The Sultan of the Golden City dies, and unexpectedly names his younger son, Karim, as his successor. Enraged by this, Karim's power-hungry older brother, Shazaman, and his wife, the evil witch Dunyazada, devise a cunning plan: they use a magical potion to transform the new Sultan, Karim, into a huge hairy monster, and then claim that this beast has devoured the Sultan and must be destroyed.