The Gizmo Invasion was unique in space and time. Not even the dawn of the Atomic Age with its Earth satellite sequel had stirred men more profoundly, or posed a greater chal-lenge. They were spawned in a vast wilder-ness … and the war they waged against Man challenged the miracles of modern science. It was the deadliest kind of biological invasion … because the Gizmos seemed indestructible and were not even animals in a strict sense. They lived only to kill . . . . Originally published in Satellite Science Fiction digest magazine in April 1958.
