When a meteor shower rains down outside Los Angeles, Lars and Jonas, two friends stuck in tired, boring lives, head out to find one and strike it rich. After recovering one, they start being stalked by Terrordactyls, ancient flying reptiles, that launch a full-on assault on the city. They go on the run, trying to survive, where the unlikely heroes, along with Candice, a tough-and-sexy bartender, Valerie, her sultry roommate, and Sampson, a constantly drunk and sassy ex-marine, soon discover that there’s more to the meteor than meets the eye. They must learn to put their differences aside, and fight back to make the Terrordactyls extinct once again.
The story revolves around a Tamil pop singer Inderjeet based in Bangalore who has a large female following. The movie opens with the death of a back-up dancer, Sandhya, in Inderjeet’s group. Soon a police detective is put in charge of the investigation. Although the police suspect Inderjeet as he is very short-tempered, they have no evidence linking him to the crime. Meanwhile, Divya, Sandhya’s sister, arrives at her aunt Dr. Prabhavathy’s house to find out the truth about Sandhya’s death. She goes to meet Inderjeet but is put off by his arrogance. She talks to his manager, Dr. Harichandra Prasad, and other musicians who all have differing opinions about Sandhya.
The movie begins with Jeeva (Sketch) narrating his story. His uncle used to tow and bring back vehicles for which the monthly EMI had not been paid. However, during a fight, he loses his hand, and Sketch gets the job. Sketch does his day-to-day job perfectly. His uncle’s right-hand Ravi wanted to take over the business. However, Bhaskar Settu (Boss) agrees with Sketch coming up to the position. One day at a college, Sketch tows a scooter that belonged to Manju, Ammu’s friend. Another day, he happens to meet her on a bus. When some other guy tries to touch her, Sketch bats away his hand. At the same time, the bus stops quickly, causing Sketch to bump into Ammu. She mistakes this as him trying to make advances on her and yells at him. Only later does she realize he was trying to protect her, and she falls in love with him. One day, Sketch loses a bike while bringing it back to the garage. The owner gets angry and demands 2 lakhs from Settu. Sketch realizes this was a plot by Ravi to embarrass him. He faces them to get back the stolen bike and the money.
Balu (Vishal) visits his friend Karthik’s (Raja) home in Chidambaram after completion of engineering. He meets Hema (Meera Jasmine), Karthik’s sister, and they develop an affection which transforms into love. Kasi (Lal) is the local gangster in Chidambaram who is feared by the entire town. Balu, on his way back to his place, sees Kasi chasing a man with a sickle. When Kasi was about to kill the man he was chasing, Balu interferes and stops Kasi. An angered Kasi immediately tries to attack Balu, and to save himself, Balu retaliates by hitting Kasi. Only then, Balu comes to know that the person he hit is Kasi. To everyone’s surprise, Balu smashes Kasi in front of everyone and leaves.
Kasi is furious and wants to take revenge on Balu. Kasi’s men trap Karthik’s father and get to know about Balu’s native place. Kasi sets goons to kill Balu but gets shocked when he knows that Balu’s father is Durai (Rajkiran), a powerful man in Madurai, and it will be very difficult to attack them. Kasi leaves to Madurai and waits for the right moment to kill Balu and his family. Meanwhile, Balu meets Hema and her family at a temple. Hema’s father initially gets angry seeing Balu as he was responsible to bring trouble by hitting Kasi, but later, Balu convinces him. Both the families decide to get Balu and Hema married to each other.
One day, Kasi tries to kill Balu but instead attacks Durai. Durai understands that Balu is being targeted and decides to protect him. A localite in Madurai (Thalaivasal Vijay) hates Durai and his family and decides to help Kasi so Durai can get killed. Kasi decides to bring in violence during a temple festival day and utilize that opportunity to kill Balu and Durai. But Balu saves Durai and fights Kasi. In the end, Balu hits Kasi and leaves, challenging him to return if he still has guts to take revenge.