Madam X starring Rekha in double role (Madam X & Sonu) Mohiru Khan (Vijay) Raza Murad (Rai Bahadur) Shakti Kapoor (Champaklal). Parikshit Sahani (Mathur). Madam X is a criminal smuggler, she always says "Hum hai mawt ki who express duniya jise kehti hai Madam X" Inspector Vijay wants Madam X in jail & so commissioner of police Mr Mathur gives him charge. Neeta is Vijay's girlfriend, they love each other but because of his job she always feels insecured. Rai Bahadur in the biggest enemy of Madam X, Deshpande works with police and goes to meet Madam X. Vijay comes to know about this and he fits a transmitter in his house & informs the Commissioner. That night they make plan to kill Vijay. Deshpande gets greedy of money & tells champaklal to tell Madam X that he wants 50 lakhs for Vijay. Champaklal shoots Deshpande. Deshpande calls Neeta & tells her to save Vijay as Champaklal is going to kill him. She runs to save him. She comes in between & gets shot. She dies telling him that she loves him. Vijay gets hyper & kidnaps Madam X. He ties her with a thick chain so that she does not run. In anger Madam X challenges Vijay that her partner will come & release her. Vijay sees her face & remembers some, she looks exactly like her. Vijay requests her (Sonu) to help him in catching Madam X & her partner. Vijay assures her that he will take care of her family. She gets ready to help. Vijay trains her & sends her. After some days someone douts her & tells Champaklal. But Sonu cunningly convinces Champaklal to save herself from being shot. She gets scared & tells to Vijay. Sonu & Vijay loves each other. After some days Champaklal also has doubt on her & chases her, kidnaps Sonu & her family & leaves a letter for Vijay. Madam X gets released, she tells Champaklal to go & kill Rai Bahadur. Vijay gets the letter & comes to know that Mathur is Madam X's partner. Vijay with his men goes to save Sonu & family, while fighting Sonu shoots Madam X. Mathur & Champaklal also dies with her.