The movie is a psychological thriller based on a link between a CBI officers private life and a serial murder case he is handling.

Captain Prabhakaran (Vijayakanth) is an IFS officer (Indian Forest Service) sent to Sathyamangalam to nab Veerabhadran (Mansoor Ali Khan) who tortures the people of that place. Prabhakaran is not only going to nab Veerabhadran, but also avenge the death of his friend Rajaraman IFS (R. Sarathkumar) who was a forest officer killed by Veerabhadran. The police commissioner and the district collector are corrupt and also support Veerabhadran. In the climax, Veerabhadran kidnaps Prabhakaran’s wife and son. Prabhakaran arrives at the right time and saves his wife and son. He then nabs Veerabhadran. Poongudi (Ramya Krishnan) was Rajaraman’s lover. She dies while giving birth to his child. Veerabhadran is shot dead by the corrupt inspector and collector. Prabhakaran kills both of them. He is then dragged to court for killing the police inspector and the collector. Prabhakaran tells the truth that they were corrupt, and the film ends with Prabhakaran being released from the court.

Urumeen narrates the story of a man reborn the third time after he’s betrayed by his best friend. He’s completely unaware of this until he comes across a very old book: rather, his own book since he held it in his both his previous generations. After getting the book, he also becomes a part of several unfortunate events that unfold in a series of twists and turns which lead him to discovering himself, through the book itself: how was friendship worse than betrayal and how even thinking of seeking revenge could be an honest feeling. As the film takes several turns to bring both the friends or the ‘enemies’ together, there also arrives an energetic blend of action, drama, patriotism, thrill and of course, the root solution to this: Revenge, as the tagline calls it “Always Ultimate”.

Situations push a common man to oppose an influential guy in his area and how he develops himself stronger to fight back his enemies forms the crux of the story.

The story is about a group of friends who wish to go to college together regularly. The group consists of Naresh, Sai Ram Shankar, Abhishek, Swathi and Sherin. Once, one of their friends named Lakshmi gets engaged. So the team decides to have a nice party before she gets married.

Saravanan (Sarathkumar) is a bus driver in a college. He also takes care of an orphanage which is home to numerous children and old-aged people. Indhu (Nikita Thukral), a student of the college, tries to woo Saravanan, while rowdies and other antisocial elements in the city are found dead. Chakravarthy (Mahadevan), the politico who loses his right-hand man, vows revenge and realizes Saravanan, who killed his henchmen, is an Army Major whom he and his men had eliminated years ago in a scuffle over his sister’s (Saranya) land. How Saravanan fends off the evil elements and unites with Indhu forms the rest of the story.

There are 5 stories in this movie, which joins together in the climax.

Gautham (Bharath), a college dropout and good-for-nothing guy, falls in love with Narmada (Genelia D’Souza), the daughter of a local don Sakthivel (Radha Ravi). She lives in a hostel after learning that her father is a criminal who now wants her to marry his partner Sardar’s (Brahmaji) brother. So the two lovers elope to Mumbai, and they are soon tracked and separated. Finally, Gautham, along with his friends, fights against all odds to win back Narmada.

Bio-scientist Govindarajan Ramaswamy speaks at the Jawaharlal Nehru Stadium about chaos theory and the butterfly effect. He begins by reciting events from the 12th century in Chidambaram, when King Kulothunga Chola II, a Saivite, persecutes Vaishnavites and intends to destroy an idol of Govindaraja. Rangarajan Nambi, a Vaishnavite, protects it and offends the king, who orders Rangarajan to be executed by being pierced, stoned, submerged into the sea with the idol, before being devoured by the shark, thus the king succeeding.
On 20 December 2004, a nano bio-technology lab in the United States designs a vector-virus intended as a bio-weapon. When they were watching the insound of his lab monkey breaking out of his cage and retrieving a sample of the test virus. The monkey, who thinks the vial as the usual chocolate Govind would feed him, swallows the sample of the virus. Govind and his co-workers watch helplessly as monkey dies. Govind, saddened by the event, quarantines the lab room by filling it with concentrated salt solution, the only antidote to the virus. After understanding the original virus’s lethal potential the hard way, Govind refuses to hand over the main single vial containing the virus, due to fear of misuse. However, his boss, Dr. Sethu, has a malicious plan in mind, and tries to sell it to a terrorist group. Govind tries to sneak the vial out of the lab in order to save the vial from Sethu’s evil plan, but is pursued by the security guard and the police. Govind flees to his friend and coworker Suresh’s house for refuge, who secretly betrays him.

When Sanga and her husband, part of a tribe living around the province of Mahismathi, save a drowning infant, little do they know the background of the infant or what the future holds for him. The kid grows up to as Shivudu, a free-spirit wanting to explore the mountains and in the process learns of his roots and then realizes the whole purpose of his life and ends up confronting the mighty Bhallala Deva!

Parents of first cousins, Sujatha and Raghu, decide that they will get the children married to each other on becoming adults. But Raghu becomes a troublesome character as he grows up.

The film begins at a journey in train where Paari (Jiiva) looks back at everything. Cut to the beginning, one remote village in Ramanathapuram. Paari is a do-gooder helping everyone in need. A magnanimous man, he gives anything and everything to others if they ask for. Promising his father Vasu (Azhagam Perumal) to earn more, Paari sets out to Chennai but faces more challenges. He meets a young girl Madhi (Poonam Bajwa) and falls in love with her. Some goons also cause trouble for Paari. Meanwhile, Sivamani (J. D. Chakravarthy), the dreaded but sophisticated don of the city, is getting ready to marry Madhi. When the two stories meet, chaos ensue. It is up to Paari and Sivamani to sort it out.