Bhagat Singh was born in British India in 1907. As a child he witnessed numerous atrocities committed on fellow Indians by their British rulers, who came to trade under the guise of the East India Company, but ended up controlling most of the nation, and permitting tyrants such as General Reginald Dyer to massacre thousands of innocent men, women and children in Jallianwala Bagh. As a child he was impressed by Mahatma Gandhi, especially his call to launch the non-cooperation movement, which led to thousands of people burning British-made clothing, giving up school, college studies, and government jobs — only to be let down by Gandhi when he called off the movement. Undaunted, Bhagat Singh (Ajay Devgan) decided to be a revolutionary, starting with getting into petty fights, then as a grown-up joining the Hindustan Republic Association. His father, Kishan, paid Rs.60,000/- and bailed him out, so that he could get him to run a dairy-farm and get married to a girl named Mannavali (Amrita Rao) .
When Lala Lajpat Rai was beaten to death by the police, Bhagat, with Shivaram Rajguru, Sukhdev, and others daringly carried out the assassination of a police officer named Saunders, which eventually led to Bhagat's arrest. He was lodged in a cell, tortured and beaten mercilessly. But being a revolutionary was in Bhagat's blood: When the British proposed the Trade Disputes and Public Safety Bills, he initiated the bombing in the Indian Parliament Building, with Batukeshwar Dutt, He took utmost care of the safety of people in parliament by throwing bombs at empty benches .He was arrested, and tried in an open court. This is where Bhagat launched his much-publicized revolution, and became popular with the masses, especially the younger generation, laborers, and farmers, so much so that his popularity rivaled that of Gandhi himself.
Even in Lahore prison, Bhagat made headline news when he and other prisoners undertook a 63-day fast unto death to improve the conditions of Indian freedom-fighter prisoners. Then the British re-opened the Saunders' murder case, which led to death sentences being imposed on Bhagat, Shivram, and Sukhdev. The entire nation rose up in protest, including the Congress party — with the ball in Gandhi's court — for he was due to sign the Irwin Pact, and Indians hoped that he would use this as a bargaining chip to save the lives of the heroic trio.