Deva and Shiva (both played by Ajith Kumar) are twins. Deva, the elder, is deaf and mute; but he is a genius, an expert at lip-reading, and the head of a successful advertising company. Shiva loves and trusts his brother. Priya (Simran) wants to marry someone who is an ex-smoker, ex-drunkard, and who got ditched by a girl but is pining for her. Learning this, Shiva, with the help of his friend Vicky (Vivek), invents an old romance between him and Sona (Jyothika), and finds his way into Priya’s heart.
Meanwhile, Deva chances upon Priya and lusts for her. His obsession continues even after his brother gets married to the girl of his dreams, and he devises various means of getting close to Priya and keeping Shiva and her separated.

The film details on how the parents of a young teen aged boy diagnosed with chronic brain tumor accept and deal with his sickness, Anjali (Richa Ahuja)’s undeterred love for the optimistic Ajay who is on the verge of death is beautifully depicted throughout the film.

Vasu (Ajith) is a ruthless rowdy who lives in a cinema theater owned by Vinu Chakravarthy. He had a tortured childhood and wastes his days by drinking, fighting, and sleeping. It all starts when Vasu’s friend Dhamu loses an Annamalai movie reel to Mohana (Shalini). Vasu and Mohana clash when he attempts to retrieve the reel. Mohana’s family are members of the police, headed by Birla Bose (Nasser), Mohana’s father. At this point, Tulasi Das (Raghuvaran), an ex-mafia “dada” who spent many years in jail because of Bose, comes to the theater. He does not like Bose and hires Vasu to kidnap Mohana. He cries out his woes in the song “Satham Illatha.” Mohana falls in love with him after hearing his pain. When Tulasi realizes Mohana loves Vasu, he hires Vasu to pretend he loves her back. At first it is just pretend, but then he too begins to love her. Tulasi visits Bose to inform him of his daughter’s love for a gangster and realizes Mohana is indeed his daughter. A flashback showing the parted friendship between the two men, and Ganga (Raadhika), Tulasi’s wife, abandons him and their child when she comes to know her husband is a don. Knowing Mohana is his daughter, Tulasi instructs Vasu to give up his love. When Vasu refuses, Tulasi visits Mohana and tells her about his ploy and that Vasu’s love for her was fake. Eventually, Vasu proves to Mohana his love was true and unites with her after a clash between the cops and some goons of the locality.

Gowri, daughter of a rich man, loves Raja. But, he keeps avoiding her. He stopped believing in love after his dear friend met with a tragic end due to a failed affair. Will Raja ever change his mind?

A celebrated covert operation specialist Ajay Kumar is assigned a high risk mission to retrieve the detonation codes for deadly plutonium weapons stolen by terrorists to upset the world order. After putting his unparalleled skills to use he finds himself on the verge of successfully completing the mission, only to be shocked by treasonous acts which he wouldn’t have even dreamt of. He is then left to deal with overwhelming odds stacked against him in order to survive.

A doting brother who works as a cab driver tries to hunt down three notorious criminals in Kolkata who had harmed his sister.

Selvam and Bhaskar, two thieves with good intentions, hide with the help of Radha who is an illegitimate child living with his father’s family in the guise of a maid.

Amravathi is a naive girl who runs away from home. She finds shelter in a kind-hearted man’s house where she is well taken care of. Her life takes a turn when Arjun falls in love with her.

DCP Paramaguru (Ajith Kumar) is an efficient police officer who fights with the scum of the society. He later masquerades as a thief to infiltrate into the underworld. The bad guys are surprised to find that Paramguru is the DCP, out to get them. So they all gang up against him. In this process, a thrilling encounter takes place between the good and the evil. Paramaguru is helped in his fight against injustice by Divya (Meera Jasmine) who falls in love with him.

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.

Surya (Ajith) has been brought up in the army training barracks in Wellington (Ooty), ever since his mother(Sukanya) handed him over as a baby to the camp brigadier (Nasser). She tells the officer the reason for her action but the audience is not allowed to hear it at this point. Surya grows up to be a patriotic youth and the best soldier in his class. He is about to complete his training in 3 months and leave to the border. He falls in love with Indu (Simran), the daughter of a senior army officer, who is visiting Wellington Camp. Indu’s parents accept her choice of husband and the family leaves to kashmir. Soon after, Indu’s father dies in a bomb blast while her mother loses her life on seeing her husband’s body. Not wishing to lose her husband too in war, Indu asks Surya to choose between her and the army. Surya then asks the brigadier to advise him, and the brigadier tells the story of his parents. His father Bomb Sekhar (R. Parthipen) was a very violent terrorist, who was sentenced to 3 years prison and death. His mother was a nun, who visited prisoners and chanted Bible verses to them.

