Vijay as Sundar has given full joy to his fanbase and the general audience with his versatile performance. If he is lightning quick with the dance moves, he is an absolute tornado in the fight sequences. Add to that the trademark Thalapathy punches and swag that sends the "Nanbas, Nanbees and Kutty kutties" into ecstasy.
Sundar Ramaswamy is a highly successful non-resident Indian businessman based in the United States of America, referred to as a "corporate monster" due to his ruthless business dealings. He arrives in Chennai to cast his vote in the Tamil Nadu Legislative Assembly election. However, he finds out that someone else had already voted in his name. Sundar approaches the Tamil Nadu State Election Commission and demands a stay on the election result for his constituency, an annulment of the fraud elector's vote and the ability to legitimately cast his vote, to which they agree. Sundar raises awareness among the public regarding fraud voting and finds that many people too faced a similar problem to his when trying to vote.
Meanwhile, Sundar rekindles his romance with his estranged sister-in-law's sister Nila, whom he had last met five years ago. His actions bring him into conflict with two influential and corrupt politicians, M. Masilamani, who is the Chief Minister of Tamil Nadu, and his brother Malarvannan "Rendu". Although Masilamani's party wins the elections, the Election Commission annuls the result based on Sundar's plea and fresh elections are scheduled to take place within the next fifteen days. After attempts are made on his life by Rendu's henchmen, Sundar decides to contest the election against Masilamani as an Independent and resigns from his company to avoid any conflict-of-interest.
Initially unpopular among the masses due to his corporate background, Sundar delivers a speech detailing his rise from a humble fisherman background to a businessman, and gains popular support. He and his supporters gatecrash an event involving the merger of Masilamani's party with the opposition. After Sundar confronts Masilamani regarding his silence on district-related issues, the police brutally beat up Sundar and his supporters. At this juncture, he realises that the entire political system in the state and country needs reform, and decides to contest in all constituencies in Tamil Nadu along with his supporters. Sundar acquires video evidence wherein people who had attempted to expose Masilamani's corruption were killed under mysterious circumstances, and plans to reveal it to the media to discredit Masilamani and have him arrested.
Meanwhile, Masilamani's daughter Komalavalli "Pappa", based in Canada, arrives in Chennai after finding out that her father and uncle have lost support due to Sundar. She decides to spoil Sundar's reputation and frame him as a corrupt and power-hungry person. She orchestrates a car accident and frames Sundar for it, which causes him to lose considerable public support. She furthers her agenda by killing her father with an overdose of diabetic tablets, so that her party will gain sympathy votes. These crimes ensure that Pappa, the new Chief Ministerial candidate for her party, would likely win the election. Sundar decides against exposing the evidence against Masilamani as he feels that his support will further erode, which was what Pappa intended to accomplish.
On Election Day, Twitter messages generated from one "Muthukumar" allege Sundar has stashed black money in various locations, which further degrades Sundar's reputation. However, unknown to anyone, the tweets were sent by Sundar himself, as Muthukumar was one of those activists killed by Masilamani. Further messages lead to Muthukumar's decomposed body being found, exposing Pappa's lies. Meanwhile, Pappa finds out that her mother has decided to expose Pappa's role in Masilamani's death at the latter's memorial in front of the media later in the day. She arrives at the memorial with her henchmen to stop the expose, but Sundar subdues Pappa's henchmen and her mother's confession is live-streamed, which ensures that the public support is back with Sundar.
Sundar and his supporters win the election, while Pappa and Rendu are arrested for their various crimes. However, Sundar decides against becoming the Chief Minister, and instead chooses one of his supporters, a honest collector, to be the next Chief Minister.

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