A ""project"" which is near the completion of a space ship is threatened by the invidious vanity of one of its scientists, by a sonic blast, and by the discovery of a man-made element and its strange gravitational powers. Sabotage and treason is followed by an all-out attack which brings with it the end of the world and only the take-off of the Black Planet with its human accompaniment promises survival somewhere up there.... Airborne adventure which is facile and not too frightening.