Season 4, Episode 5 - "The Poison Sky"
3 May, 2008
The Sontarans continue their evil plot and begin to "choke" the Earth. The Doctor and Donna, now teamed with Martha have to stop them, and save Earth before it is too late.
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The Sontarans continue their evil plot and begin to "choke" the Earth. The Doctor and Donna, now teamed with Martha have to stop them, and save Earth before it is too late.
