The film starts with a flashback. ACP Bose (Karthik) is a sincere police officer happily married. He lives with his parents and younger brother Velu (Arun Vijay). Velu is a college student, and he falls in love with his classmate Anjali (Dhansika). Enters Umapathi (Chandrasekar), the villain who is notorious for settlements and land deals. Anjali comes across Bose when she is on a field trip from her college with her friends. She gets friendly with his daughter Pinky, who tells her that she would get her introduced to her uncle Velu, and they would make a good pair. It turns out that Velu studies in Anjali’s college and soon after, they come to know each other and get close.
Bose investigate the case of Umapathi, whom no one has been able to touch. He is even involved with a land deal involving crores of money which is completely illegal and others including the DIG is involved. When the chairman of the bank who has lent money for the deal demands the money back as the deal has not worked, Umapathi eliminates him.

Murugappa ‘Munaruna’ (Dhanush) is a Tamil worker in 1960s Burma. His friend Saamuda falls in love with Mallika, but Mallika loves Munaruna. Munaruna saves Samudra (Amyra Dastur), the daughter of a Burmese army general, from a Ferris wheel accident and they fall in love. When Mallika learns about this, she is devastated and marries Saamuda. The Burmese general disapproves of the union between Munaruna and Samudra, and revokes the privileges that the Tamil immigrants had until then. Violence breaks out and the Tamil nationals flee Burma. Munaruna and Samudra join the refugees on a ship with Saamuda and Mallika. When Samudra’s father comes looking for her, Mallika spitefully reveals where they are hiding. As Samudra and Munaruna try to escape by diving into the ocean, Munaruna is shot and killed. Samudra handcuffs herself to Munaruna and drowns with him after promising to be together forever.

To earn some quick money through betting, Ravi, a jobless youngster, crosses path with Bittu, a criminal, by foiling his bank heist. Since then, Ravi has to use his wits to escape the wrath of Bittu.

Follows dangerous criminals on a cargo ship who are transported from the Philippines to South Korea, as they unleash a sinister force after an escape attempt leads to a riot.

Shivshankar, a person who uses a wheelchair, tries to make his son, Vishnu, aware of his responsibilities but to no avail. Things take a turn for the worse after Vishnu tries to rape a girl.

Kadhal Konden fame Ajaay plays a college student who is a part of Friends of Police. He helps the Police department through Friends of Police from the Home Guard (India).

Thiru, a local gangster, falls in love with Charu, an NGO worker, and decides to marry her. He changes his profession and starts a new life, but the police arrest him for his earlier crimes.

Inspector Ajit Rathod (Ajay Devgn) is on a mission to eliminate a notorious terrorist Azhar Khan (Rahul Dev) who killed his wife (Koena Mitra) and the latter is underground from the eyes of law and planning to destroy Mumbai. Now the story moves on to Amjad (Akshay Kumar), an auto rickshaw driver, who is searching his long lost brother Munna, and struggler Avinash (Tusshar Kapoor) who wants to be a star in Bollywood industry. Amjad wants to marry his lover Heena (Esha Deol). But her parents want her to marry a rich man. So Amjad plans to win her parents’ trust by a fake drama with Avinash and his friend to act as fake goons and they involve Rathod to arrest and win Heena’s heart. The plan goes wrong as real goons appear but Amjad fights them leading t Heena’s parents agreeing to marry her to Amjad. Avinash, who is a struggler, on the other hand, loses his job as an extra in films after an argument with an egoistic actor. A newcomer Indu (Laila Mehdin) is helped by Avinash to enter the industry and soon both fall in love with each other not knowing that she had been subjected to a compromise with the producer. Hopeless, Avinash decides to be an auto-rickshaw driver but Indu apologises and encourages Avinash to be a good actor. Soon, Avinash and Indu’s luck turns when the filmmaker (Asrani) casts them as leads in his next film after being impressed on their acting skills. Meghna, a news reporter (Lara Dutta) develops a liking towards Rathod, but the latter is still traumatised and angered on his wife’s death.

Easwaran (Arjun Sarja) is an upright, honest youth who runs a local cable channel in Kumbakonam. He is known to fight for causes of the society and the common man. He enters into fisticuffs with local MLA Poongundran (Sai Kumar) after he exposes his corrupt and greedy ways through his cable TV channel. Fearing trouble, his mother takes him to a saint in Thiruvannamalai. The Swami resembles Easwaran. A sequence of events forces them to swap places. The soft-spoken Swami tries to sort all issues through non-violent means (Gandhian philosophy). Halfway through, Duraisingam (Karunas) dies in the hands of Poongundran and his henchman (Vidharth). In the climax, Easwaran kills Poongundran.

Viswanath (Rajinikanth), a famous lawyer, stays with his widowed mother (Vijayakumari) and physically handicapped sister (Uma). He sends Jegan, a rich magnate’s son (Sathyaraj) and Lokaiya, two criminals to jail on the charge of rape and murder of an innocent girl. Jagan’s father, GMK (M N Nambiar) uses his influence and starts creating trouble in Viswanath’s life. GMK succeeds in getting Viswanath imprisoned on a trumped up charge. His heartbroken mother dies. Once out of jail, Viswanath sets out to punish the culprits when he temporarily loses his eyesight…

A gang has kidnapped a girl and several police officers, including Karthik (Sibiraj), who is attempting to rescue her. During a shootout, one man from the gang and a police officer Arul (Raghav Umasrinivasan), who is a good friend of Karthik, are killed, while Karthik gets injured. He is put out of action and suffers from posttraumatic stress disorder.
Subramani (Idoh) is a trained military dog who has the potential to nab culprits and to decipher a crime scene. After its owner, an army officer, is shot dead, Subramani is returned to the officer’s father in Coimbatore, who is a neighbor of Karthik. The neighbor leaves the town and requests Karthik to provide shelter to Subramani during his absence. Karthik denies the request but provides shelter after seeing Subramani being troubled the small kids in the neighborhood. Karthik learns about Subramani and becomes good friends with it.

Major Kathiravan (Vishal) is a military official who, with the hope of resuming his job, is working on anger management issues under chief psychiatrist Rathi Devi (Samantha Akkineni). Upon hearing his flashback, she counsels him to go to his village and spend time with his father (Delhi Ganesh) & sister (Darshana Rajendran). As a proof, she orders him to upload a picture daily on social media. Kathiravan, who hates his father due to his habit of borowing money , reluctantly does this and posts every picture on Facebook. Soon, he finds out about his sister’s love affair and wants to get her married to the lover, but his sister orders Kathiravan to stay away from her personal zone as he was never a responsible brother. Kathiravan realizes his mistake and finds out the truth that his sister’s future mother-in-law demands them to bear the marriage expenses which will cost around 10 lakhs totally. He promises to fulfill his sister’s wish.