Panier
Subramaniyam Siva (Ajith Kumar) is in jail, awaiting the death sentence for killing corrupt and evil members of the police force who had killed his father SI Ganapathy (Rajesh) and sister. SP of Police 'Nethiadi' Nandakumar (Prakash Raj) is an honest, fearless, and upright police officer who has been given the mission to flush out the terrorist outfit behind the Coimbatore blasts. He decides to employ unconventional methods to fulfill his mission and engages Siva to assist him, renaming him Paramasivan, changing his look (cutting his Jaṭā hair), and giving him a single-point agenda – trace out and erase the people responsible for the Coimbatore blasts. Unaware to Paramasivan, Nandakumar intends on killing him after the mission is completed.
The fly in the ointment is played by CBI officer Nair (Jayaram), who is out to trace Paramasivan and stop his unlawful activities. His assistant SI Agniputran (Vivek), provides lighter moments. How Paramasivan finishes the villains and his job forms the rest of the story. Paramasivan comes to know of Nandakumar's idea to kill him after the mission during the last few scenes where Nair intervenes. Eventually, Paramasivan is forgiven and starts a new life with his lover Malar (Laila).