When the Moon comes close to the planet Arkadia, it stops moving and power begins to drop dangerously. Koenig decides to visit the planet, and takes Helena, Bergman, Alan Carter and specialists Luke Ferro and Anna Davis with him. In a cave, they find human skeletons and inscriptions on the wall which Davis and Ferro translates, and a strange story is revealed. A holocaust struck Arkadia a long, long time ago - and the survivors who migrated to another planet became the original humans of Earth! As suddenly as it began, the power loss on the Moon ceases and Koenig decides to leave the empty, but once again, habitable, Arkadia. However, Luke and Anna have fallen in love, and by tricking Koenig, remain on Arkadia to make their own Eden.
Commander Koenig writes in his journal about the recent events on the Planet Arkadia, and how they have made the Alphans reevaluate the accident that hurled the Moon into outer space, as well as their purpose in the cosmos. It started when the Moon was inexplicably pulled off course and locked dead in space above the Planet Arkadia. To add to the mystery, their power was also being drained by an unknown force. They had to go down to the lifeless planet to try to find some answers... before Alpha became unable to support life.
As they approached the planet, they could find no traces of civilization or anything capable of causing the problems faced by the Alphans. The planet was desolate, apparently devastated by some sort of holocaust. They set down to find any clues that might help them.
They could feel the almost palpable presence of the death that had visited this planet as they searched. The first clue was discovered by Anna Davis and Luke Ferro. The trees on Arkadia, though lifeless, are of the same varieties found on Earth!
The second clue was found by Helena and Victor. The planet was not completely lifeless, but locked in stasis, waiting for the bacteria that would restart the cycle of life and death. But the most startling discovery was to be found in a nearby cave... the remains of the last surviving Arkadians.
On the cave walls was an inscription in what appeared to be Sanskrit, but older. Anna, a trained philologist, attempts to translate the text. "The Testament of Arkadia" told of the destruction of the planet by the Arkadians own hands, and the few people who left taking the seeds of life to begin again in the distant regions of space. And after an indecipherable passage, an entreaty to make the planet fertile and help them live again. But all these discoveries held no answers to what was holding the Moon dead in space and draining Alpha's power.
Koenig decided to return to Alpha to begin Operation Exodus, as Alpha would soon be unable to support life. At the same time, Luke and Anna were alone in the cave and they experienced a vision. The Arkadians appeared to them, and something transpired between them without words. During the trip back to Alpha, Paul reports that the power drain has stopped at 50%.
When they returned, Anna went to the Reference Library to finish the translation of the text. At the same time, Koenig learned that they had a greater chance of survival on Alpha with a fifty percent power loss than they would have had on the planet, and decided against Operation Exodus.
Luke and Anna asked Koenig if they could have supplies to live on the planet. Koenig told them that Alpha could not survive without them in it's current condition, that it was out of the question.
Later, Luke threatened to kill Kano if he didn't give him the combination to the protien stores. He read the combination to Anna who was waiting by the secured area with a stun gun. She stunned the guards and broke in.
Luke took Helena hostage to force Koenig to let them have an Eagle and the supplies. He told Koenig that they would let her go at a designated rendezvous point in space. Alan was to follow in the unarmed survey Eagle to pick her up, and return to Alpha.
Koenig agreed, and they took off. Helena tried to reason with Luke and Anna to no avail. They claimed that it was their destiny to bring life back to Arkadia, and if the rest of the Alphans died as a result it was all part of a greater purpose.
They released Helena as agreed, and just as Koenig was about to send several armed Eagles to retrieve the stolen supplies, the Moon began to move again, and their power started to return. Koenig radioed Alan to tell him to use full power to get back to Alpha before they got left behind.
Luke and Anna watched as the Moon started to move across the Arkadian sky. When Alan and Helena returned, Helena was distressed that Luke and Anna would be left alone on Arkadia. Koenig reponded that it was their choice. But was it really?
Writing in his journal, Koenig reflects that the seeds from Earth had been returned to their place of origin. And that for them, the myth of Adam and Eve now has a new significance. And while Luke and Anna have found their new beginning, that they must have fatih and believe that for all mankind there is a purpose.
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