Karuppasamy, a watchman, lives with his sister, Menmozhi, and her family in Tamil Nadu. Early one morning, Karuppasamy is involved in a hit-and-run accident and breaks his hip. 8 days later, he is dead. How did Karuppasamy die?

A staid doctor’s monotonous routine is shaken up when a gangster who is on the run decides to hide from the police in his clinic.

Sivadas (Kishore) the daring cop who gets ruthless against the local goon Aadhi (Pradeep Rawat) and is just miles away from nabbing the crook. He has a driver named Kundasamy. However he is forced to leave the force for a while to take care of his autistic son, Haridas (Prithviraj Das) because of an unfortunate matter. With much difficulty he enrolls Haridas in a normal school where Amudhavalli (Sneha) is a teacher specialized to deal with special children.

Two honest and bold police officers Adhi Narayanan, (Kamal Hassan) and Abbas (Arjun Sarja) devise a masterful plan to bring a terrorist group in control, and send two secret vigilance officers, named Anand and Shiva on an operation called Operation “Dhanush”. The objective is to infiltrate a terrorist group headed by a man named Badri, and relay information back to Abbas. After a year while relaying information to Abbas, Anand gets caught, but he commits suicide before the terrorists can interrogate him. With information relayed by Anand, Abbas and Adhi know that the terrorists are picking up someone important and going to Trichy.

Simbhu (Silambarasan) is elected college chairman after he beats Charmi (Charmi), the daughter of Ravishankar (Radha Ravi), a minister. Predictably, the two soon fall for each other, though they never directly reveal it. But when Ravishankar comes to know of the love affair, he is staunchly against it and is willing to go any distance to make sure that it never succeeds. At Simbhu’s house, his father (Prakash Raj) mentally tortures his wife (Seetha), since he suspects her of having an affair with her ex-lover. Outside home, Simbhu is helped by Vakkeel Dada (T. Rajendar), a lawyer who makes sure justice is served whatever the means.
The movie deals with the oldest of stories – the poor boy-rich girl love story – and makes no attempts to treat it in a different way or in an interesting manner. It follows the typical sequence of events in such stories.

The story begins with Surya (Ravi Teja) who owns a gym center and he also has a good friend Sriram (Srikanth). Surya is in love with his friend’s sister Meghna (Deeksha Seth) and after some cat and mouse games, she also falls in love. After a while, Sri goes to Saudi for a job and there he falls in love with Vaishnavi (Bhavana). The story takes a turn when Surya goes to Saudi to celebrate the birthday of Sri and is shocked when the Saudi police arrest Sriram on charges of murdering Vaishnavi. He is sentenced to death. The only thing Surya can do is to get the signature from Vaishnavi’s parents to acquit Sriram. But her father is Raja Goud (Pradeep Rawat), the bad guy whom Surya has been fighting all along. What happens from there forms the rest of the story.

A couple (Suhasini and Sathyaraj) who lost their daughter in an accident decides to adopt a girl from the local orphanage. But problems arise when the child’s real mother (Rekha) and father (Raghuvaran) seek to find her.

Meiyyazhagi, a young woman, wants to take care of her disabled brother Deva, which makes marriage a difficult proposition. Meanwhile, the village’s big shot lusts after her and plots to marry her at all costs.

Shiva Raman (Prashanth), an easy-going young man, comes to London in search of a job, but he loses all of his certificates. He finds Kathiravan (Pandiarajan) wandering in London aimlessly without a job. Now, they both need jobs and money. Kathir persuades Shiva to join a bank robbery planned by Bhaskharan (Manivannan). His stammering brother Natrajan (Mayilsamy) and Aishwarya (Mumtaj), who is the former’s lover, lands them in more trouble, as the robbery ends vainly. Aishwarya informs the police about the robbery and tells that the entire plan was hatched by Bhaskar. Bhaskar hides the money before getting arrested, and the place is known only to his lawyer Vedimuthu (Vadivelu). Aishwarya fakes to be in love with Vedimuthu to find where the money is hidden.
Meanwhile, to find a safe cover, Shiva and Kathir plan to imitate Saravanan, the grandson of a rich elderly couple: Shiva Kumar (Vijayakumar) and his wife Parvathi (Srividya). They have not seen their grandchild since his birth. Shiva and Kathir end up disguising Kadhir’s body and Shiva’s voice to make up for Saravanan in front of the blind couple. Ganesh (Delhi Ganesh), who knows Kathir before, makes several attempts to expose the truth to the couple, but all fails, due to Shiva and Kadhir’s luck. All of a sudden, Anjali (Ankitha) arrives in the disguise of Saravanan’s lover. She calls on all the relatives of Shiva Kumar and Parvathi. The relatives arrive in Shiva’s absence. Finding no way out, Kathir pretends to have fainted unconscious, and he gets admitted to the hospital. Shiva comes to his rescue, and says that he is Dr. Karthikeyan, a friend of Saravanan from America….

Vaanavaraayan (Rajinikanth) is a feudal chieftain, adored and respected by the people of his village. He lives with his grandparents (M. N. Nambiar & Manorama). Following his advice, they abstain from voting in the elections and instead, pool the money given by the candidates to get themselves some basic amenities. Vallavaraayan (Napoleon) is his arch enemy. Their enmity is further sharpened when Vaanavaraayan wins the hand of Vaitheeswari (Meena), whom Vallavaraayan had also wished to wed. Vallavaraayan then convinces the priest of the village temple to mix poison in the holy water that Vaitheeswari drinks. As a result, she becomes incapable of conceiving a baby. But surprisingly, Vaitheeswari soon becomes pregnant-though she has pretended with the help of the mid-wife (S. N. Lakshmi), to do so to uphold her husband’s honour. She takes poison and kills herself unable to bear the grief of being incapable of giving her husband a child and on her deathbed makes Vaanavarayan swear to take Ponni (Aishwariya) as his wife. Vaanavarayan however refuses until Ponni agrees to marry Sembattai (Thalapathi Dinesh)- Vallavarayan’s hechman-who abandons her to Vallavarayan’s vice. Infuriated, Vaanavarayan attacks Vallavarayan and spares his life after giving him a sermon on how to win the heart of the people.

Hero Vijay played by Mathivanan relocates to Australia as a result of his job transfer. There he meets an Australian girl, Emily played by Melissa and falls in love. Meanwhile, Australian Police are in search of Emily who is claimed to be missing for the past 10 days. Meantime, Police find Emily’s dead body who was killed and buried in Vijay’s garden and hence he is arrested. Emily’s postmortem report says that she was murdered and was buried. Further it shocks the police as they find that Vijay had actually arrived at Australia, a day after Emily’s murder. As a result, Vijay is released by the police. Following which, Vijay is all set himself to find about Emily, that who was she actually, who would have murdered her and what would have been the reason behind it, how is it possible for a dead girl to meet and speak wit him.. Finally, all these investigations result to unfold many interesting and shocking informations.

An educated do-gooder is forced to enter politics in order to serve society. But, will the old guard make way and allow him to do that?