Ramachandran (Sachin Khedekar) is a genetics scientist who does not get due credit and funds for his research. He tries creating a human with several talents through baby designing, which leads to the birth of his sons, who are conjoined together above the waist. Since they share a common heart, doctors suggest a sacrificial surgery, to which their mother Sudha (Tara) objects. They begin raising their children, Vimalan and Akhilan (both played by Suriya). In the following years, Ramachandran makes it big with Sudha’s help. His company, Locus Lacto Products, makes huge profit through their product ‘Energion’, the top-selling children’s powdered milk energy drink in the market.
Bhoominathan (Vijay) idolises Muthuramalingam (Rajkiran), a rich powerful landlord, and at the request of his parents, he accepts to work for Muthuramalingam as his bodyguard. There enters Muthuramalingam’s rival, who has lost his daughter since she committed suicide, the reason being rejection by Muthuramalingam’s son. While Bhoomi protects Muthuramalingam, his rival threatens the life of his daughter Meera (Asin)
Bhoomi is sent to college along with Meera and her friend Madhu (Mithra Kurian) to protect them from the threat. Bhoomi joins the same class where Meera studies, as he has previously discontinued his education. Meera does not like Bhoomi following her as a bodyguard, and therefore plans to divert him. Meera calls Bhoomi over his mobile phone from a private number and introduces herself as “Ammukutty”. Initially, Bhoomi hates the mobile call as it will disturb him but later on develops a liking towards Ammukutty and slowly love blossoms for Bhoomi without knowing that it is Meera herself.
Village boy make an affair with girl and they continue it even if they grownup. Accidentally boy happened to caught in jail. But after small time he escaped from the jail and come to the girl. The prison officials follow him and catch him. Girl also comes with them.
Commando Karanveer Singh Dogra, is skilled in many aspects of survival, weaponry, and hand-to-hand combat. He is on a mission to eradicate black money, which has been siphoned to banks along with his gang.He goes to Vicky Chaddha’s house where during night time, his wife Maria reveals that they didn’t have a life like this in the past. The film flashes to a flashback where his husband was forced to do all this because when he declined to do a negative job, the very next day, a bomb blast occurred where Vicky was saved but their daughter Tara died. Very soon, Maria kills her husband and says that she is the real Vicky Chaddha. Karan and his gang follow Vicky Chaddha and finally find her transferring money to an account. Karan beats up all the army in her team but doesn’t stop the money transfer. It is then revealed that he changed the account in which the money was scheduled to the transferred and the replaced account which will help the poor people. He said this was planned on the very first day. When Vicky says that police cannot arrest her, Bhavna Reddy shoots Vicky and they get out of there. While Karan and Bhavna will be together, a phone call arrives where Karan says he is waiting for a new mystery to arrive.
The film opens with Sakthi (Vishal), son of a forest ranger, beating up a gang that illegally cuts precious trees to earn money. Sakthi is a jungle trekker who spends his time bringing groups of tourists on trips into the jungle.
Almost immediately the story changes track and introduces Sakthi’s girlfriend Rupa (Sunaina). The lovers soon part ways citing compatibility issues where Rupa complains that Shakthi is not the loving boyfriend she wanted. Sakthi’s character is as such that he does not remember even a single detail in their love life that Rupa deems important. Rupa tells Sakthi that he does not seem to have the time for a girlfriend and that he does not even care to do so. Rupa further aggravates the situation by asking Sakthi to close his eyes and tell her the colour of the dress she was wearing right then, but Sakthi finds that he could not. Grieved, Rupa leaves Sakthi, saying this was his character and that he would not change.
College goer Karunakaran (Arulnidhi) finds it difficult to adjust with the society that he lives. As a result, he is unable to control his anger and ends up with trouble. His unpredictable behavior becomes a constant worry for his mother (Sujatha Sivakumar) and brother. A series of incidents force him to leave his hometown Madurai and end up in Chennai. Despite scoring high marks in school, he joins a local arts college in the city and stays in a hostel, where trouble begins. Meanwhile, while traveling from Bangalore to Chennai, Assistant Commissioner Marimuthu (John Vijay), Inspector Rajendran (Madhusudhan Rao), Sub-Inspector Selvam (Balakrishnan), and Sgt/Head Constable Perumalsamy (Krishnamurthy) witness a car accident. When they are about to take the victim (son of a Bangalore-based business tycoon) to a nearby hospital, they come across a huge stash of cash. The policemen kill the half-dead victim and flee to Chennai with the money. The sincere police officer Palaniammal (Uma Riyaz Khan) takes up this case. A cluster of lies, ego clash at the hostel, and family’s ignorance brings Karunakaran into this crime plot. The rest is a racy rollercoaster ride that forms the climax.