Granted 3 wishes by a benign King of the Goblins, Goopy and Bagha can get food and clothes for the asking, hold people spellbound with their singing and drumming, and travel to any place in the twinkling of an eye by wearing magic slippers.
Married to the two daughters of the King of Shundi, Goopy and Bagha have been leading an uneventful life when they receive an invitation from the King of Hirok who is celebrating his accession to the throne.
Named after the diamond mine that is its main source of wealth, Hirok is a police state ruled by a tyrant King. A crazy inventor has just built a brainwashing machine which turns dissenters into loyal subjects by having rhymed couplets fed into their brains.
The King has also decided to close down the only school in Hirok run by an idealist teacher named Udayan. Learning helps one to distinguish between right and wrong, and this the King doesn't approve of. Sensing that he may be captured and brainwashed too, Udayan goes into hiding and plots to dethrone the King.
Singing their way around the country, Goopy and Bagha chance upon Udayan in a mountain cave. Udayan learns that Goopy and Bagha have been invited to Hirok, and tells them the real story about Hirok and its ruler. The three decide to team up and bring about the downfall of the tyrant.
The planned uprising nearly fails when Udayan is captured by the police, but Goopy and Bagha, aided by their magical music-making, finally succeed in freeing Udayan and thwarting the King. Victory is achieved by the three, aided by the peasants, the mine workers and Udayan's young pupils.
(From the official press booklet)