Once upon a time, there was a kingdom called Gandhara. On the eve of a festival, its King is assassinated by his vicious sibling & chief commander, Prachanda Simha, for his urge to the throne for his idiotic son Bhajaranga. Prince Pratapa Simha is currently civilizing at the Gurukul cognizant, collapsing, and rushing to the capital. Midway, Prachanda makes a vain effort to eliminate him and is injured. Pramila, a village girl, secures him, whom he incognito and portrays as a migrant. Soon after reaching the fort, Pratap finds the murdered Chief Minister when Prachanda inflames him and counterfeits the royal patriots as traitors. In that rage, Pratap convicts the death penalty to them without trial, in which Pramila's brother is one. So, their families pledge to eradicate the royal clan and build a radical team under the leadership of Surasena.
Beware of Prachanda's satanic hue, Pratap, outbursts when the queen bars and enlightens him. Since they did not have proper armed forces, Prachanda molded the prince as a formidable foe before the public. She also shows an invisible bridge through which Pratap covertly steps out of the fort to regain people's trust. In proceedings, he is fortuitously acquainted with Pramila, learns about their secret mission, and her loathe for the prince. So, he stays a no victim of royal ruse and words to aid them timely. Following, Prachanda announces Pratap's enthronement when he plots to poison him. He tactically skips it, purports to be insane, and escapes Prachanda's surveillance. Once, the guerrillas intrude into the fort as the stage plays and are seized. Pratap shields them in the disguised form of Nallatrachu, the black cobra, becoming their command and tough nut, Prachanda.
Meanwhile, Pratap & Pramila crush when Surasena irks because he lusts for her. Besides, Prachanda hikes his barbarities on behalf of Pratap, which creates chaos in the kingdom. Exploiting it, Surasena rebels against Nallatrachu because he is avoiding his duties. Ergo, Pratap oaths to slaughter the prince, forges his death, and walks to the hideout. At the back, he smashes and bans Surasena, who is molesting Pramila. Hereupon, malevolent Surasena cabals dismantle the alliance of revolutionaries by merging with Prachanda. Pratap's mastermind arouses enmity between them and hangs Surasena. Prachanda is about to steer Bhajaranga's coronation today when the queen freaks out for justice. However, Prachanda seeks to imprison her by counting the madness. Simultaneously, Pratap onslaughts by taking the fort into his control as Nallatrachu and unveils his identity. At last, Pratap ceases Prachanda when remorseful Pramila pleads pardon. Finally, the movie ends on a happy note with the crowning ceremony and marriage of Pratap & Pramila.
