Brahmin boy Satya (Navdeep) comes from Nagercoil to Chennai to join an engineering college. His problems begin when he encounters his father, the dreaded don Adhi Narayanan (Prakash Raj), and Adhi’s adopted son Kutty (Arya). Satya’s girlfriend Sandhya (Sameksha) is wounded in a shootout between Adhi’s gang and his rivals. Satya, on the prodding of ACP Thiagarajan (Adithya Menon), is all set to identify Kutty as the culprit. Intimidated and threatened by the gang and in a state of confusion, Satya is shocked when Adhi and Kutty make friendly overtures to him. Satya’s life takes a comical and drastic turn.

Two lovers, Pallavi and Uma get separated by circumstances, but reconnect years later, when Pallavi is happily married to someone else.

Circumstances push a bus conductor behind the wheel and what follows is death and chaos.

Maruthu (Vishal) is a labourer from Rajapalayam who personally does not tolerate injustice anywhere. He leads a happy life with his grandmother Appathaa (Kulappulli Leela) and his younger brother Kokkarako (Soori). One day, he encounters Bhagyalakshmi alias Bhagyam (Sri Divya), a bold young woman, at a temple, but their first meeting does not go well due to a misunderstanding, and he ends up at a police station. However, with Appathaa’s help, Maruthu soon manages to win Bhagyam’s heart. One day, he sees some goons chasing Bhagyam and her father (G. Marimuthu) near the market where he is working. Maruthu beats up the goons and then learns from Bhagyam’s father why the goons are after them.

Meena and Geetha fall in love with two guys, who apparently are college professors. The girls’ brother Krishnamurthy, an MLA, abandons the plan to get them married to ministers’ sons and reluctantly accedes to their wish. The girls are married off to their respective lovers, only to learn that the duo are not college professors, but two unemployed youths in search of jobs. Thrown out of the house by the furious family, the men open a fast food eatery to prove a point to their unforgiving wives. How the matter is resolved forms the rest of the story.

Four friends who live in an apartment get gruesomely murdered one after the other by an unknown power, which leads to an insecurity among the residents there.

Shakti (Madhavan) is a young man from a village with no job but much ambition and dreams. As he sees his life pass him by, stuck in a rut in his hometown, he decides that he will try his fortunes elsewhere. Chennai beckons him and off goes Shakti to join his uncle Kirikalam (Vadivelu), who has a stall of magic tricks at an exhibition. Kirikalam is not really a magician, but is posing as one, and his amateurish tricks don’t exactly bring in big crowds.
Next door to Shakti and Kirikalam’s stall though, is one ever-populated with visitors. The reason: it’s an all-girls stand, with mermaid costumes as the theme. Velli (Reema Sen) is the ‘head mermaid’ at this stall run by her sister, and bitter quarrels between her and Shakti ensue, when he feels that she and her team are unfairly taking their customers away, and she has this impression of him being an unsavory character. This misunderstanding is seen at different occasions where Velli and Shakti just happen to be in the wrong place at the wrong time — be it when Shakti gets off the bus from his village, asks for directions and is told to follow Velli, walking in the distance (Velli thinks he’s a womaniser) or when Shakti finally catches up with a miscreant who had picked his pocket and demands his money back — only Velli walks into the scene only at the demanding part. This whole collage of scenes is animated, with Kirikalam and Shakti trying to woo customers back to their stall, Shakti and Velli getting into arguments, and a general state of “fun” ruckus. Of course, love has been brewing as an undercurrent between the two young people.

Karan (Shahid Kapoor) is a shy and nerdy canteen boy and college student, running a café with his friend Murugan (Johnny Lever), and Tanya (Rimi Sen) is a student in the same college. She is the most popular girl on campus. Karan is in love with Tanya but is too shy to tell her. After he musters some courage and rescues her step-brother from some goons, he catches her attention and is eventually able to invite her to a fake birthday party. On her way there, Tanya witnesses the murder of a scientist, Khurana (Om Puri) by his evil twin brother, the underworld don Mehboob, and as a result is forced to flee the country to save her own life, since the law had been bought out by the very same killers. The scientist had stored a secret code in a stuffed toy, a parrot, now being sought by Mehboob, and Khurana was able to hide the toy in Tanya’s car before being killed. Unawares, Tanya leaves the toy at home before fleeing the country, and the toy is later picked up by Karan, ignorant of Tanya’s fate.

The true love between a couple in 1910, 1960 and 2012. Their love is so strong that even destiny wants to bring them together.

Desperate brain cancer-ridden Caucasian George States, with only six months to live, decides to capture a male cobra with hopes of obtaining Nagmani from the shape shifting Naga female. For reasons that remain obscure throughout the film, this will not only cure his brain cancer but also make him immortal. He hires workers in the jungles of Natchi, Tamil Nadu, who witness the intimacy of the cobras, and capture the male, allowing the female to escape. George then holds the male cobra in a glass cage in the hopes that the female cobra will attempt a rescue, and he will then release it in exchange for the Nagamani. The region experiences horror and religious awakening after the enraged female cobra. With the image of its oppressor in its eyes, sheds its snake skin and takes on a female human form, setting out on its deadly mission of tracking down and destroying her mate’s oppressor, and whoever else gets in her way, whether involved or not.

The plot revolves around Shekhar (Shiva) from Madurai who is ardent fan of powerstar, the superstar. it depicts the extent to which fans can go in their adulation. Shekhars longtime girlfriend Devi (Naina sarwar) caters to his financial needs.

Manimaran (Sarath Kumar), his father Poochi (S. V. Ramadas), and his grandfather Nagappan (M. N. Nambiar) are short-tempered persons who beat the villagers for a simple quarrel. Only, Manimaran’s mother, Sivagami (Lakshmi) can control them. Uma (Rajeswari), Manimaran’s sister, gets married to a man of another village. Manimaran falls in love with Vaidehi (Devayani), a Brahmin girl, and gets married to her without her permission. In a fight against Manimaran, the antagonist becomes blind in one eye and decides to take revenge on Manimaran. When Manimaran drives his pregnant sister, the antagonist stops him but Manimaran beats the antagonist and his henchmen. Uma comes too late at the hospital and dies with her baby. Vaidehi leaves their house because of her husband’s behaviour who brings Uma’s death. Manimaran changes his behaviour and tries to convince Vaidehi to come back home.