A planet of frog-like creatures that live under water learn that Dr. Zharkov has invented a machine that would enable them to live in the air. The want the invention and kidnap Dale Arden to use as ransom. The Weapon that Walked A woman from another planet arrives on Earth my mistake. People are mysteriously turned to stone. The Witch of Neptune Zydereen, the mad witch of Neptune, hatches a plane of death to avenge her banishment.
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