Don is a Bollywood action film released in 1978. The movie was produced by Nariman Irani and directed by Chandra Barot. The music was by Kalyanji Anandji and lyrics by Anjaan. The film stars Amitabh Bachchan, Zeenat Aman, Pran, Iftekhar , Helen and Om Shivpuri, Satyan Kapoo and Pinchoo Kapoor. Over the years, the movie has gained the status of a cult film in India.

Synopsis: Don (Amitabh Bachchan) is the leader of an underworld gang until Police Officer D'Silva (Iftekhar) tracks him down and in an attempt to catch him ends up killing him.But Don's death is only known to D'Silva.So Officer D'Silva tracks down a lookalike of Don named Vijay. Vijay impersonates Don to take down the rest of Don's gang while the DSP promises him that he will give a proper education to his wards who are actually the children of Jasjit (Pran).

In the meantime Jasjit comes out of prison after serving his term, only to find Officer D'Silva having a red diary that would show Vijay's true identity. Officer D'Silva is killed by Malik who is introduced as the interpol officer, but in actual fact the real king of the underworld. It's now a race to retrieve a the DSP's diary in which the DSP has documented his substitution of the real Don with the innocent Vijay...

Don begins, true to its title, as the story of one of the most powerful men in the business of crime, who in spite of being one of the most wanted on the list of the Interpol, remains elusive to the police. Don (Amitabh Bachchan) is not a typical Hindi film negative character; he is understated and yet dominating, a man of few words who is stylish yet not flashy, he represents a negative character who you just can not hate, as his sophisticated and sharp intelligence makes you actually envy him. Along with the police, he makes a few other enemies through his merciless approach to running his organization especially when he kills one of his own men, Ramesh, when Ramesh decides to leave the business. This introduces Don to two new enemies, Kamini (Helen) Ramesh’s finace and Roma (Zeenat Aman) Ramesh’s sister. While Kamini seduces Don and attempts to have the police arrest him, her plan backfires as Don outsmarts her and the police in his escape, and in the process Kamini loses her life. A shattered yet revenge seeking Roma enters Don’s gang after proving that she too is on the wrong side of the law and will not hesitate in taking the life of even a cop. She appeals to Don and he allows her to work for him, without realizing her true intentions. Meanwhile after a couple of unsuccessful attempts at nabbing Don, the police finally succeed, but unfortunately Don dies during the pursuit, endangering ACP D’Silva’s (Iftekhar) plan to reach the source of all crime, the man Don reported to, through capturing Don alive. D’Silva buries Don’s body so that it remains unfound, ensuring that people believe that he may still be alive, and as luck would have it, D’Silva remembers his chance encounter with Vijay, a simpleton trying to survive in the hustle and bustle of Bombay in order to support two small foster children, who bears a striking resemblance to Don. D’Silva hatches a plan to transform the Banarasi paan loving Vijay into Don, and place him back into the crime nexus, but this time as a police informer.

Don returns to his gang, albeit while suffering a bout of amnesia at around the same time that JJ (Pran), just released from jail, begins his mission of revenge against D’Silva and his search for his children Deepu and Muni, who had been saved and taken care of by Vijay. While Roma is hell bent on eliminating Don in order to avenge her brother’s death, she is suddenly introduced to the fact that Don is dead and the man she is trying to kill is actually Vijay. Meanwhile as Vijay learns more and more about Don, his life and his contacts through his discovery of Don’s diary and Roma’s help, he announces to his colleagues that his memory is back and he remembers that he is Don and meanwhile hands the diary over to D’Souza. Celebrations ensue, as Don announces his return to the world, but things take a drastic turn when the police raid the celebrations, and Vijay’s only witness to his true identity, D’Silva, dies in the crossfire and now Vijay is tangled in a web of confusion where the police refuse to believe that he is Vijay not Don, whereas his underworld gang realizes that he is indeed Vijay and not Don, and hence Vijay is now not only hated by the police, but also by Don’s righthand man Narang and the rest of his gang. To add to Vijay’s woes, Don’s diary which he had handed over to D’Souza and is his last hope of proving his innocence, is stolen by JJ in an attempt by him to track down his lost children, without realizing that Vijay is the one man who can reunite him with them. Vijay escapes the clutches of the police and the underworld with Roma’s help and transforms back into his old self but with a sword hanging over his head as he struggles to prove his identity and innocence. The climax reveals a shocking twist in the tale where Vijay discovers who is truly on his side, and who is against him.