Mangalsutra (1981)

Vijay lives a wealthy lifestyle with his widowed dad Mohan and has been betrothed to Gayetri Prasad since they were children. Now as adults they're attracted to each other. when they were still children. Gayetri, who lives a middle-class lifestyle with her dad Badri and mom Satyavati in Madhavpur, is soon married to Vijay, but realizes that he is an atheist, while she is a devout Hindu and worshipper of Lord Shiv, and perhaps this is why their marriage ceremony was was marred by several accidents, including Vijay being mauled by a runaway buffalo and a fire breaking out at the Mandap itself. On their wedding night, Gayetri is subjected to more shock and trauma as she gets to witness a different Vijay, someone who is lusty, and much more eager to have his way with her than to make love to her. The rest of the family find out and have Vijay examined by a doctor, who prescribes some rest, and then a discharge. However, Vijay relapses, leaving the family no alternative but to call in a Tantrik, Bajrangi Baba, as they fear he is demon-possessed. Gayetri and the rest of the family will soon find out that Vijay is indeed possessed by Kamini, a girl who he allegedly romanced during his college days in a hostel, but refused to marry, leading to her death. Now Kamini is back with a vengeance and a vow to destroy this marriage at any and all costs - even if it means killing both Gayetri and Vijay and no power on Earth can stop her.