A young girl is rendered homeless and helpless after her cruel relatives chase her out of her home. She finds shelter with a poor street performer who lives with his two children, a dog and a monkey.
Dr. Wilson is a humanitarian, and likes to believe that the worse part of a human can be separated and eliminated altogether, to this extent he experiments in various ways in his laboratory. One day he tries out a chemical solution on himself and lets his evil self, Blackstone, lose in bars, dark alleys, and with prostitutes. He is always able to control Blackstone, and comes home late at night to turn himself back to Dr. Wilson. Then things start to get out of control when Blackstone starts getting violent and killing people he dislikes, including Dr. Wilson; and Dr. Wilson finds Blackstone getting stronger, and out of his control, with a motive of taking over Dr. Wilson's life completely.
Kailash Sharma is found guilty of sexually molesting Shanno and killing Dheeraj Kumar Verma, and sentenced to be hanged by the Jammu & Kashmir Sessions Court. After his appeals at both High and Supreme Courts fail, he asks his wife, Seema, to take their daughter, Pinky, and re-locate elsewhere. Seema and Pinky re-locate to Bombay where she takes up sewing to make a living. She befriends their neighbor, Ratan, and both get married. 14 years later Pinky has grown up and has a boyfriend, Vikram, who she wants to marry. Meanwhile, Kailash, who is still alive as his sentence was changed to life imprisonment, arrives in Bombay to look for his family. After sometime he does find them but decides not to interfere in their lives as they appear to be happy. But when Seema finds out she goes to meet him secretly - a visit that will set off a chain of events that will end up drastically changing their lives forever.