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It is thought that a highly advanced civilization might exist underground. To test this hypothesis, Astro and Uran set out on an underground expedition. There they get attacked by underground men.
Første luftdato : Jan 01, 1963
Sidste luftdato : Dec 31, 1966
Episode : 193 Episode
Sæson : 1 Sæson
Kørselstid: 30 minutter
Studio: Fuji TV
Land: Japan