Rupini

The film tells a story of quadruplets, Michael, Madhanagopal, Kameshwaran, and Raju, all played by Kamal Haasan. Kamal had distinguished each of those characters with his body language and language lingo. Michael has a husky voice, Madan has an English accent, Kameshwaran speaks Palakkad Tamil and Raju speaks Madras Tamil in keeping with their diverse upbringing as per the plot.

Rajiv comes from a very wealthy family, and lives in a palatial home with his mother, who would like him to get married to a beautiful young woman named Vijaya Singh, the only daughter of Thakur Ajay Singh. But Rajiv is in love with a woman named Rajni, who is an orphan and has no family background. When Rajiv mentions this to his mother, she opposes this marriage, but relents when she meets with Rajni and sees that she is a indeed a beautiful woman. Both get married and live harmoniously for quite some time - until the arrival of Bhairo Nnath a religious man, who is capable of controlling snakes. He informs Rajiv's mom that the woman, Rajni, is a shape-shifting venomous snake who has married Rajiv to avenge the death of her spouse years ago when Rajiv was a child. What Rajiv's mom does not know that Bhairavnath has a secret agenda in entrapping Rajni, a secret This movie to be followed by a sequel called "Nigahen: Nagina Part II".

An honest police officer pays a heavy price after he gets involved with a group of criminals. Years later, his son vows to avenge his father's death.