A man (Amitabh Bachchan) is found wounded on railway tracks and when he awakens he has no memory of who he is and doesn't remember anything about his life. Six years later he is living with a wealthy couple and is now named Naresh Dutt. One day he begins to regain his memory when he watches a film and realizes that the actress in the film is related to him somehow. It is then that he discovers the actress in the film is none other than his wife Rekha Roy (Rekha). He finds out that she is now a very successful film actress changing her name to Sunita Devi and her manager is none other than Ranjeet Malik (Prem Chopra) who used to be his best friend. In flashbacks he remembers that his real name is Amit Roy and Ranjit was the one who attempted to kill him six years earlier by throwing him off the train he was traveling on with Rekha. Amit also discovers that his young son who is now 10 years old has been sent to a boarding school and sets out a plan to regain custody of his son. First however he plans on taking revenge against Ranjit. Amit comes up with a plan to re-enter Rekha and Ranjit's lives by disguising himself as a film producer. He meets with Rekha and Ranjit and offers Rekha the opportunity to act in his new film titled Do Anjaane. Rekha and Ranjit grow suspicious of Naresh Dutt as they start to realize that he bears a striking resemblance to Rekha's supposedly deceased husband Amit Roy and the storyline of his film eerily mirrors Rekha's past life. Will she discover the true identity of Naresh Dutt? and what revenge has Amit/Naresh got planned for Ranjit?