Football player, Vijay Saxena, has a sweetheart in Nisha. Both decide to get married and Nisha moves in with the Saxenas, which include Vijay's two younger brothers Kamal, who is studying medicine, and Sunil, who is in college. Soon Nisha gives birth to a baby girl who they name Minnie. Tragically, Vijay loses his legs in an accident and is confined in a wheelchair, with Nisha being compelled to seek employment with Mr. Pradhan as a Personal Assistant. Kamal then announces that he wants to get married to wealthy Deepa Malhotra, but her father, who is known to Mr. Pradhan, has only one condition that Kamal move out of the Saxenas house and live with him. Kamal does so, and it is then they come to know that Malhotra had seen Nisha in compromising situations with Pradhan. When Vijay comes to know, his world gets shattered, he goes into a numb and accusatory silence. The question remains, is Nisha really having an affair with her employer?
Ram Kumar lives a wealthy lifestyle in Calcutta with his brother, Prashant and Parvati, his sister-in-law. Since his school-days he had befriended a young orphan named Laxman, who also lives with them. Years later, Ram and Laxman have grown up, and Laxman has joined the Calcutta Police Force. Impressed with Laxman's dedication and diligence, the Police Commissioner assigns him to investigate, dismantle, and arrest an underworld don called Cobra and his gang. Laxman's investigation leads him to the culprit, but before he could take any action, he is killed. Ram swears to avenge Laxman's death, and sets forth to seek Cobra. Prashant attempts to convince Ram to give this up and leave it to the police, but Ram refuses, and ends up moving out of the house. Then Ram finds out who the culprits are - none other than the Cobra gang - and sets out to avenge Laxman's death. On doing so, the gang retaliates, and Parvati is killed. It is then Ram finds out that the man called Cobra may be Prashant himself, but the question remains why would Prashant have Laxman and Parvati killed? Is he, in fact, Cobra, and if not then who is it?