Maruthu Pandi is a 1990 Tamil action drama film directed by Manoj Kumar. The film features Ramki, Seetha and Nirosha in the lead roles, with Nassar, S. S. Chandran, Senthil, Kovai Sarala, Raghavi and Pradeep Shakthi playing supporting roles. The film, produced by S. Selvarethinam, had musical score by Ilaiyaraaja and was released on 27 April 1990.
In the village Ammapatti, Maruthu Pandi (Ramki) is a coracle operator the day and the village protector the night. The villagers give him food in exchange of his work. Maruthu Pandi has a mentally ill sister Lakshmi (Raghavi) who is pregnant and he takes care of Lakshmi like a mother. Kanagavalli (Seetha) is a dancer performing in a dance troupe. After performing their dance in Ammapatti, the dancers leave Kanagavalli alone.
The villagers helps Kanagavalli to stay in the village : they build a house for her. Kanagavalli slowly falls in love with Maruthu Pandi.
Kanagavalli is in fact a police officer who wants to arrest Maruthu Pandi. Maruthu Pandi's real name is Manickam In the past, Manickam was poor tailor, he lived happily with his only sister.
Manickam was in love with Kavitha (Nirosha), daughter of a rich zamindar. Her father Jagannathan refused to marry Kavitha with Manickam and he wanted Kavitha to marry a zamindar like him : Inspector of Police Thiagarajan (Nassar). The day of the wedding, Kavitha drank poison and died. The same night, Jagannathan, Thiagarajan and Thiagarajan's friend Pradeep (Pradeep Shakthi) beat up Manickam. Thiagarajan brutally raped his sister Lakshmi. Afterwards, Manickam managed to beat up them, he killed Kavitha's father in the process and he fled with his sister from that village.
Thiagarajan and his police team come to Ammapatti to arrest Manickam. What transpires later forms the crux of the story.