An alien converts a machine to save Earth from global flooding to all life forms destruction doomsday weapon.
Has the corrupted alien captain converted "Operation Earth Shield" to "Operation Kill Earth?" The Doomsday Question is confronting both: humans living on man-made islands due to water-logged Earth land erosion; and, the alien planet's rulers who had sent their navy captain on the rescue mission.
Another dilemma: what's the connection between this crisis and the alien children growing up as humans, who were secretly planted on Earth by unknown beings for reasons not yet discovered? And what about the mysterious blue-skinned species beings who reveal themselves only to these Homo-Alien children? Will the truant captain controlling the fate of the two planets win?