Hidden Danger

1. An Unearthly Child1963-11-23 2. The Cave of Skulls1963-11-30 3. The Forest of Fear1963-12-07 4. The Firemaker1963-12-14 5. The Dead Planet1963-12-21 6. The Survivors1963-12-28 7. The Escape1964-01-04 8. The Ambush1964-01-11 9. The Expedition1964-01-18 10. The Ordeal1964-01-25 11. The Rescue1964-02-01 12. The Edge of Destruction1964-02-08 13. The Brink of Disaster1964-02-15 14. The Roof of the World1964-02-22 15. The Singing Sands1964-02-29 16. Five Hundred Eyes1964-03-07 17. The Wall of Lies1964-03-14 18. Rider from Shang Tu1964-03-21 19. Mighty Kublai Khan1964-03-28 20. Assassin at Peking1964-04-04 21. The Sea of Death1964-04-11 22. The Velvet Web1964-04-18 23. The Screaming Jungle1964-04-25 24. The Snows of Terror1964-05-02 25. Sentence of Death1964-05-09 26. The Keys of Marinus1964-05-16 27. The Temple of Evil1964-05-23 28. The Warriors of Death1964-05-30 29. The Bride of Sacrifice1964-06-06 30. The Day of Darkness1964-06-13 31. Strangers in Space1964-06-20 32. The Unwilling Warriors1964-06-27 33. Hidden Danger1964-07-11 34. A Race Against Death1964-07-18 35. Kidnap1964-07-25 36. A Desperate Venture1964-08-01 37. A Land of Fear1964-08-08 38. Guests of Madame Guillotine1964-08-15 39. A Change of Identity1964-08-22 40. The Tyrant of France1964-08-29 41. A Bargain of Necessity1964-09-05 42. Prisoners of Conciergerie1964-09-12