A brave police officer saves a girl from getting abducted. Although the motive for the crime seems unclear, she and her team investigate and connect the dots, leading them to a drug mafia.
Shankar is an orphan raised by a sincere police officer named Raja Rao. His son Bharath accidentally kills a kid and Shankar takes the blame on him. Shankar is imprisoned and Raja Rao warns him not to meet him again. After graduating, Shankar is employed as a circle inspector of police. He is popularly referred to as ‘Encounter’ Shankar because of his track record as an encounter specialist.
He is transferred to Bukkapatnam town in Tadipatri, Ananthapur district. He is assigned the task of halting the illegal businesses of Damodar, an influential crime boss whose dream project is to build a power plant. Using his wits, Shankar destroys all the three main businesses of Damodar by trapping their respective in-charges. He brings a stay on the power project by bringing few vital witnesses before the court of law, thereby earning Damodar’s ire. On a parallel note, Shankar loves a sweet shop owner named Saroja who reciprocates her feelings at a later point of time.
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.
Kutti Puli (Sasikumar) is a happy go-lucky good hearted ruffian, whose mother (Saranya Ponvannan) wants him to settle down. But our hero does not believe in love or marriage till he meets Bharathy (Lakshmi Menon), who changes his attitude. But his enemies will not allow him to lead a respectful family life. Meanwhile a Silambatam match breaks out into a haphazard fight between Puli and a local gang; the events turn out to become a bloodbath after the goons beat Puli up pretty badly. Post the trauma and pain, will Puli avenge his pride? What happens to Bharathi’s love? Can Puli lead a normal life that his mother always wanted to? The rest of plot unveils with all these questions answered.
Arivanandham is a man who runs a shop. He kidnaps three government officials and tells the press his name is Citizen by changing his appearance to their jobs. Meanwhile, CBI Officer Sarojini is given the case of finding the officials and capturing Citizen. She finds evidence that they link to a village called Atthipatti. She goes to a place, where they keep old maps of India. She notices that from 1970-80, the village was missing. She then inquires a Church Father who knows about Atthipatti. He gives them a box full of evidence about the village. She then discovers that the people of Atthipatti are under a old river, which is a construction site. She orders her men to dig it up, and they find corpses. Sarojini finds links to Arivadhanam but cannot identify him. Arivadhanam kidnaps the third man but is stuck in traffic. Sarojini is also in traffic. To clear the traffic, Arivadhanam creates a problem and sorts it out by donning a traffic inspector’s identity. Sarojini drops her handkerchief while in her car, then Arivadhanam swaps it with a paper and gives it to her. She accepts it, then Arivadhanam phones her and tells her she met with Citizen. Outraged, Sarojini decides to ambush his hideout. They track down his location, but he is nowhere to be found. They find masks, computers, and newspaper cuttings. Sarojini finds Arivadhanam in a mosque and arrests him. Arivadhanam is taken to court and is inquired about why he kidnapped the officials. He retells his memory.
Vetrivel is a person who lives as a temporary driver in Rishikeh, Uttranchal. Annamalai is the owner of Annamalai Transports but not the building-cum-residence of the transports and the staff. He is very innocent and funny. Vivek always arranges a marriage bride for himself but in one way or another Sundhar C. will stop the marriage. Anjali is an ardent fan of MGR and she feels her husband should also be like him. She is the very beautiful and attractive daughter of the Annamalai Transport building owner and she comes to Rishikesh to check the building’s condition and to collect the yearly rent. She meets Sundhar C. and falls in love. Sundhar C. also falls in love with Anjali and reveals his past to her. Sundar C. was a highly accomplished district collector and was transferred to Tanjore. He gets himself in a cat-and-mouse chase with local goon Naachiyaar. Naachiyaar’s son kidnaps Sundhar C.’s friend’s sister who was engaged to another man