Chandu consults his crystal ball and sees that Nadji, Princess of Egypt, is in danger. She is about to be sacrificed by the black magic cult of Ubasti. Headed for the magic island of Lemuria, he is shipwrecked , washed ashore and captured. He becomes invisible, escapes and after numerous detours is able to rescue the princess.

Chandu consulta sua bola de cristal e vê que Nadji, princesa do Egito, está em perigo. Ela está prestes a ser sacrificada pelo culto de magia negra de Ubasti. Chadu entçao, vai a ilha mágica de Lemúria para resgatar a princessa