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
LibriVox recordings are public domain in the United States; copyright status may differ elsewhere.
Chapters
- Chapter 1
Part I
19:32 - Chapter 2
Part II
25:36 - Chapter 3
Part III
26:36 - Chapter 4
Part IV
16:01 - Chapter 5
Part V
26:05