Nattukku Oru Nallavan is the story of an honest police officer (Rajinikanth) and his fight against a dreaded criminal named Dddy (Anant Nag) who indulges in organ transplant mafia.

Lord Rama, son of King Dashrath is sent for exile for 14 years. His wife Sita and brother Laxman accompanies him. But she is deceitfully kidnapped by Ravana, The King of Lanka. Thus a might war takes place between ram & ravana. Hanuman with his monkey warriors, a worshiper of ram also joins him. Will Sita be saved?