Neeya (1979)

This fantasy horror movie delves into the dangerous sequence of events that unfold when a researcher of snakes, Kamal Haasan travels along with his group of friends: Vijayakumar, Srikanth, Jaiganesh, Ravichandran to a forest. There they come across a mysterious phenomenon of snakes (Ichadhari), with the ability to transform into humanoid form. In an unfortunate twist, one of his friend kills the beloved of the serpent, Sripriya, despite the intervention of Kamal. Initially all the other friends ignore Kamal without knowing the seriousness. They all leave the village and the female serpent (Sripriya) vows to avenge for the death of her beloved. What will happen to Kamal and his five friends? Can Kamal find a way to defeat the avenging serpent, who has magical and extraordinary powers?