Watch Doctor Who Season 4 Episode 5 - The Poison Sky (2)

Episode: 4×05 (Season 4 Episode 05)
Name: The Poison Sky (2)
Originally Aired: May. 03, 2008

Plot: The Sontaran fleet watch from space as the Earth is gripped in a deadly blanket of poisonous fumes. Whilst UNIT collides with Sontaran ground forces, the Doctor and a treacherous clone of Martha attempt to locate a missing TARDIS, and Donna finds herself trapped aboard the Sontaran ship itself.

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