Plot Summary
The scoutship Ceres is assigned to explore the Jovian moon Callisto, outermost of the four Galilean moons. Seven previous ships had landed there over a 25-year period, and never been heard from again. Two crewmen discover a stowaway in the supply room, a thirteen-year-old boy named Stanley Fields. The crew adopts the stowaway as a mascot, even fixing him up with an antiquated rubber space suit.
When the Ceres lands on Callisto, the crew find a previous scoutship, the Phobos, still intact. An inspection of the Phobos reveals it to be covered with dried slime, and the bodies of its crew are discovered. Soon a horde of four-foot-long slugs emerges from a nearby lake and approaches the Phobos. Two of the Ceres crewmen are overcome by a mysterious affliction, and a third barely makes it back to the ship. The captain of the Ceres realizes that the slugs are using magnetic fields to stun the crewmen, amplified by their steel space suits. Fields volunteers to retrieve the unconscious crewmen in his rubber space suit. He brings the first back, but while retrieving the second he falls victim to an air leak and barely makes it back to the ship. Fields and the unconscious crewmen all survive, and Ceres safely departs Callisto.
Read more about this topic: The Callistan Menace
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