Based on Aami Shey O Sakha, the bestselling novel in Bengali by Dr Ashutosh Mukherjee, Bemisal is an improvement upon the original Bengali version, which starred Uttam Kumar. Of course, Bemisal is helped in no mean measure by better techniques, color, excellent music, and one of the finest performances ever in Hindi film history. Yes, this has to be one of Amitabh Bachchan's best roles. He plays a child specialist, Dr Sudhir Roy, a very complex character: you never know whether or when he is joking and when he is serious. With a criminal past (he was part of a gang that hired children to steal), his mind is overwhelmed by feelings of gratitude toward his benefactor, the kind-hearted judge (Om Shiv Puri) who recognises him as the son of his son's tutor and brings him up. The judge's son Prashant, played ably by the dependable Vinod Mehra, grows up to be a gynecologist. In time, they meet Kavita (Rakhee), and both seem to develop a liking for her. However, Sudhir feels he owes it to Prashant because of what Prashant's father did for him, and hides his feelings, and happily arranges to get Prashant marry Kavita. Very soon, Prashant changes into one money-making machine, performing abortions for money, and very soon has the police after him. It is at this point that Sudhir pays back with his career: a wonderful example of sacrifice and love.
In subplots, the viewer is taken into Sudhir's dark past and also to his look-alike teacher brother's tragic existence, which ended up in an asylum, after he was tortured by his student Ruby Dutt and her father. The role of the brother, Adhir Roy, is also played by Amitabh, and boy, does he do a great job!