Wealthy Bishan (Amjad Khan) and servant Kishan (Amitabh Bachchan) are friends who grew up together in their small Indian village. Bishan goes off to the city to explore the wider world, but returns after several years to renew their friendship. Discovering that Kishan has a great singing voice, Bishan whisks him away to Bombay to help him become a star. But just as Kishan is gaining fame, Bishan loses his fortune and his sanity due to his unscrupulous uncle and cousin (Jeevan and Ranjeet) and only Kishan can help him.
Solid entertainer with a strong ability to tug at your heartstrings, which is mainly due to the performances of Amitabh and Amjad Khan. They are very convincing as friends, their chemistry is superb- it's good to see Amjad Khan in a positive role, and he's simply superb as the gentle-hearted Bishan, who loses his mind. Amitabh matches him in the acting stakes, and the rest of the cast - Neetu Singh, Sulochana, Tanuja, Ranjeet, Jeevan, and Kadar Khan - do brilliantly.
The first half of the film is comedic, especially with the Polydor staff trying to turn Amitabh's village bumpkin into a star; of course, he eventually becomes one, and ends up singing some memorable songs. The second half gets serious, with Amjad Khan put in the mental institution after the kids in his care get kidnapped by Jeevan and Ranjeet. There's some action at the end, but it's mostly well-scripted story about friendship.