Pazu, an engineer's apprentice finds a young girl, Sheeta floating down from the sky wearing a glowing pendant. Together they discover both are searching for the legendary floating castle Laputa and vow to unravel the mystery of the luminous crystal around her neck. Their quest won't be easy however. There are air pirates, secret agents and astounding obstacles to keep them from the truth - and from each other.
Sheeta and Pazu recite the Spell of Destruction, destroying much of Laputa. The Laputa is a floating island in the sky. Pazu asks Sheeta to tell him the Spell of Destruction so they can both say it together, and reassures her that Dola and her pirates escaped. Relieved, Sheeta whispers the spell to him. Pazu tosses his canon aside and, together, they say the spell, causing the crystal to emit a blinding light. This not only blinds Muska, but also releases the Aetherium crystal holding Laputa aloft. The lower portion of the castle crumbles, taking Muska with it, and the great robots, now powerless, fall into the sea.