A BBC Classic Sci-Fi Audio Dramatization. At first, the fireballs seemed to be nothing more than a dazzling display of lights in the sky, plunging into the deepest oceans and disappearing without trace. Mike and Phyllis Watson, both radio journalists, are caught up at the center of events, well aware that it's not the cold war or international conflicts that are causing these crises, but something infinitely more deadly - an alien invasion. And whatever the alien beings are, they have begun to emerge from the sea.