Jagannathan, fondly known as Jaggubhai, is an upright, straightforward, and tough Indian police officer with sharp methods. His way of dealing with the criminals strikes terror in the underground world. Jaggubhai is sent to Australia on an important mission to deal with antisocial elements there. In Australia, he meets Ilavarasi, and they fall in love with each other. Jaggubhai fails in his mission for which he came to Australia, and the brief romance with Ilavarasi also ends abruptly. Jaggubhai returns to India as a dejected officer, failing in both his official duty and personal life. However, fate had something in store for him. 20 years later, or as he says it 21 years later, he gets a call from Australia stating that Ilavarasi is dead and has left him a will. He reaches Australia and is shocked to know that the brief encounter with Ilavarasi had resulted in a daughter named Monisha, who is now a teenager. Jaggubhai realizes that he has left behind his daughter and her wish that he should protect her. Monisha thinks he is her mother's friend and tries to act cranky. The threat comes in the form of some antisocial elements who want to eliminate Monisha. These thugs were the same ones who had tricked Jaggubhai 21 years earlier and who had killed Ilavarasi. Now, it is Jaggubhai's duty to save his only daughter and settle old scores with the thugs. He now meets his former colleague Kaaliyappan or MIB. With his help, he kills the thugs and their leader Hamid Ansari (Richard Raj). Monisha then accepts Jaggubhai as her father.