two of these four films – ‘Kasme Vaade’ and ‘Don’ – saw Amitabh in a double role. Another intriguing fact is that barring ‘Don,’ three other films saw Rakhee as the female lead opposite Bachchan. What’s commendable is that all four films were directed by four different filmmakers, had drastically different stories and saw Bachchan essaying diametrically opposite characters.

https://en.wikipedia.org/wiki/Amitabh_Bachchan_filmography