Six navy men are washed up on a mysterious island when their helicopter crashes into the sea. Their lives are at risk when they find the men on the island are dwarves, who consider them as monsters.

Dorai (Arjun) is a do-gooder don, but a police force led by ACP Easwara Pandian (Prakash Raj) and his sidekick (Sathyan) are after him. However, the poor need him as he is a Good Samaritan running an orphanage. He has help from his friends Subramani (Manivannan) and Ayyanar (Vadivelu). Dorai has a problem: his mother (Sujatha) doesn’t approve of his ways and feels he is just a loutish goon. There is also TV journalist Anjali (Mallika Kapoor), who is in love with Dorai because of his daredevil ways. Dorai has a past: he was just an honest-to-goodness schoolteacher who ends up as the deathly Dorai after a fire ravages a school and kills several children. The incident forces him to take on the system of venal officials and politics. Now, Dorai’s biggest task is to nip a dark and dire politician who wants to bomb the city. The rest, as they, are all cinematic clichés.

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.