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The Third planet was a man-made planet used as a base by the Shadow in his mission to gain the sixth segment of the Key to Time.
File:Geez, sue the designer.jpg
The Third planet. (DW: The Armageddon Factor)
He positioned it between the planets Zeos and Atrios so neither could be seen from the other.
It was destroyed when the Doctor rerouted missiles fired by the Marshal of Atrios's Command Capsule into it. (DW: The Armageddon Factor)