After bringing the inhabitants to Eros and learning the creature's language through Boyd Allen's amazing new computer that can translate any language and imprint it into the mind, the Space Explorers find that if the creatures are not returned to their planet soon they will die. After finding of their home planet through the use of the Observatory, the two creatures are returned home. Upon arriving at their home planet, however, the Space Explorers discover a band of ruthless men that are burning their cities and capturing hundreds of the creatures. It is up to the Space Explorers to see if they can stop this ruthless band of men and return order to the once peaceful planet.