Petty criminal Naai Sekar kidnaps dogs belonging to the rich in order to collect a ransom, but makes a critical mistake when he abducts the dog of a ruthless gangster.

Kaththi Sandai is the story of a farmer who becomes a Robin Hood style thief for the welfare of his village. He steals from the people who deny his village of its basic needs and uses the money for its development.

The film is about a young writer Anbu, who deals with a mental disturbance, due to his circumstances and the worst possible situation he is living in. Being isolated from social activities Anbu leads his life with guilt consciousness. Betrayal, rejections, illusions, anger, unknown voices around, and searching for a reason for self-destruction make Anbu take an important decision.

Vetri and Maya love each other. Vetri’s twin brother Shakthi wants to molest Maya, so he is thrown by his parents. A few years later, villains kill Vetri, his parents, and Maya. They return as ghosts and eliminate them one by one. Shakthi returns as a powerful tantrik and kills all the villains for his family’s dispute. He now uses his power to kill Vetri, and at the same time, wants to have sex with Maya as revenge. In the end, good wins over evil.

The movie is about Ilangovan aka Ilango (Parthiban), a middle-class youth, who dreams to get his sister Kavitha (Mallika married to a millionaire. He is very keen on becoming rich and falls in love with Roopa (Lakshmi Rai), daughter of a rich industrialist. Now and then Ilango comes across Chellappa (Vadivelu), a petty thief, and takes him for a fun ride. A sequence of events makes Ilango realize that money is not everything in life. He finally, along with Chellappa, takes efforts to get his sister married to the boy whom she loves.