An undercover cop finds himself in a Catch-22 situation where he has to return the drugs he had stolen from a kingpin in exchange for his son. The bag containing the drug goes missing, and with both gangsters and cops on his tail, can he get out of this mess?
Babu and Vimala are lovers. However, under a circumstance Babu is forced to get married with dying Gowri without the acknowledgement of Vimala. Vimala and Gowri are friends. Shocked by the fact her lover get married to Gowri, Vimala and Babu tried to keep their past as a secret from Gowri.
Meena (Devika), a young woman, escapes from the clutches of a womanizing Zamindar. She attempts suicide and is saved by an elderly couple, who adopt her. They wish her to wed their nephew (S. S. Rajendran) and the wedding is arranged. But, during the ceremony, another man (R. S. Manohar) shows up claiming Meena to be his wife. She is arrested for the attempted murder of the Zamindar. But, she say she doesn't him. Her adoptive brother (Muthuraman) and a friend (T. R. Ramachandran) try to solve the mystery. Meena runs away from the family to relieve them of the anguish she has caused them and they later find her as a stage/playback singer calling herself as Kausalya Devi. But Kausalya Devi claims she has never seen them before. How do they resolve the mystery forms rest of the story.
Baby Mala, was abandoned in a forest .Mala is looked after by a tribal couple and an elephant. They girl grows up as Nalini. The elephant becomes her companion.
An Andaman tribal who escapes from men trying to capture his people, ends up in the care of a spoilt, rich girl, who starts to fall in love with him.
In the past, Jeevadurai (Jaiganesh), an honest police officer, was killed by Govindan (Vijayakumar). Thereafter, Rajaratnam (Sathyaraj), Jeevadurai's son, was brought by D.I.G Pandidurai (Sivaji Ganesan). Few years later, Rajaratnam is married to Devaki (Rupini) and they have a son. Like his father, Rajaratnam becomes a police officer. In Shanthi Nagar, Govindan who is now known as Kocha controls the city and the people cannot face him and his henchmen. His adopted father Pandidurai transfers Rajaratnam to Shanthi Nagar.