Nagin 1976

A male and a female in their human forms are in love with each other. When the male turns back into a snake, he is shot by a member of a hunting party, who thought the snake was going to attack the woman. Enraged at the brutal killing of her beloved; the female snake begins to take revenge on the six involved, killing them one by one after assuming the form of a human.

Cast:

Rekha
Sunita 

Jeetendra
Nag (male serpent) 

Reena Roy
Nagin (female serpent) 

Feroz Khan
Raj 

Kabir Bedi
Uday 

Vinod Mehra
Rajesh