Thirupathi (Ajith Kumar) is a straightforward young man who leads a happy life with his parents and younger sister. He happens to meet Priya (Sadha), and both fall for each other. Thirupathi’s sister is pregnant, and at the time of delivery, he takes her to a hospital. The doctor there expects bribe, but when it is not forthcoming, he neglects his duty; therefore, Thirupathi’s sister dies. Thirupathi comes to know that this is not the first instance in the hospital, and the doctor is his best friend Soori’s (Riyaz Khan) brother (Sampath Raj). When Thirupathi goes out to get Soori’s brother, Soori and his father do all that they can to protect him from Thirupathi. How Thirupathi gets his revenge on the people responsible for his sister’s death forms the rest of the movie.

The movie begins with Jeeva (Ajith Kumar), a driving instructor, leading a happy life with his mother (Sujatha). He also fell in love with Swapna (Pooja Umashankar) after several mishaps. Sujatha hides the Jeeva truth that his father (Nizhalgal Ravi), was murdered by a dada named Manthiram (Babu Antony). The mother, much against the boy’s wish, packs off Jeeva’s twin brother, Guru (also Ajith Kumar) with a family who offer to adopt him, who had been witness to the murderer from a close quarter, to a distant town. He escapes from the family and goes to Tuticorin and grows to become a gangster there.
When Jeeva visits Tuticorin, he comes across his elder brother, Guru a.k.a. Thala. Seizing the opportunity, the elder brother kidnaps the younger one and decides to go as the driving instructor to Chennai. Initially, he plans to take revenge on his mother for packing him off from their house at a very young age. He hurts her at every step and even plans to sell off all their property.

This film is about the family of Kumar (Ajith) and his Uncle Bala Singh (Rambha’s father). The problem between two families start when Kumar is unable to spend too much money for an occasion in his uncle’s family. Whether Kumar and Meena (Rambha) get united after solving out all the problems forms the crux of the story.

Sakthivel (Ajith Kumar) is an implicitly obedient son of a sincere policeman Rajarajan (Rajkiran). Sakthi and his father share the same dream: that of seeing him enter the police force. The entire family comprising 2 other daughters, the mother (Saranya), and a wastrel of a brother-in-law (Vivek) are cuddly and close-knit. Rajarajan is from the old school of life, and honesty is his watchword. In a venal system, this lands him in trouble often. Divya (Trisha Krishnan) is a charming college student. She has some comical run-ins with Sakthi and eventually falls in love with him. Elsewhere, Rajarajan, who books an MLA’s son for an offence, is hauled up over the coals and sent on a ‘punishment transfer’ to a place, which is run as personal fief by a local dada Varadarajan (Ajay). One thing leads to another, and Sakthi is unwittingly sucked into the unholy vortex. Just as he is about to join the police force, destiny decrees otherwise: his life is not going to be the same again. A father’s dream lies shattered while a son, despite his unwillingness, has to fight an honest war beyond the matrix of a law. It is a situation that is actually an emotional cauldron. How the father and son reconcile to the new reality is the story.

The underworld don Billa (Ajith Kumar), featured on Interpol’s criminal list, is hiding and operating out of Malaysia. DSP Jayaprakash (Prabhu) has spent the last few years looking for Billa, leaving behind a life in India.
During a chase with the police, Billa is severely wounded after an accident and dies in front of the DSP. The DSP then secretly holds a burial of Billa. Interpol officer Gokulnath (Rahman) is assigned to work with DSP Jayaprakash to capture elusive Billa as no-one knows of Billa’s death. DSP Jayaprakash keeps the death of Billa as a secret even from his fellow officers, and tracks down a look-alike called Saravana Velu (Ajith Kumar), a lowly pick-pocket. He asks Velu to infiltrate Billa’s gang by pretending to be Billa. In return he will make sure that the child Velu adopted, Karan, gets a proper education.