Ravi is a youngster from Thoothukudi who aspires to become a police officer like his role model, Encounter Specialist DCP Devaraj IPS. After completing his PUC, he joins a college in Chennai and also earns a living by driving an auto rickshaw. During the course, he meets Suseela, an IT professional and falls in love with her.

Although Suseela rejects Ravi's advances at first, with the help of her grandmother, Ravi succeeds in winning Suseela's heart. Meanwhile, Chella is a gangster and womaniser, meets Ravi's friend Uma in a public place, where she is taking donations for some cause, and immediately develops an attraction to her. When Uma asks Chella to contribute money, he willingly donates by inserting a rupee note in her jacket. Uma feels shamed and tells to her father what happened.

Ravi finds out what had happened to Uma through her father, he comes to her defense and beats up Chella, hospitalising him. His troubles start from there as Chella's father, a powerful don named Vedanayagam, with the help of his right-hand man, a corrupt police officer Kattabomman, begin to create havoc in Ravi's life. Ravi is soon thrown into jail on a false case of drug smuggling and is expelled from college.

Suseela is willing to help him where she goes to Devaraj and pleads with him to help Ravi, but Devaraj initially refuses to help as his entire family had died at the hands of Vedanayagam and he himself was blinded by him because he had taken action against him and his gang. However, with the help of his people known in the police department, He saves Ravi from being killed in a fake encounter led by Kattabomman. It is at this stage that Ravi takes up a new persona called Police Ravi to clean up the illegal activities of Vedanayagam and instill hope in the public, something that Devaraj was unable to do.

In the process however, Vedanayagam kills Ravi's close friend Sugu, prompting Ravi to kill Chella in retribution. Vedanayagam decides to become a minister, in order to prevent Ravi from targeting him and his activities. As Ravi finally plans to kill the newly sworn-in minister Vedanayagam, The police arrive to arrest him. However, Ravi sees Devaraj in the crowd and announces Vedanayagam's location to him just as he is being arrested, allowing Devaraj to assassinate Vedanayagam, effectively avenging his family's death. Devaraj is reinstated into the police force and offers to make Ravi a police officer. However, Ravi refuses, stating that he has found the police officer within himself and that is all he needs to succeed in life.