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?
Mala is the daughter of Kishanlal who works as a servant with a wealthy family. One day Mala meets with the owner of this family, who is so impressed with Mala that he asks for her hand in marriage for his fourth son, Gopal, which Kishanlal humbly accepts. As a result Mala gets married to Gopal, and moves in to their palatial home. While Mala is extremely helpful and sweet-natured, the rest of the daughter-in-laws, three of them, are quite the opposite. When bad times befall this family, the owner passes away; Gopal and Mala move out, leaving Gopal's mother at the mercy of her indifferent sons, Girdhar, Murli, Manohar, and their abusive wives who refuse to assist in any household work, virtually forcing their aged mother-in-law to all menial work, not looking after her needs, even when she becomes ill, and ultimately throwing her out of the house. Gopal gains popularity as a musician, while his brothers mortgage their family home with a moneylender. They decide to live off Gopal, and tell him that their mother has gone for a tirath-yatra (holy journey). With that out of the way, the brothers go back to their lifestyle, not really caring that their mother may be destitute, ill, and on the verge of dying.
This is the story of a law-abiding young man, Vikram who is studying law to protect the rights of innocents. After attaining his credentials as a lawyer, he is aghast at the way the courts release criminals, mostly due to lack of evidence, and intimidation of witnesses. He, therefore, gives up his profession and calls himself Vicky Dada, the avenger of the poor and the helpless. As his career is null and void without any future, he foregoes his love with Shyamlee, and starts to love Savitri. Shyamlee is devastated at this, and vows to find out the reason behind the change in Vikram's behaviour.