Season 4, Episode 5 The Poison Sky

First Aired: May 30, 2008

Poisonous gas threatens the people of Earth as the Sontarans attempt to convert the planet's atmosphere to suit their needs. Martha Jones: Freema Agyeman.

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  • Premiered: March 26, 2005
  • Rating: TV-PG
  • User Rating:4.74 out of 5 (160 ratings)
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  • Premise: Following the adventures of a time-traveling alien called "The Doctor" and his human companions as they deal with crises set on Earth and other worlds. (more)

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