"Atlantis Lost". Deucalion, son of Prometheus and Clymene, and Pyrrha, daughter of King Epimetheus and Pandora, meet on the slopes of Mount Atlas. Deucalion comforts Pyrrha after a strong earth tremor. They express mutual attraction though each is an acolyte to a holy order Prometheus intervenes to warn that their feelings may take second placed to a looming natural disaster. Pandora, in league with High Priest Phantes, is scheming to marry Pyrrha to Linos, one of the ruling Regents. Epimetheus, worried about an impeding invasion by Pelasgians plans to have himself declared a god, to enforce his authority. Atlantean blood Prince Gades, in league with the Pelasgians plans to have Epimetheus overthrown and himself installed as ruler. Learning that Pyrrha and Deucalion are in love, Phantes arrests both for sacrilege. Signs in the sky confirm fears that nature will destroy Atlantis. Prometheus, with family, Pyrrha and close associates escape on a prepared ark. As Epimetheus dies from poison during his divination and Gades appears to announce Atlantis defeated, a great tidal wave overwhelms everyone and everything. The ark sails alone on an empty ocean. Mermaids lament the passing of Atlantis.