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24. Testament Of Arcadia. The Alphans land on the planet Arkadia, where glyphs suggest it is the cradle of civilisation from which life on Earth began. Now it is desolate and Koenig feels it is unsuitable for colonisation. Two renegade crew members have other ideas, however, and take Helena...

23. Dragon's Domain. Discredited eagle pilot Tony Cellini is beset by recurring nightmares in which he was the only survivor of disastrous space mission. Now the moon is approaching the same set of circumstances that Cellini encountered. A genuinely SCARY episode with an amazing monster. Kids...

22. Mission Of The Darians. The Alphans encounter a miles-long ark from the planet Daria, where the inhabitants have a very distinctive class separation. The ship has been stranded for centuries and the elite officers and the rest of the crew have gone their separate ways, and the descendants...

21. The Infernal Machine. A visiting bizarrely-constructed alien ship sends out a friendly-sounding voice invites the team of Koenig, Helena, and Victor Bergman to enter the vessel. They have been communicating with the ship itself, which insists that the Alphans send out an eagle full of...

20. Space Brain. Alien gyphs appear on all of Alpha's screens. Koenig sends an Eagle to investigate. The Eagle is lost and the pilot is taken over by a huge, alien 'Space Brain', using him as a channel to make the Alphans do its bidding. Koenig has to destroy it.

19. The Troubled Spirit. Dan Mateo, one of Alpha's botanists, believes that he can increase their food supply by communicating telepathically with his plants. After passing out during one of his electronic experiments, Alpha seems to become haunted by a murderous and disfigured spirit. This is...

18. The Last Enemy. The Alphans find themselves caught up in a long-running war between two rival planets, Betha and Delta. When a Bethan gunship, which has landed on the moon as a tactical advantage, appears to have been hit its commander Dione seeks sanctuary with the Alphans. Koenig attempts...

17. War Games. Moonbase Alpha is attacked and devastated by warships from a nearby planet. With half of its population dead Alpha can no longer survive. Commander Koenig and Dr. Russel go to the alien world to plead for the survivors, but the inhabitants wish no one to disturb their serene...

16. End Of Eternity. While exploring a cavern in an asteroid, the Alphans release Balor, a sadistic alien who has achieved immortality. Here the Alphans learn not to interfere with things they don't really know about. They believe Balor, that he is an innocent prisoner , trapped in this asteroid...

15. The Full Circle. While exploring an Earth-type world several Alphans, including Commander Koenig and Dr. Russel, disappear after sighting a strange fog. Shortly afterwards a race of primitive humans are encountered. This story I'm afraid is pretty stupid and illogical. A strange mist turns...

14. Death's Other Dominion. On the ice world of Ultima Thule the Alphans encounter members of lost earth expedition who have achieved immortality- but at a price. Dr Russell and Bergman seem to accept that immortality is indeed possible but Koenig discovers a cave that contains members of the...

13. Collision Course. After destroying an asteroid on a collision course with the moon, an even larger obstacle appears - an entire planet! On a recon mission, John Koenig encounters an inhabitant who convinces him- on the basis of faith- that the moon and the planet must collide. But no one...

12. Voyager's Return. The Alphans encounter the Voyager space probe that has been wandering the cosmos propelled by the Queller drive- a faulty engine system. Following the probe is a fleet of alien ships from a world devastated by the drive. The aliens are determined to destroy Alpha in...

11. The Last Sunset. As the Alphans are planning to explore the planet Ariel, a 'missile' attaches itself to the en route Eagle. Upon returning to Alpha, the 'missile' gives the Alphans a lunar atmosphere. But the joy at the possibility of making a new world out of the Moon is short lived, as...

10. Alpha Child. The Alphans' joy turns to horror when the first child born on the Alpha matures into a five year old in a matter of hours. This is only a prelude to the arrival of formless alien fugitives- who plan to inhabit Alpha's population.

9. Force Of Life. A wandering energy force inhabits the body of Alpha technician Anton Zoref, turning him into an energy absorbing being. Zoref under alien control ultimately heads for the nuclear power plant that if drained of energy will destroy Alpha.

8. Guardian Of Piri. Contact is made with the planet Piri, where the main computer created an idyllic life that led to extinction of its population through apathy. Now John Koenig must fight to save Alpha as his people fall under the same fate.

7. Missing Link. After attempting to investigate a nearby planet, the reconnaissance Eagle goes haywire and crashes on the moon. Two of the crew were injured; Commander Koenig lay in a coma. Meanwhile, Koenig has been brought to the planet Zenno (which was not the planet they were investigating)...

6. Another Time Another Place. An unknown space phenomenon seems to duplicate the moon (and everyone on it), then sends the doppelgänger into hyperspace. Everyone recovers except Regina Kesslann, who believes she's been living back "home" and is married to Alan Carter. In an astonishing...

5. Earthbound. A vessel of alien pacifists, bound for Earth, lands on the moon. They are greeted as friends by all- except Commissioner Simmons who sees their vessel as way to return home. The aliens offer to take one Aphan with them to Earth, Keonig asks the computer to decide who should go...