Professor Uttam Chaudhary is a retired Hindi teacher who lives with his daughter and young son in the city of Mumbai. He is suffering from what is laughingly called 'old age' - brief periods of forgetfulness, blanks in memory. Little does anyone realize that the problems are much deeper, and that this is just the beginning of a journey that will end in a man becoming a prisoner of his mind.
As his memories start to fade, a childhood trauma surfaces - a memory of being accused of murdering Gandhi. The more his life is whitewashed, the stronger this one memory remains. As his world turns increasingly hostile, Prof. Chaudhary sees everything as an enemy - his house is a jail, his family, all are his captors. And in the midst of all this is the story of his daughter. A single woman, working to not only support the family monetarily, but is also the only lifeline that can save her father from drowning in the universe his mind is creating.
It is the story of the power of one person's strength, hope and determination in pulling their loved one away from the abyss. It is a film that connects two disparate events together. One, of a small middle class family in present day Mumbai struggling to come to terms with the fact that the head of the family is now suffering from early dementia and two, the assassination of the father of the nation, Mohandas Karamchand Gandhi.
The Professor's often repeated and exasperated denial 'Maine Gandhi Ko Nahin Mara' is rooted back in an era when a truth seeking son of India became the father of a newborn nation. Someone killed this man, but his truth survives. He lives as long as his ideals breathe within us.
So though the title of the film says 'Maine Gandhi Ko Nahin Mara', it also sends out a message saying that Gandhi ji is still alive in me! He should be alive in every one of us!
The film explores the downward spiral of a retired Hindi professor, Uttam Chaudhary, (portrayed by Anupam Kher) as he falls victim todementia. After he sees someone carelessly place a ash tray on a newspaper photograph of Mahatma Gandhi, his senility increases. One night his daughter Trisha, played by Urmila Matondkar, and son Karan discover his room on fire. Trisha takes him to a doctor who says nothing can be done.Then Uttam believes he killed Mahatma Gandhi by accidentally playing with a toy gun which had real bullets and shooting Gandhi during his walk in Birla House. So they go see Uttam's brother for details. Uttam's brother says that when they were young, they played darts by filling ballons with red dye and placing it on someone's picture.One day someone found Gandhi's picture and Uttam popped a ballon while their father saw who believed he killed Gandhi, with Uttam replying "Maine Gandhi Ko Nahin Mara" while his father hit him. Later they go to another doctor named Siddharth Parvin Dabas who helps Uttam when he thinks that his house is jail and people poisoned his food because he killed Gandhi. Siddharth eats the food so Uttam knows the food is not poisoned. Later they are in court and a gun expert says that a toy gun (which Uttam believes he killed Gandhi with) can not kill anyone.