The 39 episodes appear in their original production/shooting order, the official ITC order, and the original UK broadcast order (ATV London - Episodes 1-35: October 28th 1962 to June 23rd 1963, Episodes 36-39: October 6th-27th 1963).
See also:
Production Order Official ITC Order UK Broadcast Order 1. Planet 46 1. Planet 46 1. Planet 46 2. Hypnotic Sphere 2. Hypnotic Sphere 2. The Doomed Planet 3. Planet Of Platonia 3. Planet Of Platonia 3. Space Immigrants 4. Space Magnet 4. Space Magnet 4. Plant Man From Space 5. The Doomed Planet 5. The Doomed Planet 5. Spy In Space 6. Plant Man From Space 6. Plant Man From Space 6. The Sun Temple 7 The Sun Temple 7. The Sun Temple 7. XL5 To H2O 8. Space Immigrants 8. Space Immigrants 8. Space Pirates 9. Space Monster 9. Space Monster 9. Flying Zodiac 10. Flying Zodiac 10. Flying Zodiac 10. Space Pen 11. Spy In Space 11. XL5 To H2O 11. Space Monster 12. XL5 To H2O 12. Spy In Space 12. The Last Of The Zanadus 13. Space Pirates 13. Space Pirates 13. Planet Of Platonia 14. The Last Of The Zanadus 14. Convict In Space 14. The Triads 15 Space Pen 15. Space Pen 15. Wings Of Danger 16. Convict In Space 16. The Last Of The Zanadus 16. Convict In Space 17. Wings Of Danger 17. Wings Of Danger 17. Space Vacation 18. The Triads 18. The Triads 18. Flight To Danger 19. Sabotage 19. Sabotage 19. Prisoner On The Lost Planet 20. Prisoner On The Lost Planet 20. Prisoner On The Lost Planet 20. The Forbidden Planet 21. Flight To Danger 21. Flight To Danger 21 Robert To The Rescue 22. Space Vacation 22. Space Vacation 22. Dangerous Cargo 23. Mystery Of The TA2 23. Mystery Of The TA2 23. Mystery Of The TA2 24. Robert To The Rescue 24. Robert To The Rescue 24. Drama At Space City 25. The Forbidden Planet 25. The Forbidden Planet 25. 1875 26. The Granatoid Tanks 26 The Granatoid Tanks 26. The Granatoid Tanks 27. Dangerous Cargo 27. Dangerous Cargo 27. The Robot Freighter Mystery 28. 1875 28. 1875 28. Whistle For Danger 29. The Robot Freighter Mystery 29. The Robot Freighter Mystery 29. Trial By Robot 30. Drama At Space City 30. Drama At Space City 30. A Day In The Life Of A Space General 31. Whistle For Danger 31. Whistle For Danger 31. Invasion Earth 32. Faster Than Light 32. Faster Than Light 32. Faster Than Light 33. The Day The Earth Froze 33. The Day The Earth Froze 33. The Day The Earth Froze 34. Invasion Earth 34. Invasion Earth 34. The Fire Fighters 35 Ghosts Of Space 35 Ghosts Of Space 35. Space City Special 36. Trial By Robot 36. Trial By Robot 36. Ghosts Of Space 37. A Day In The Life Of 37. A Day In The Life Of 37. Hypnotic Sphere A Space General A Space General 38. Space City Special 38. Space City Special 38. Sabotage 39. The Fire Fighters 39. The Fire Fighters 39. Space MagnetProduction Order Notes - as detailed in the first part of "The Making Of Fireball XL5" (Fanderson FAB 13), two episodes were filmed simultaneously (1/2, 2/3, 3/4 and so on) on two separate puppet stages over a Period of ten days enabling filming of the whole series to be completed in just under six months from late 1961 to mid 1962. Directors, editors and directors of photography were assigned to the episodes on a rotational basis in accordance with the production numbers.