Bombay Police are baffled by a series of crimes - all at the hands of arch-criminal "Black Cat" who leaves his calling card at every scene of the crime. The Commissioner assigns this matter to this best plainclothes agent, Rajan. Rajan's investigations lead him to suspect Professor Gupta, who is also the brother of his girlfriend, Nita. Rajan decides to use Nita's love for him, and spies on Gupta. When Nita finds out, she is enraged at Rajan, and blames the police who she feels are covering-up their inefficiency by making a scape-goat of an innocent man. Rajan fails to prove that Gupta is somehow involved with "Black Cat", and the Commissioner gives him a deadline. If Rajan does not apprehend Black Cat within that deadline, he may be suspended or even dismissed from the police force. With no clues whatsoever as to the whereabouts of Black Cat and it's gang, Rajan has the challenge of his life, which he may not be able to fulfill.

Roopa returns from England to be confronted with the dead body of her father, one of the most renowned scientists in the country. Her late father had devised a formula that enabled travel to Mars, but he is murdered for this priceless discovery and the formula falls in the hands of Dr. Sinha who plans to use it to destroy the world.

Professor, an Indian scientist, develops a nuclear project to bring world peace. When Wong and Wasco want to get their hands on the project, it is up to CID Agent Raju to save the day.

Film starring Shammi Kapoor and Shyama.

Two friends both fall in love with two girls. Their romance was to culminate in marriage, when one of girls' brother is released from jail.

Long lost siblings grow up on opposite sides of the law; the girl becomes a thief and the boy becomes a police officer.

Young Vikram (Navin Nischol) stands to inherit a fortune. After living in England for the past five years, he returns home to find his family out of control. His stepmother squanders their wealth, and his stepsister loves a hoodlum. Meanwhile, Vikram falls in love with Chanda (Rekha), a sassy village girl. He soon realizes that his family only wants his money and will stop at nothing to get it. Bollywood star Rekha makes her Hindi screen debut.

Babubhai is a notorious gangster who is threatened by Shankar Dada, another criminal, but Babubhai manages to strike a deal with him. Things take a turn when Babubhai discovers that Shankar has a twin brother who is a police officer.

Inspector Verma is shocked when he discovers that his son has turned out to be a criminal. He takes up the challenge to reform his son and make him a law-abiding citizen.

It is based on the life of Bhagat Singh. The music was composed by Prem Dhawan, with several songs being penned by freedom fighter Ram Prasad Bismil.