Last updated on Tuesday 21 January 2014 at 00:23 UK

Watch Doctor Who - Series 4 - Episode 5 Online Free

Doctor Who - Series 4 - Episode 5

http://www.iplaydownload.com/tv-series/?q=Doctor+Who+-+Series+4+-+Episode+5

As the Sontarans choke the Earth, the Doctor battles to keep both Martha and Donna alive.

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