This film is a gem. It has to certainly be an all time classic for people of my generation who grew up in the 70's and 80's. To those who live in England, it is of special significance as it was shown on Channel 4 a few times in the mid and late eighties.
I cannot begin to describe the story as it is quite complex. It basically involves a lottery ticket and how it changes three friends. The story continues into a heroes versus villains struggle and ends, as usual, with good winning. However, just listen to the cast list. Amitabh Bachchan, Rishi Kapoor and Shatrughan Sinha are our main three heroes. Kimi Katkar, Reena Roy and Hema Malini are our heroines. "Good guys" include Pran and Amjad Khan. Villains include Kader Khan, Shakti Kapoor, Prem Chopra, and of course Amrish Puri in a commanding performance as "Don." As if the film were short of film stars, there is an EXCELLENT film sequence for the song "John Jani Janardan" (a classic for the age). It involves various actors and actresses in guest appearances, including Raj Kapoor, Shammi Kapoor, Rajesh Khanna, Dharmendra, Simi and many many others.
Other songs in the film are also extremely memorable. In particular, the final picturization "Rang Jamake Jayenge" is an instant classic.
What can I tell you about this film if you have not already seen it? It is a classic. Apart from all the above, Amitabh is on TOP form. This film is unprecedented in the number of top stars that have appeared in it. Although the story is not novel, it works. Songs are fantastic. If you haven't seen it yet, make it a priority. If you have, it's time to watch it again...