The story of 'Badle Ki Aag' begins one Deewali night...
The lamps of joy were burning in all homes. But in one home there were no lamps of joy, only the splattering of blood as the deceitful Raja Sahab of that place, greedy to swallow up all the property and wealth of his partner, went on rampage of mass-murder and wiped out the entire family.
And from this splattering of blood was born the badlekiaag, the burning desire of revenge.
Revolted by the cruelty of her husband and unable to live even a single moment under the same roof with this mass-murderer, Raja Saheb's wife Durga collected her little children and fled into the darkness, far from the sinful and blood-stained world of her husband.
And fate played a game with her.
Fate separated her form her children.
Circumstances forced two brothers into the world of Crime; it made dakus out of Shera (Dharmendra) and Lakhan (Sunil Dutt). Both were brothers, children of Durga separated in childhood, both with the same blood in their veins but unaware of each others' identities.
Shera was ruthless. He grabbed everything he coveted, as though everything belonged to him, by right. Lakhan on the other hand was a champion of the poor. He too grabbed, but in order to provide for the poor and the helpless.
Geeta (Reena Roy) had survived the mass-murder. She too grew up nursing the burning desire for revenge in her heart. In time she met and fell in love with Inspector of Police Amar (Jeetendra) son of one of the murderer. The burning desire to take revenge against the Raja Saheb and his associates for wiping out here entire family was the main force of her life-that, and her longing to find her long-lost brother Suraj, (Rajiv Anand) Suraj who loved Asha (Sakira), the sister of the two dakus, Shera and Lakhan.
Shera was crazy after Geeta and Bijli (SmitaPatil), a fiery young woman of his own band of dacoits, was crazy after Shera. Fate flung Geeta into the arms of Lakhan and Inspector Amar who loved Geeta was not far away.
Destiny, constantly at work in the lives of mere mortals, was drawing the stings tighter and tighter, bringing the main characters in this high drama of revenge closer and closer for the final confrontation.
And when the final confrontation comes the flames burn high, the guns boom loud, human passions are slaked and years of revenge are quenched for ever...
(From the official press booklet)