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E5 of 13
Series 4 - Episode 5
The Poison Sky
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Part two of two. The Sontarans activate their masterplan and begin to choke Earth, while Unit is left defenceless, with a traitor in its ranks. As interplanetary war edges closer, the Doctor considers making the ultimate sacrifice to keep Martha and Donna alive. Freema Agyeman and Christopher Ryan guest star.
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Full Episode Guide
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