| Director | Samuthirakani |
|---|---|
| Genre | drama film |
| Country | India |
Narayanan is the son of State Minister Pandiyanar in Vellore. Narayanan has been using his father's name and influence to make money through corruption, much to the latter's dismay. Although Pandiyanar has been an MLA and minister for only three years, Narayanan has amassed a huge fortune and an industrial empire by unsavoury means. One day, some goons try to kill a man in daylight, as instructed by Narayanan. The man is lying in a pool of blood, and a local person witnesses this and calls an ambulance. The ambulance driver is Maha Vishnu, a kindhearted man who takes pride in never letting anyone die in his ambulance on the way to the hospital. Vishnu admits the man to the hospital, and he is saved. Narayanan is angry with Vishnu for saving his enemy, to which the latter replies that saving people's lives is his duty.
Vishnu is married to Bagalamugi. He has a father and sister, Mahishasuramardini. The latter is stalked by Vicky, a drunkard and jobless youth who happens to be a friend of Vishnu. Vishnu convinces Vicky to reform and attend the medical technician course. Vicky completes it and saves people's lives, earning the love of Vishnu and his family. Mahi has a friend named Gowri, who is stalked by Narayanan's brother Chinna Pandi, and she beats him on a bus. Insulted by this, Chinna Pandi beats Gowri up with a wooden log. Enraged, Mahi and the students kill him. Vishnu arrives with his ambulance to admit Chinna Pandi to the hospital. To avoid traffic, he takes the outer bypass, infuriating Narayanan. Chinna Pandi succumbs to the injury. Narayanan blames Vishnu for this and beats him up, but the public saves him. Narayanan vows to kill Vishnu.
Vishnu gets mad after his father loses his hearing ability and his wife suffers a miscarriage. Deeply saddened by this, he confronts Narayanan, who pleads his innocence. Vishnu believes that, being a common man, he cannot do anything against a powerful man with political support. Narayanan has consistently bribed local police Inspector Uthaman and various government officials and has them under his control. Sub-Inspector Rahman helps Vishnu. Vishnu plans to destroy Narayanan and bring him to justice. He is covertly invited to join the ruling party by the District secretary, who, despite being an MLA, had not been made a minister because Pandiyanar's caste has more votes in their district. Vishnu declines and proceeds by himself. He gathers all the details of the properties owned by Narayanan and video footage of him insulting Uthaman and the government officials while bribing Narayanan's auditor, who helps Vishnu because he once saved his wife's life. Vishnu realizes that Narayanan used Pandiyanar's name to earn huge amounts of money and buy many properties through corruption. Vishnu sends the evidence to IT, Vigilance, and other departments. He also sends the video footage to Uthaman's wife and the government officials' wives, who lose respect of their families. Uthaman and the government officials decide to stop supporting Narayanan for his further actions.
The IT department raids Narayanan's house, confiscates all of his belongings, and arrests him. Pandiyanar is sacked from the state cabinet and woes in despair. Narayanan is goaded to escape from the hospital, through the info that the state government is planning his suicide to repair damage, and the police chases him. He temporarily evades them but meets with an accident in the town center. While he is struggling, Vishnu comes with his ambulance and saves him.