Theeran, a police officer, tries to decode a series of cold blood events based on same pattern. Who’s behind those ruthless events? How Theeran and team traces them? Did they succeed? forms the story of this crime action thriller. The story is based on true incidents handled by Police department in 2000s.

The movie begins at present day with Saket Ram (Kamal Haasan), an 89-year-old Hindu man at his death bed in Madras. He is being taken care of by his grandson Saket Ram Junior, a famous novelist who writes historical fiction, and their family doctor, Munawar. Ram Jr. explains how he grew up listening to his grandfather’s stories. He then narrates one of his grandfather’s strangest stories that he plans to use for his next novel. As Ram Jr. narrates the story, Ram is reminded of it.
The scene reverts to the 1940s, when he and his good friend, Amjad Ali Khan (Shah Rukh Khan) are archaeologists working together under their boss, Mortimer Wheeler, in Mohenjo-daro in the Sindh province in what was then North-West India. Relations are pleasant between the Indians and the English. Saket and Amjad do not approve of partition and the creation of Pakistan.

A young man recently released from prison teams up with his uncle to kidnap a wealthy girl, but things take an unexpected turn when her father launches his own investigation into the matter.

John Wick is on the run after killing a member of the international assassins’ guild, and with a $14 million price tag on his head, he is the target of hitmen and women everywhere.

A badass cop Vikram leads a special task force formed to eliminate a kickass Vedha’s gang running amok on the streets of Chennai, making a mockery of Law and Order. An encounter planned by a Vikram’s friend Simon, kills Vedha’s trusted aides and brings him out of hiding. Vedha lays his clutch on Vikram and engages in a disturbing mind game of sorts which results in a quest to reveal the truth behind that fateful encounter.

Sherley (Sarika) is a model who returns to Chennai after a modeling stint abroad. She received by the modeling agency and is soon drugged and operated upon. Her dead body is soon found.
Dileep (Kamal Haasan) is a photographer working for a newspaper run by Lakshmi Narayanan (Thengai Srinivasan). He is a photographer in a beauty pageant run by a rich industrialist, Oberoi (Shamasundar L. Asrani), which was won by Sharadha, Swapna and Radha (Madhavi, Radha and Swapna). He becomes professionally involved with Radha and Swapna while romantically involved with Sharadha. Soon Swapna’s dead body turns up and he becomes the main suspect in the murder investigation and is on the run from police. As his face is plastered in wanted ads all over the city and police are watching Sharadha’s house, he goes to meet Radha.
Radha, who always considered Dileep as her brother as he was always nice to her, helps him and lets him stay in her apartment. The next morning, when Dileep wakes up and turn on the tap, the water is bloody red and he hears screaming coming from the apartment water tank. He goes to investigate when a group of people are gathered around the tank and is shocked to find Radha’s bloody body inside the tank. Soon people recognize him from the wanted ad and mistakenly think that he murdered Radha. He is once again on the run from police for the murders.
He starts to investigate the murders and deduce that the only thing the two girls had in common, apart from him, was the modeling agency. When he secretively meets up with Sharadha, he finds a small incision on her body. Remembering that the other two girls had the same incision, he questions her. Although she doesn’t remember how she got it, she remembers that she didn’t have one before she left on a photo shoot abroad for the agency. She also finds it strange that she was unconscious for a few hours during the shoot but cannot remember what happened.
They eventually find out that Oberoi, has a nefarious business through his modeling agency. He drugs the models during the photo shoot abroad, operates them and smuggles diamonds into India using their bodies. When the models return to India, they again drug the model and take it out and kill the girl.
Dileep gets captured by Oberoi’s goons but with the help of his editor and his girlfriend, he has already got the truth out. Before Oberoi can kill Dileep, they hear the police siren coming towards him. Oberoi, an obsessive diamond collector, rather than get caught and go to prison, eats his own diamonds and commits suicide.

A 14-year-old forlorn Kalyani delivers a boy in seclusion, fearing societal backlash and incapacity. She abandons him, heavy-hearted, placing him inside a moving goods train, which a slum dweller finds. The slum procures him as their common child, naming him Surya and they collectively raise him honest. He grows up, intolerant of injustice especially to the poor, though he wonders why his biological mother had impetuously abandoned him. A yellow shawl was the only identity he had of his mother, which she had placed him in when casting him away.
Devaraj, a powerful don who is kind yet feared by most in the society, also fights injustice, but by violent means. Ramana, an auxiliary of Devaraj’s, whose abusive demeanour led Surya to attack him, succumbs to his death. Surya gets apprehended for this. An exasperated Devaraj soon perceives Ramana’s felony, realises Surya’s cause was genuine and bails him out. Thus, Surya and Devaraj get to understand each other as both share similar social ideologies despite getting off on the wrong foot. Devaraj declares Surya his “Thalapathi”, a best friend.

