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Challenge of the Unknown

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Challenge of the Unknown

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Publisher: Ace Books, 1973
Series: Perry Rhodan: Book 32

1. Enterprise Stardust
2. The Radiant Dome
3. Galactic Alarm
4. Invasion from Space
5. The Vega Sector
6. The Secret of the Time Vault
7. Fortress of the Six Moons
8. The Galactic Riddle
9. Quest Through Space and Time
10. The Ghosts of Gol
11. Planet of the Dying Sun
12. The Rebels of Tuglan
13. The Immortal Unknown
14. Venus in Danger
15. Escape to Venus
16. Secret Barrier X
17. The Venus Trap
18. Menace of the Mutant Master
19. Mutants vs. Mutants
20. The Thrall of Hypno
21. The Cosmic Decoy
22. The Fleet of the Springers
23. Peril on Ice Planet
24. Infinity Flight
25. Snowman in Flames
26. Cosmic Traitor
27. Planet of the Gods
28. The Plague of Oblivion
29. A World Gone Mad
30. To Arkon!
31. Realm of the Tri-Planets
32. Challenge of the Unknown
33. The Giant's Partner
34. SOS: Spaceship Titan!
35. Beware the Microbots
36. Man and Monster
37. Epidemic Center: Aralon
38. Project: Earthsave
39. The Silence of Gom
40. Red Eye of Betelgeuse
41. The Earth Dies
42. Time's Lonely One
43. Life Hunt
44. The Pseudo One
45. Unknown Sector: Milky Way
46. Again Atlan!
47. Shadow of the Mutant Master
48. The Dead Live
49. Solar Assassins
50. Attack from the Unseen
51. Return from the Void
52. Fortress Atlantis
53. Spybot!
54. The Blue Dwarfs
55. The Micro-Techs
56. Prisoner of Time
57. A Touch of Eternity
58. The Guardians
59. Interlude on Siliko 5
60. Dimension Search
61. Death Waits in Semispace
62. The Last Days of Atlantis
63. The Tigris Leaps
64. The Ambassadors From Aurigel
65. Renegades of the Future
66. The Horror
67. Crimson Universe
68. Under the Stars of Druufon
69. The Bonds of Eternity
70. Thora's Sacrifice
71. The Atom Hell of Grautier
72. Caves of the Druufs
73. Spaceship of Ancestors
74. Checkmate: Universe
75. Planet Topide, Please Reply!
76. Recruits for Arkon
77. Conflict Center: Naator
78. Power Key
79. The Sleepers
80. The Columbus Affair
81. Pucky's Greatest Hour
82. Atlan in Danger
83. Ernst Ellert Returns!
84. Secret Mission: Moluk
85. Enemy in the Dark
86. Blazing Sun
87. The Starless Realm
88. The Mystery of the Anti
89. Power's Price
90. Unleashed Powers
91. Friend to Mankind
92. The Target Star
93. Vagabond of Space
94. Action: Division 3
95. The Plasma Monster
96. Horn: Green
97. Phantom Fleet
98. The Idol From Passa
99. The Blue System
100. Desert of Death's Domain
101. Blockade: Lepso
102. Spoor of the Antis
103. False Front
104. The Man with Two Faces
105. Wonderflower of Utik
106. Caller from Eternity
107. The Emperor and the Monster
108. Duel Under The Double Sun
109. The Stolen Spacefleet / Sgt. Robot
111. Seeds of Ruin / Planet Mechanica
113. Heritage of the Lizard People / Death's Demand
115. Saboteurs in A-1 / The Psycho Duel
117. Savior of the Empire / The Shadows Attack
Book Type: Novel
Genre: Science-Fiction
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Synopsis

ALIEN MYSTERY

Perry Rhodan is on a secret mission on a planet of Arkonide descendants. With him, on a mile-long 'liberated' space battleship is the extraordinary Pucky, and the imperious Thora.

But new mysteries arise on the planet Zalit.

The Zalites are coppery-skinned aliens with copper-green hair. Their planet has become the base of the 'Watchdogs' – telepathic, marine, methane-breathing creatures from another world who establish themselves on Zalit for unknown purposes.

What are their aims? Are they malevolent? A new and fantastic challenge for Perry Rhodan and his mutant allies…


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