Once a young man named Tamil learns that a businessman is planning to build a factory in his village, he tries to stop the plan for fear of pollution.
Murugan is a happy-go-lucky youngster and aspiring actor in Chennai who mostly roams around with his sidekick, Soori (Soori). One day, Murugan meets Kamalini , who is the daughter of the wealthy industrialist, Sanjay, owner of Sanjay Industries. The relationship between the two starts off sour, but later become romantic. Sanjay initially plans to finish off Murugan, when he found out Murugan's relationship with Kamalini. But to his shock, he finds that Murugan looks exactly like one of his old enemies, Sangathamizhan.
Many years earlier, Sangathamizhan and his family including his lover and cousin, Thenmozhi stopped the launch of Sanjay's copper factory in their village due to the toxic effects on the villagers caused by the waste from the factory. In retaliation, Sanjay killed Sangathamizhan and his family with the help of Kulandaivel, who is a fellow politician and the former best friend of Sangathamizhan's father during a festival. Now, Sanjay strikes a deal with Murugan and asks him to act as Sangathamizhan so that he can help him establish the copper factory in the village.
It is eventually revealed that Murugan is actually Sangathamizhan, alive and well. He had survived the explosion that annihilated his family and is hell-bent on avenging their deaths by killing Sanjay. Sangathamizhan comes to Sanjay's base where he fights Sanjay and Kulandaivel, ultimately emerging successful. The film ends with the copper factory sealed shut by the court and in an interview with the press, he says that as long as all the villagers are united, anything is possible to achieve.
