The X-87 was a red shambles. It roared the starways, a renegade Venusian at the controls, a swaggering Martian plotting the space-course. And in an alumite cage, deep below-decks, lay Penelle, crack Shadow Squadman—holding the fate of three worlds in his manacled hands. – Summary by Original Gutenberg text
Never had the mind of man conceived so horrible a doom as was reaching for Earth. Never had a greater need for Earth’s valiant champions been needed. And yet the only ones who could fight the menace—were five futile humans, prisoners on another world. – Summary by Original Gutenberg text