The film opens with the ageing gangster, Singaperumal, forcing himself on a young girl, Subbu. He is unable to perform, and vents his anger by slapping the helpless Subbu. Singaperumal is the grand don of crime in Madras. His lieutenant, Pasupathi, brings a proposal. A large stash of cocaine, worth about ₹ 2 crore, has entered the city. The guy bringing the stash wants to sell it for ₹ 50 lakh. Pasupathi sees the immediate easy profit, as well as the long term benefit (to control the cocaine market with such a large supply) and the recognition that they are able to pull off such a deal. The drawback is that the stash really belongs to their arch-rival Gajendran. Singaperumal knows that Gajendran is a vicious and unpredictable adversary, and the venture is risky and likely to become messy. He decides to pass. Pasupathi dourly suggests Singaperumal is getting old and rusty. He asks Singaperumal to loan him the ₹ 50 lakh so he can do the job himself. Pasupathi is prepared to face the risks, and in return for the loan, he offers Singaperumal a cut of the profits. Singaperumal agrees to the loan, but, instead asks Pasupathi to first get the stash and then think of the profit distribution. The money for the loan is brought to Singaperumal.

A woman who loses her husband in a police encounter plots to take revenge on the gangsters who had framed him.

Sridhar (Tarun) is a final year degree student and gets selected in the campus selections for studies abroad. He goes to Mumbai for an interview and in his return finds Preeti (Trisha) and loses his heart to her. Sridhar comes to know that Preeti was about to join in degree and Preeti learns that he was a final year degree student. Sridhar is an ardent cricket fan, so is Preeti, while Sridhar is also a good football player. The principal of the college appoints a coach called Reshma (Shriya), who is also a student, for the football team led by Sridhar. Sridhar tries his best to trace Preeti by visiting several women’s colleges, while Preeti also watches for Sridhar at the men’s college. Accidentally, Preeti helps Sridhar’s mother, when she had a heart attack. In order to find Preeti at any cost, Sridhar goes to the LB Stadium, where a cricket match is in progress and gets injuries in a bomb blast in the stadium. Just before the blast, both Preeti and Sridhar find each other but could not meet due to the blast.

Later, Arivu joins a leading FMCG company Saffron and joins its sales department under Stella Bruce (Thambi Ramaiah). He also manages to bring his friend Bhagya (Vijay Vasanth) out of Kasi’s gang and gets him a job in Saffron. He meets Aadhi (Fahadh Faasil), Saffron’s brand manager, who teaches him how to progress. On the night of April 1, Kasi and his gang stab Bhagya. Arivu tries to attack Kasi, but Kasi’s rival Doss (Sharath Lohitashwa) stabs Kasi, and Arivu admonishes Kasi for being a paid henchman. Kasi reveals to Arivu that he killed Bhagya on a contract given by Jayaram (Anish Kuruvilla), the President of Saffron, due to the fact that Bhagya tries to help Kasthuri (Sneha), who files a case claiming Saffron’s products to be adulterated, due to which she had lost her son. Arivu is addressed by Kasi as being a worse hitman than he himself is. Arivu then saves Kasi. Kasi tells Arivu that all the products manufactured by this company are adulterated. Arivu takes up a mission to fight such malpractices not only in Saffron, but also in all the other five major food companies, including the company owned by Madhav Kurup (Mahesh Manjrekar). Arivu shares all of his plans with Aadhi. It is revealed that Aadhi is Adhiban Madhav, Madhav’s son. He joined Saffron to know their trade secrets and merge the company with his father’s company.

A mathematician genius, Mathi, has another identity, Cobra, who commits intelligent crimes using math.

The bodyguard Michael Bryce continues his friendship with assassin Darius Kincaid as they try to save Darius’ wife Sonia.

Kaakki Sattai has Murali (Kamal Haasan), a young man who trains very hard to become a police officer. Uma (Ambika) is his neighbour and they fall in love with each other while Uma supports Murali to achieve his goal but he is rejected after the physical test due to not having influence or money.
Angered by the rejection, Murali turns into a local rowdy. He causes trouble in his district and comes to the attention of a notorious smuggler and murderer, Vicky (Sathyaraj) and his partner Anand (Rajeev). After initial conflict between the two, Vicky recruits rowdy Murali into his gang. Murali becomes his most trusted member. He grows intimate with a girl, Anita (Madhavi), who is looking for personal revenge against Anand.

Raja who is born blind but has extraordinary senses and is a trained skillful fighter is assigned to rescue a girl.

Tamil, a young IT professional, is raised single-handedly by his grandfather but later moves to the city. His relationship with his grandfather deteriorates after the latter causes him embarrassment.

Karnan, a fearless village youth, must fight for the rights of the conservative people of his village, due to the torture given by a police officer.

A high school student with amnesia tries to uncover what has happened to her. All leading her into deeper troubles ultimately revealing a darkness she could not have imagined.

A young and dynamic boy has the urge to mint money meets a girl, who believes Money is the cause of all distress to life. How does their life transform together?