Marudhu (Mahadevan) and Kaliammal (Saranya Ponvannan) are a rich but childless couple. They adopt Kannan (Prabha), a young man from a lower caste. However, Kannan feels depressed to leave his parents and little sister for his new family. Kannan, Marudhu and Kaliammal then leave their place for Kaliammal's native village.

Chellakili and Murugan are long-lost-lovers who unite when Murugan visits her village disguised as a musician, Murugesh. Chellakili's aunt devises a sinister plot to separate them.

Vijay is an ex-cop who was framed up after he cleaned the city of the scum of the earth including nine encounter killings of dreaded gangsters. Now out of work, he is persuaded by his former boss to be the bodyguard of 8-year-old Priya whose parents are millionaires. He is hired to protect the little girl from kidnappers who are on the prowl. The kidnappers are led by a loony militant called 'Ahmed Khan' who manages to kidnap Priya and humiliate Vijay. The rest of the film is how Vijay assisted by two glam girls mete out vigilante justice in a cat-and-mouse game with the kidnappers.

The film begins with Kadhirvel (Prashanth), a do-gooder going all out to get water for his village. With monsoon repeatedly failing, his village reels under drought and Prashanth runs from pillar to post to get a well dug in the village. He manages to bring Shanmugham (Mahadevan), a water-divining expert to dig a well in the village. Shanmugham along with his wife and daughter Marikozhundhu (Pooja) come to the village. Unfortunately a freak mishap kills Shanmugham and the villagers' search for water continues.

Azhagesan is a mentally ill man who is in love with his cousin Nandini who is in love with her college professor