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Doctor Who - 4.5: The Poison Sky

io9 found this 4/21/2008 on spoilertv.blogspot.com

The Sontarans activate their masterplan and begin to choke the whole of planet Earth, as Russell T Davies's Bafta Award-winning time-travelling drama continues. UNIT is left defenceless, with a traitor in their ranks. And as interplanetary war edges closer, the Doctor has to fight to keep both Martha and Donna alive – but will he have to make the ultimate sacrifice? David Tennant plays the ...