Vasu (Ajith) is a ruthless rowdy who lives in a cinema theater owned by Vinu Chakravarthy. He had a tortured childhood and wastes his days by drinking, fighting, and sleeping. It all starts when Vasu’s friend Dhamu loses an Annamalai movie reel to Mohana (Shalini). Vasu and Mohana clash when he attempts to retrieve the reel. Mohana’s family are members of the police, headed by Birla Bose (Nasser), Mohana’s father. At this point, Tulasi Das (Raghuvaran), an ex-mafia “dada” who spent many years in jail because of Bose, comes to the theater. He does not like Bose and hires Vasu to kidnap Mohana. He cries out his woes in the song “Satham Illatha.” Mohana falls in love with him after hearing his pain. When Tulasi realizes Mohana loves Vasu, he hires Vasu to pretend he loves her back. At first it is just pretend, but then he too begins to love her. Tulasi visits Bose to inform him of his daughter’s love for a gangster and realizes Mohana is indeed his daughter. A flashback showing the parted friendship between the two men, and Ganga (Raadhika), Tulasi’s wife, abandons him and their child when she comes to know her husband is a don. Knowing Mohana is his daughter, Tulasi instructs Vasu to give up his love. When Vasu refuses, Tulasi visits Mohana and tells her about his ploy and that Vasu’s love for her was fake. Eventually, Vasu proves to Mohana his love was true and unites with her after a clash between the cops and some goons of the locality.

An Indian soldier is assigned a mission to eliminate his former mentor, who has gone rogue.

Tamil, a young IT professional, is raised single-handedly by his grandfather but later moves to the city. His relationship with his grandfather deteriorates after the latter causes him embarrassment.

Jai Mohan (Mohanlal) leads a double life, he is a special agent of a special task force of the Indian government created to counter terrorism in India. Jai Mohan and his chief Shaheed Khadar (Sathyaraj) operate in Bengaluru under a cover setup of exporting business under the name “Deccan Exporters”. Jai falls in love with Anjali Menon (Amala Paul) and marries her, for the reason he is constantly hazed by his chief.
One day, Anjali follows Jai on suspicion of having an affair and accidentally meet each other, which he is forced to reveal that he is an undercover agent who operates as a civilian. Meanwhile, Victor Rana (Rahul Dev) a terrorist who was caught and locked after Interrogation escapes by trick. To catch Victor Rana, Shaheed asks Anjali to act as Laila, a bar dancer, Victor’s girlfriend. Anjali finally agrees and is trained as a regular in bar dancing.

Pandi is a sincere and dedicated worker who will not get angry, stressed out or nervous even when he is provoked by others. The film follows the story of this honest man as he commits in everything that he does.

A fearless commando arrives home at the news of his brother’s suicide until he starts to deeply investigate the reason behind his mysterious demise.

The young warrior Son Goku sets out on a quest, racing against time and the vengeful King Piccolo, to collect a set of seven magical orbs that will grant their wielder unlimited power.

Jeevanandham is a social activist who fights against a monstrous MNC company to restore farming. Because of destiny, Kathiresan impersonates Jeevanandham and leads the war.

Prabhakaran suffers from an alternative personality disorder and has killed many people. He meets Anitha who finds out about his condition.

A freaky incident during a man’s breakup party leads to an ultimate change in his life as uncalled situations pop up, eventually leading to a lot of frenzy.

The film revolves around Kathavarayan (Karan), who sells illicit arrack in Hogenakkal. Though he is involved in arrack trade, he is a man with golden heart. Malathy (Vidisha), a student, comes to the village as part of her NSS project. She vows to end the arrack menace in the village and takes efforts to arrest Kathavarayan. Thanks to her efforts, Kathavarayan gets arrested and lodged in prison in Chennai.
Call it fate, Malathy is arrested for no fault of her in Chennai. Her efforts to expose drug-pedlers in Chennai backfires. They hatch a conspiracy and Malathy falls a prey to it. She gets arrested for possessing drugs and lands in prison.

Koottam is about the Naxalites, the police, some politicians and the connections between all of them.