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A group of six key persons are chosen to undergo an ordeal in a simulated space journey to the planet Antheon and to test their ability to cope with it. The unusual happens and the passengers meet a real alien being from outer space who obliges the greedy one of the group, Joe Dix, to push a special button to alert the authorities and put an end to the experiment.
Opening Narration: The great unknown: Limitless heavens crowded with sparking mysteries, challenging Man's curiosity. But the heavens are not oceans. Man cannot push a boat into its currents and set sail for the next horizon. The heavens are a mystery only science can solve, as it penetrates the unknown.
Closing Narration: Panic button pressed. Passengers returned. One side always in the sunlight, the other always in darkness; the known and the unknown. Frightening to each other only when they are both unknown... and misunderstood.
Captain Harvey Branson: The greatest danger? ... I don't know, there's so many. Maybe the worst are the ones who make for ourselves by seeing things that don't exist except in our own imagination.