Villain movie revolves around One of the twins is bus conductor and the other is handicapped (Ajith in double role). The elder one, Shiva, overhears his parents' plot to kill his mildly retarded brother, Vishnu. He runs away to another city with his adorable brother and strives hard to look after Vishnu. As a result of an incident when 'dada' Sundara Moorthy, who runs a beggar trade beats Vishnu brutally, Vishnu becomes a handicap for life. Shiva leaves Vishnu in a home run by a social worker (Sujatha).
During the day, Shiva works as a conductor and in the night poses as the handicapped Vishnu to play Robinhood and steal from the rich and corrupt. A gang including Thangam (Meena), Ramesh Kanna and others assists him in the operations. He is never suspected and so with the stolen money, he takes care of not only Vishnu but also 800 other institutions for physically handicapped.
A college student Lavanya (Kiran) falls in love with Shiva but Shiva later comes to know that she is the sister-in-law of the 'dada' who handicapped Vishnu. Matters worsen when Sundara Moorthy becomes the chairman for the institute for physically handicapped. How Shiva deals with the situation forms the rest of the story.