On a distant moon of the planet Neptune, astronauts discover an unusual organic stone like structure and end up being trapped by it. The Thunderbirds are sent to Neptune to rescue the astronauts and discover that the stone is in fact an alien weapon that is ready to send a signal for an invasion fleet to attack the Earth. In a trial to determine the worthiness of the human race, the Thunderbirds must convince the device that the people of the Earth mean no harm to the aliens and that their planet is truly at peace.
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