Dilli, a convicted criminal, is out on parole to meet his daughter. However, a drug bust sets him off on a mission to save the life of police officers.
Murugan is the go-to man for MLA 'Jacket' Janakiraman who is in the good books of the minister of state. Murugan falls in love with an aspiring cop, Archana and tries to make her a cop using his rapport with Jacket. The minister on his deathbed, confides with Jacket where he has stashed billions of cash but an irked relative leads him into an accident that wipes out his memory. Murugan and Jacket's attempts wriggle out of the situation is what the rest of the movie has in store.
A revolutionary is sentenced to death for his anti-national activities. And so begins a battle of wits between the prison officer and his comrades, who try to rescues him with the help of the reluctant hangman who has been selected to deliver the punishment.
Akhilan and Vimalan are the conjoined twins of genetic scientist Ramachandran, whose company makes Energion, a dietary supplement that promises to make geniuses out of children. When Russian journalist Volga tells them that there is something fishy about Energion and is mysteriously found dead, their lives are turned topsy-turvy.
Ajith is paranoid about getting married. Jyothika arrives at his place and begins to compel him to get married to her. The reason: Ajith was pouring his love out to someone else thinking that she was Jyothika! Under the cover of darkness Jyothika confesses her love for Ajith. Thinking that it was Priyanka Trivedi who was speaking to him, Ajith begins to love her. Suddenly, a villain pops out of nowhere and causes the death of Priyanka. Then, finally, after dilly dallying for a very long time, the story ends with the coming together of the lead pair of Ajith and Jyothika.
Veerapathran, a dacoit keeps evading the cops. Prasath, an agricultural officer falls in love with Parvathy, a relative of Veera. She is horrified when he reveals his true identity and motive.