- The Red Spot
- The Pipe-like Men
- The Coming of Greta
- In the Tower
- The Torture Chamber
- The Inquisition
- In the Power-House
- Tremendous Odds
- Into the Enclosure
- The ''Tank Scheme''
What is the mystery centered in Jupiter's famous "Red Spot"? Two fighting Earthmen, caught by the "Pipe-men" like their vanished comrades, soon find out! - Original text
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