Checkmating Aliens

Has the corrupted alien captain coverted "Operation Earth Shield" to "Operation Kill Earth?" The Doomsday question 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 those mysterious blue-skinned species being who reveal themselves only to these homo-alien children? Will the truant captain controlling the fate of two planets win?