Forced to travel with her boyfriend, Laine begins to experience premonitions associated with the urban myth of The Creeper. She believes that something supernatural has been summoned – and that she is at the center of it all.

Madhan Kumar (Silambarasan) is a well-respected and well-educated Chartered Accountant by profession, who lives in Chennai and also learns music as part-time in a musical college. Mythili (Jyothika) also learns music from the same college. Mythili gets scared seeing Madhan because once she had a dream of getting raped by him. Later on, she realizes his kind nature and they both become good friends.

Auto-rickshaw driver Manickam (Rajnikant) is a do-gooder who avoids violence at all costs. Manickam romances rich kid Nagma, whose father is a criminal, and knows a dirty secret about his would-be son-in-law. Manickam’s brother, a righteous police officer gets into trouble with the local goons, triggering a set of events that revive Manickam’s old self.

Amavasai (Sathyaraj), homeless but egotistical, gets acquainted to politician Manimaran, then MLA of the Palladam constituency, near Tirupur (Manivannan). Amavasai helps Mani with some petty tasks during election campaign and meetings. Amavasai grows into a well acclaimed helper and first associate for Mani. Meanwhile, Amavasai falls in love with Thayamma (Kasthuri) and one day he gives her some drug making her groggy and then rapes her. Mani instructs Amavasai to stand for MLA election as independent candidate in the upcoming general election with his support as Mani was not given his party ticket. Amavasai wins by a huge margin and becomes the MLA. He forgets his relationship with Thayamma and rejects her pregnancy and child. Thayamma and her parents move out of that village to avoid humiliation. Soon Thayamma gives birth to a boy and dies. Amavasai forgets Mani’s help and forces him in a role under him. He changes his name to Nagaraja Cholan for gaining social status. He marries the only daughter of the rich local landlord, Sivakami (Sujatha) and even cheats him of his palace. Over the years, Amavasai grows into a highly influential and corrupt politician with high criminal affluence. He builds a strong political empire through shortcuts. His ego and pride to remain in power make him kill many. He wins and remains as MLA of Palladam in all the general elections for next 20 years.
Now, Amavasai’s son Thangavel (also Sathyaraj) through Thayamma comes out as a new police constable, who is deputed in Amavasai’s constituency. Thangavel is betrothed to a beautiful +2 studying girl Kuyili. They both fall in love. But during the official wedding engagement, a dispute arises over the people asking about his father’s identity and the wedding is cancelled. He asks his grandparents about his father, but they remain silent. So he accuses his mother to be a slut, and his granddad bashes him and tells all about Ammavasai. Thangavel now comes to know of his real father and about his betrayal of his mother and also his corrupt practices. The state assembly is about to be dissolved prior to general elections. But the ruling party leadership does not wish to give a seat to Amavasai again, as he has minimal chances of winning, due to his corruption, illegal activities as MLA. So he invokes a cruel caste riot in his constituency and pretends to stop it. So he is given the ticket again. Thangavel is posted as riot police head constable to stop riots and to protect Ammavasai. He saves Ammavasai from an assassination attempt. He then goes to Ammavasai’s house and reveals his identity. He challenges his father that he will stop all of his illegal activities. Then Thangavel gets posted as Law and Order Sub-Inspector in the same area. The story further revolves around how Amavasai and Thangavel proceed in their battle and finally who wins the battle.

Manoj a journalist sets on to find out an answer for the question “Is there any use of Porn industry to the Country? Manoj tries to find out the opinion of the common people on Porn websites,he ends up in a big jolt and shock about his findings. In this research, he happens to see his friend Ankith wife’s naked video on a pornographic website. When Manoj shares this information, Ankith kills himself in shame. Manoj begins his secret investigation, on how could a personal video get posted online. Along with Daniel, his fellow journalist and his buddy Sub-Inspector Imran he gets deep into this. In this investigation, they find out it was Vikram and his associates who operate the porn websites and their various ways and means of collecting the videos. Though Manoj writes about Vikram in his magazine with proper evidence, Vikram escapes with an anticipatory bail. How Manoj and Imran traps Vikarm and does Vikram and his associates get caught and brought to justice forms the rest of the story.