An aspiring police officer decides to serve the country in spite of being rejected for the job. He gets into an argument with Rahul, the wayward son of an honest cop.

An easy-going taxi driver, Shiva (Karan) gives out advice on hygiene and the need to be ‘professional’ to an idli vendor on street, thus establishing himself as someone with a humanitarian side, in the very first scene. Further, his conversation with Gnanasambandam (who plays himself) in a car and the way he talks to his over-concerned mother over phone (Kovai Sarala’s voice) brings him closer to the audience. However, within no time, things go haywire when the story actually kicks off.
Nila (Neha) is being chased by a prominent drug dealer (Naren) in the town, and Shiva comes to her rescue and offers a lift. He tries to contact people who are close to her to ensure safety. Little does he know that he is inviting trouble, as things start going beyond his control. What follows is an unexpected series of incidents.

The movie begins with an orphan Ganesh (Srikanth) coming in search of a job at a petrol bunk in ECR. He manages to win the goodwill of the petrol bunk owner and gets a job there. Enters Priya (Bhavana), an arrogant college student. He throws a challenge to his friends to make Priya fall for him. Meanwhile, Priya’s brother Vetri (Suresh), a leading criminal lawyer in the city, comes to know of Ganesh’s moves and tries to thwart his plans.

Kannan and Dass are two famous rowdies in their village. Dass has a sister called Uma with whom Manikkampillai (shortened as ‘Mapillai’) is in love but she is not interested in him. Mapillai joins Kannan’s and Dass’ firm KD & Company as the manager, in an attempt to win the love of their sister. KD & Company once keeps as hostage a music troupe who comes to their village to perform. The main singer of that troupe, Sangeetha gets expelled from her home because of this and so Kannan and Dass gives her refuge upon insistence from Uma. Meenakshi is the childhood friend of Kannan with whose father, both Kannan and Dass has enmity.

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.

Rana, a noble warrior, seeks revenge against his father’s killer, Rishikodagan. Meanwhile, he also upsets and attracts the ire of the enemy kingdom’s ruler, Raja Mahendran.

A village ruffian, who settles disputes in his native, takes on a big shot when he tries to sort out the rough patch in his marriage after several years.

A contract killer escapes after murdering a politician and must help the cops find a murderer after a slain officer’s memories are transferred to his brain.

Hell breaks loose for the families of a village where mysterious incidents take place after an unfortunate death on a very auspicious day. Later, a determined villager decides to uncover the truth.

The story revolves around a Tamil pop singer Inderjeet based in Bangalore who has a large female following. The movie opens with the death of a back-up dancer, Sandhya, in Inderjeet’s group. Soon a police detective is put in charge of the investigation. Although the police suspect Inderjeet as he is very short-tempered, they have no evidence linking him to the crime. Meanwhile, Divya, Sandhya’s sister, arrives at her aunt Dr. Prabhavathy’s house to find out the truth about Sandhya’s death. She goes to meet Inderjeet but is put off by his arrogance. She talks to his manager, Dr. Harichandra Prasad, and other musicians who all have differing opinions about Sandhya.

Rishi sends to Hyderabad and join in a college as a Hindi lecturer as a part of an undercover operation. He fall in love with her student Vinamra. Rishi has to extract information about Kittu from Vaishali, another student.

Shankar is an orphan raised by a sincere police officer named Raja Rao. His son Bharath accidentally kills a kid and Shankar takes the blame on him. Shankar is imprisoned and Raja Rao warns him not to meet him again. After graduating, Shankar is employed as a circle inspector of police. He is popularly referred to as ‘Encounter’ Shankar because of his track record as an encounter specialist.
He is transferred to Bukkapatnam town in Tadipatri, Ananthapur district. He is assigned the task of halting the illegal businesses of Damodar, an influential crime boss whose dream project is to build a power plant. Using his wits, Shankar destroys all the three main businesses of Damodar by trapping their respective in-charges. He brings a stay on the power project by bringing few vital witnesses before the court of law, thereby earning Damodar’s ire. On a parallel note, Shankar loves a sweet shop owner named Saroja who reciprocates her feelings at a later point of time.