The movie begins as an old English woman Amy Wilkinson (Carole Trungmar) almost at her death bed in London, wants to come down to Chennai in search of a young man Parithi (Arya) whom she last saw on 15 August, 1947 to return Thali necklace (sacred thread tied around the neck of the bride by her groom) of his mother, which he gives as a sign of stating that she belongs to India and nobody can separate them. She wants to return that back to him, as she gets married to other man in her home town and it no more belongs to her.

Dr. Vasi invents a super-powered robot, Chitti, in his own image. The scientific body, AIRD, that must approve the robot, declines it based on its not having emotions and the ability to make rational judgment. A sudden flash of lightning evokes emotions in the robot, and Chitti is seemingly ready for integration into the human world. Then, Chitti falls in love with Dr. Vasi’s fiancée Sana and turns on his creator.