Hvem er Arra? Hun er gammel - ældre end Jorden - og har en skønhed, som kun alderen kan afstedkomme. Kaptajn Koenigs møde med hende er også et møde med skæbnen. Det sker altsammen, da Månen er kommet ind på en kurs, hvor den vil støde sammen med en planet, der er flere gange så stor som den selv.
An asteroid is on a collision course with Alpha, and nuclear charges are being placed on it's surface in order to destroy it before it can collide with the Moon. Alan Carter has problems with his Eagle, which jeopardize the the timeline needed to detonate the mines at a safe distance from Alpha.
Koenig orders a delay in the countdown in order to allow Alan the chance to set his mine in place and attempt to get out of range of the blast. The asteroid is destroyed, but Main Mission cannot contact Alan through the radiation cloud that is formed by the explosion.
Unwilling to believe that Carter is dead, Koenig decides to take a rescue Eagle, equipped with an interstellar transmitter able to transmit through the radiation, to search for Alan. Without the use of instuments to locate the Eagle, the chances of finding Alan are slim.
But Koenig is given an orbital reference by a woman's voice. When he and Paul arrive, they see Alan's badly burned Eagle. Alan, who is nearly unconscious, is guided through the docking procedure by the same woman's voice. Koenig boards to check on Alan, and sees an even greater threat to Alpha.
Beyond the radiation cloud is a planet, and it is on a collision course with the Moon! They rush back to Alpha to plan their next course of action. Victor comes up with a plan to create a shockwave to redirect the Moon by placing mines between the approaching planet and Alpha.
While Alan is in Medical Centre recovering from his injuries, he has a vision of a woman, when he approaches her, she vanishes. Helena believes he is suffering from radiation sickness. Koenig decides to go back to the planet to gather data for Operation Shockwave.
As Koenig approaches the planet, he sees an enormous spacecraft. It pulls his Eagle into a hangar bay. Once inside, he leaves his ship to look around. He enters a vast chamber where he meets Arra, the Queen of Astheria, the planet on collision course with the Moon.
She tells him that their two worlds were destined to touch since the beginning of time, so that her people can mutate into a higher form of being, and that he and his people must do nothing to prevent this. He tells her that his people will not believe him. She tells him that is the challenge of command and she has faith in his ability to fulfill the part he has been destined to play.
He returns to Alpha and tells them what he has learned. Helena believes that he, too, is suffering from radiation sickness, and sedates him. She, Victor, and Paul take command and Operation Shockwave is scheduled to continue.
Arra realizes what is happening, and awakens Koenig and Carter to stop them. A fight ensues, but Operation Shock wave is stopped. As the two planets get closer, and everyone is certain of their eventual death, Koenig's faith in Arra falters. He calls out to her, looking for some sign that things will work out.
The two worlds touch briefly and Astheria disappears to everyones amazement. Despite minor damage to the base, they have survived. As Koenig reflects on the events that transpired, Helena comes to apologise for not believing him. He tells her that she did the right thing, and that if she had not acted as she did, he would have wanted to know why. After all, who could have guessed that two planets on a collision course could not collide but simply touch?
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