Crazy, unemployed, and out of control collegian, Subramaniam, is the son of Chennai Municipal truck driver, Mani, who lives a poor lifestyle with his wife and daughter, Lakshmi. Things spiral out of control for them after Subramaniam gets in the wrong books of MLA Suri – who wants them dead at any and all costs.
The film is set in a village near Madurai. Pugazhendi (RK) spends all his time drinking and is ridiculed by everyone. In contrast, his elder brother Pandithurai (Napoleon) is respected and admired by everyone. Pandithurai showers love and affection on Pugazh. He even tries to arrange for his wedding hoping =he would reform. But knowing about Pugazh and his habits, nobody comes forward to give their daughter to him. Pugazh, who spends all his time with his maternal uncle Kaththamuthu (Vadivelu), comes across Janani (Muktha). It’s love at first sight for him. Meanwhile, the family of Rathnavelu (Lal), another powerful man in the village, is hellbent on revenging Pandithurai and his family due to previous enmity. They hatch a conspiracy and try to halt Pughazh and Janani’s wedding. Cut to flashback and the reason for ill-feeling between two families is revealed. It is now up to Pugazh to bump off Rathnavelu and restore peace in his family.
Ajith is Red (it stands for Revolution, Education, Development), an orphan who has since grown up to be the local don in Madurai. Naturally he possesses a heart of gold and when not bashing up bad guys, he spends his time forcing schools to accept students without donations and taking care of orphans. Cheeni (Salim Ghouse) is his biggest enemy. Red falls for Gayatri (Priya Gill), the daughter of his friend and confidante Narayanan (Manivannan) and helps her without her knowledge. She too likes him but wants him to give up his life of violence. Meanwhile, a reporter (Rajesh) for Ananda Vikatan begins to serialise Red’s story under the name Aadi and it becomes quite the rage among readers
Following the corruption in the higher echelons of the government, stashing of black money abroad by Indians, corruption in the Directorate of Vigilance and Anti-Corruption and travails of Indian fishermen and the Sri Lankan ethnic conflict.
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.
In Ooty, Krishnamoorthy alias Kicha (Arjun) and Mani (Goundamani) perform a swashbuckling heist of money of several crores while being in disguise diverting the attention of police, and escape in Nilgiri Mountain Railway, much to the frustration of a chasing police officer Ratnam (Ajay Rathnam). Kicha is a respected citizen who runs a home-based pappadam business along with Mani in Chennai. Susheela (Madhoo), one of Kicha’s many female employees, has a crush on him and is constantly demanding his attention. Another thing adding to her woes is the arrival of her jovial cousin Sugandhi (Subhashri). She makes the place so lively and playful with silly fights between Mani and Babloo (Senthil). Sugandhi later develops a crush on Kicha, especially after being saved by him from some molesting goons. Kicha reveals to her that he has no such feelings for her and wants her to find a suitable mate. Before leaving Chennai, Sugandhi steals Kicha’s ring as a souvenir.
Sergeant Joseph Hoover went to war to preserve the Union. After being captured and sent to a prisoner of war camp, he understood what it was to be kept against his will. Together with a friend he escaped and, aided by slaves, made it to freedom.
Kombaya Pandian (Karthi) is a butcher by profession and he leads his life by virtues. If anyone ill-treats women or cheats in business, Komban would certainly whack them for which he is celebrated by the Aapanadu village people. At one point of time, Komban falls in love with Palani (Lakshmi Menon) and her father Muthiah (Rajkiran) too agrees for the marriage. But somehow Komban does not like Muthiah. Meanwhile, few guys badly want to murder both Komban and Muthiah. Whether Komban can save his wife and father in law from the deadly guys ?
After failing in his love life, Dev finds company in alcohol. In his state, he often sees an old man who gives him hints on how his day is going to turn out. One day, he accidentally bumps into a young boy from a shelter home. He realises there is an uncanny similarity between the boy and his ex-girlfriend, so he decides to get to know the boy further only to uncover something Dev didn’t wish he knew in the first place.