Air Date: May 10, 2008

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The Doctor, Donna, and Martha are drawn to a world at war. Two factions, human beings and the monstrous Hath, seek the mysterious source at the Read More

The Doctor, Donna, and Martha are drawn to a world at war. Two factions, human beings and the monstrous Hath, seek the mysterious source at the heart of their underground city. Soldiers on both sides are genetically bred for battles using genetic extrapolators, and when the Doctor is subjected to one of these devices, it produces a unique solider... and a very special girl... Read Less