Invasion of the City Builders Part I: On a mystery planet at the edge of a distant galaxy the of the Enterprise must match wits with mammoth machines...giants of technical wizardry that stride across the terrain slowing, choking it to death with super cities. The Bridge to Catastrophe Part II: In the continuation...On Zarta, the mystery world referred to as planet of the Enterprise join forces with the last of an alien civilization to stop the terrible "progress" of the city builders!
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