Kumaravel (Vijay Sethupathi) is a typical lower middle class youth who mainly lives in TASMAC bars. His friends and neighbors have nicknamed him Sumaar Moonji Kumar (average-looking Kumar), and he is crazy about Kumudha (Nandita), the girl staying opposite to his flat. It is a one-way love and her father (Pattimandram Raja) has sought the help of Annachi (Pasupathy), the local boss, to find a solution and teach Kumar a lesson. On a parallel track, another alcoholic Bala (Ashwin Kakumanu), a smart bank salesperson, is always under pressure from his boss Poochandi (M. S. Bhaskar) and possessive girlfriend Renu (Swathi Reddy). One night, the life of the principal characters gets entangled, leading to the climax.

Coimbatore-based Aadhi and Jeeva have been close friends since childhood. Aadhi’s father Ramachandran is very supportive of Aadhi’s interests in music. Aadhi joins engineering and falls for his college mate Nila who was his childhood friend in school. Nila is from an affluent family and her parents are against her love and they threaten Aadhi’s parents. Post completion of college, Nila’s parents keep her locked at home preventing any communication with Aadhi.

Krishna Kumar (Prabhu Deva) is a happy go lucky Tamilian who works in Mumbai. He spends his time searching for his dream girl. He wants his life partner to be educated and have supermodel looks. He doesn’t want a country girl for a wife. His grandmother is on her deathbed and his father wants him to get married. His father with the aid of his grandmother chooses a girl from their village. He tries many times to stop the marriage but nothing works. He gets married to the girl, Devi (Tamannaah) unwillingly. He tries to get rid of her and shifts to a new house to hide her from his friends.

Radha Krishna (Sharwanand) has had a high opinion about police ever since he was a child. A B-grade Lord Krishna devotee, he grows up to be a cop because he believes that cops are the modern-day saviors the Bhagawad Gita might have talked about.

Bhoopathy (Vijay) is a happy-go-lucky person who is very relaxed in life, as shown when he falls asleep in a train and misses his station. He goes to Villivakkam in search of Vishwanathan (Nassar), who is his father Mani’s (Manivannan) best friend. Kattabomman (Vadivelu) is Vishwanathan’s assistant who torments Bhoopathy right from the day they meet. Vishwanathan’s first daughter Priya (Sneha) initially hates Bhoopathy, and they are at constant loggerheads at each other. When Priya’s aunt (Suhasini Maniratnam) is going to leave, they again fight and the same old revenge story takes place. Soon, however, Priya falls for Bhoopathy. When Bhoopathy comes to know about this, he is reminded of his father’s words that he should not make him ask forgiveness to his friend under any circumstances. Although Bhoopathy also likes Priya, he controls his emotions and keeps silent. He tries to leave but is caught by Vishwanathan and is forced to come back. Priya receives a call from her friend to come to her wedding. On the insistence of Priya’s younger sister, Vishwanathan sends Bhoopathy along with them. There the groom Sriman (Sriman) makes him drunk and he reveals his feelings about Priya. They become friends soon. Then they all go to Black Thunder and a photographer (Pandiarajan) they meet takes a photo of Bhoopathy and Priya holding hands.

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.

A wealthy businessman hires a famous filmmaker to help make a smash hit film.

Thenali Soman (Kamal Haasan) is a Sri Lankan Tamil who has come to Chennai for psychiatric treatment because of numerous phobias caused by his trauma of the Sri Lankan Civil War. Panchabhootham (Delhi Ganesh) and his assistant (Ramesh Khanna), the doctors treating Thenali, are jealous of a relatively junior doctor Kailash (Jayaram) getting all the media attention. They send Thenali over to him, believing his failure to cure Thenali of his phobias will derail his success. Soon after their first appointment, Kailash heads to his home in Kodaikanal on a vacation with his wife Jalaja (Devayani) and his two children Arjun (Master Suraj) and Aishwarya (Baby Taj Nisha). Kailash tells Thenali to wait until after the vacation before his therapy can begin, but Panchabhootham asks for Thenali to go meet Kailash while on vacation.

Ravi Teja plays a young man desperate to become a police officer. He winds up getting embroiled in a plot to pose as his lookalike in order to re-capture an infamous criminal from rogue cops.

A joint-family comprising three sons, their wives and children live peacefully, till a glamourous actress moves in next door as their neighbour. The wives go out of their way to please her.

Mano (Bharath) loves Jo (Mallika Kapoor) and becomes her friend, hoping to help her win her love for Prem (Arun Vijay), whom she secretly loves. Then they both try to break Prem’s love with Nandhini (Deepu) and succeed. Mano realizes Jo’s deep love for Prem and tries to unite them. Mano succeeds in making Prem fall in love with Jo. Finally, Jo and Prem get married. During the story, the twists reveal that Mano had originally been in love with Jo but secretly tried to engage into her life by pretending to be in love with Nandhini. Soon after realising her true love for Prem, he sacrifices his love for her and brings Prem and Jo together. Only in the last several scenes does Jo realise Mano’s love for her, but she chooses to go with Prem.

Gandhi is an IT guy who suffers from Pseudobulbar, and he uncontrollably laughs during stressful moments. He is taken to a Shiva temple and tied with a holy ornament, which is very strong, but it would bring a threat to him if separated.