The Doctor and Romana land on the marsh planet Delta Magna to search for another segment of the Key to Time.
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Searching for the fifth segment of the Key to Time, the tracer brings the TARDIS to treacherous swamps on the third moon of the planet Delta Magna. The Doctor and Romana soon uncover a plot to wipe out the Swampies, the local inhabitants, by the duplicitous crew of a gas refinery. Meanwhile, a massive creature is stirring beneath the waters, and the primitive Swampies believe the only way to calm the powerful monster is human sacrifice.
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