Overview: The Thunderbirds encounter an alien monolith near Neptune, who subjects them to a trial to determine the worth of the human race.
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First Air Date: Apr 17, 1982Last Air date: Oct 15, 2008Season: 1 SeasonEpisode: 24 EpisodeRuntime: 25 minutesQuality: HDIMDb: 6.00 / 10 by 2 usersPopularity: 24.466Language: Japanese