He mocks the leader and compels him to a fight before escaping in a boat, with the leader as hostage. When he learns about the leader's plan of infiltrating the Indian Army with sleeper agents with the help of a traitor in the Indian Defense - Kameeruddin IAS, the current Joint Secretary in Defence, Jagadish decides to abandon his suicidal plan. Jagadish meets the leader in a ship, which has been rigged with a bomb planted by another of Jagadish's friends. Jagadish decides to sacrifice his life and devises a plan with his fellow army men. He kills one of Jagadish's friends and asks Jagadish to surrender to him or else there would be more terrorist attacks.

With this attack too having failed, the terrorist leader decides to target Jagadish himself. Asif Ali, the second-in-command of the sleeper agents is captured and killed by Jagdish. Using his pet dog and his sister's dupatta, he manages to reach the terrorists' hideout, rescuing his sister, who was about to be killed after Jagadish's bluff was exposed, and the other victims and eliminating the terrorists assembled there. When Jagadish realises the plan, he substitutes one of the people to be kidnapped, with his younger sister Sanjana. When the leader of the terrorist group learns about the role of Jagdish in thwarting the terrorist attack, he begins to target the families of the army men, except Jagadish, by kidnapping someone close to them. Enlisting the help of his fellow army men and Balaji, Jagadish manages to thwart these attacks and kill the sleeper agent leader's brother and eleven other terrorists, including the previously captured sleeper agent. He also discovers that the Islamic terrorist group Harkat-ul-Jihad al-Islami, which the bomber belongs to, has planned various such attacks in the city in a couple of days. Jagadish soon learns that the bomber is a mere executor, a sleeper agent, whose only role was to plant the bomb. Jagadish captures the bomber again, and also forces the police officer who helped the bomber's escape, to commit suicide. He manages to capture the man who laid the bomb, but he escapes from the hospital where he was kept under custody. One day, Jagadish witnesses the explosion of a bus in which he and his police officer-friend Balaji had travelled. Nisha reciprocates after refusing him initially. Jagadish notices her in a boxing match and falls in love with her instantly. On the contrary, Nisha is a university-level boxer, who is completely modern in her outlook. At the bride-viewing ceremony, Jagadish makes up excuses to avoid marrying her, which includes commenting about her being old-fashioned. On his arrival, his parents and younger sisters force him to see Nisha, who they choose for him to be married to. Jagadish Dhanapal, an intelligence officer in the Indian Army, returns to Mumbai from Kashmir. Murugadoss remade the film in Hindi as Holiday: A Soldier Is Never Off Duty in 2014, while Baba Yadav remade it in Bengali as Game: He Plays To Win in that same year.

Thuppakki went on to win six Vijay Awards from sixteen nominations, and was nominated for seven South Filmfare Awards, including Best Film (Tamil), Best Director (Tamil) and Best Actor (Tamil) for Vijay. It was also released in Telugu under the same title. Upon release, the film received positive reviews and became a major commercial success, grossing over в‚№1 billion (US$14 million) in 11 days of its release. It was released on 13 November 2012, coinciding with the festival of Diwali. Thuppakki commenced production in January 2012 and was filmed mostly in Mumbai, except for some song sequences.

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